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Home My WebLink AboutWPO201800020 Calculations 2019-05-07Keswick Hall Additions and Site Improvements COUNTY OF ALBEMARLE, VIRGINIA MINOR SITE PLAN AMENDMENT DESIGN CALCULATIONS & NARRATIVE APRIL 29, 2019 Prepared by: Craig Kotarski, PE Timmons Group 608 Preston Ave Suite 200 Charlottesville, VA 22903 434.295.5624 Table of Contents Section Title 1 Project Narrative 2 LD 229 – Storm Sewer Design Computations 3 LD 204 – Storm Inlet Design Computations 4 LD 347 – Hydraulic Grade Line Analysis 5 Virginia Runoff Reduction Method Worksheet Summary 6 Pre-Developed HydroCAD Calculations 7 Post-Developed HydroCAD Calculations 8 Nutrient Credit Availability Letter Project Narrative: This project includes the demolition of existing structures, the renovation of the existing hotel building, construction of additional parking spaces, buildings and associated utilities. Limits of clearing and grading area is 9.95 acres. Water Quality Compliance: The disturbed area of 9.68 acres was used for the water quality analysis. In the proposed condition there will be 4.84 acres of managed turf and 4.84 acres of impervious cover. Per the Virginia Runoff Reduction Spreadsheet, this will require that 1.37 lbs. of phosphorus be removed per year. This removal is being achieved through the use of surplus credits produce from plan titled “Keswick Hall Central Energy Plant Demolition and Renovation”, the installation of permeable pavement and purchase of stormwater nutrient credits. Water Quantity Compliance: This site consists of five (5) major drainage areas that were analyzed for this project. Stormwater runoff draining to analysis point 1 will utilize bioretention facility 4 and the existing bioretention facility 1, to be constructed as part of the plans titled "Keswick Hall Central Energy Plant Demolition and Renovation". Bioretention facility 1 has been designed to treat additional drainage area as proposed in this plan for stormwater quantity purposes only. Energy balance and channel protection requirements are met through the use of bioretention facility 4 and existing bioretention facility 1. Stormwater runoff draining to analysis point 2 will utilize a CMP detention pipe to meet energy balance and channel protection requirements. Analysis point 2 consists of several sub-drainage areas with varying time of concentrations. Area 2-4 drains to the east and ultimately reaches the northern most ponds located within the golf course. This pond outfalls to the existing pond to the south, associated with analysis point 2 as seen on sheet C6.0. Stormwater runoff to analysis point 3 (golf course) sheet flows from the proposed limits of disturbance onto the golf course. Stormwater quantity requirements for analysis point 3 will be met through the reduction in impervious area. Energy balance and channel protection for this analysis point are in compliance. Stormwater runoff draining to analysis point 4 will utilize a combination of permeable pavement, bioretention facilities and a CMP detention pipe to meet energy balance and channel protection requirements. A portion of the permeable pavement will utilize underdrains to convey stormwater directly into bioretention facilities 2 & 3. Both of these bioretention facilities will direct large rain events into the CMP detention pipe shown on sheet C6.2. The remaining area of permeable pavement will direct stormwater runoff into the CMP detention pipe. Stormwater runoff draining to analysis point 5 consists of two separate sub drainage areas (post 5-1 & post 5-2) that meet at the existing pond on the western side of the property. Improvements in these areas reduce the overall drainage area to analysis point 5 and meet energy balance and channel protection requirements without the need of any additional infrastructure. LD-229PROJECT:Keswick Hall AdditionsDesigned by: AASTORM SEWER DESIGN COMPUTATIONSLOCATION:COUNTY: CharlottesvilleChecked by:STORM FREQUENCY10NOAA STATION:UNITSENGLISHDRAIN. RUNOFF CA TOTAL RAIN RUNOFF INVERT ELEVATIONS LENGTH SLOPE SIZE SHAPE Number Capacity Friction NORMAL FLOW FLOWPIPE FROM POINT TO POINT AREA COEFF. INCRE- ACCUM- INLET FALL Lateral Total Q UPPER LOWER of Pipe (Dia. Or of Pipes Slope Depth of Area of Hrn Vn En TIMENO. REFERENCE STA. REFERENCE STA. "A" "C" MENT ULATED TIMEEND END Span/Rise)Flow, dn Flow, An REMARKSAcre Minutes In/Hr CFS CFS Ft. Ft./Ft. In. CFS Ft./Ft. Ft. SqFt Ft. Ft/Sec Ft. Sec.(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15)(16) (17) (18)101 102 1000.00 0.00 0.46 5.46 6.40 0.00 8.46 439.01 438.75 16.06 0.01619 24Circular1 31.18 0.00120 0.71 1.00 0.39 8.44 1.82 1.90103 102A 1020.00 0.00 0.46 5.27 6.45 0.00 8.46 439.44 439.11 60.18 0.00548 24Circular1 18.14 0.00120 0.96 1.49 0.49 5.67 1.46 10.61103A SWM2-OUT 102A0.00 0.00 0.00 5.00 0.00 5.52 440.00 439.54 83.49 0.00551 18Circular1 8.45 0.00250 0.88 1.08 0.41 5.10 1.29 16.39105 106 SWM2-IN0.00 0.00 0.17 5.65 6.33 0.00 4.47 443.06 442.58 31.99 0.01500 15Circular1 8.57 0.00430 0.64 0.63 0.32 7.06 1.42 4.53107 108 1060.00 0.00 0.00 5.00 0.00 0.00 0.92 444.25 443.26 66.27 0.01494 15Circular1 8.55 0.00020 0.28 0.20 0.17 4.56 0.60 14.55109 110 1060.00 0.00 0.00 5.00 0.00 0.00 3.45 451.25 448.12 62.52 0.05006 15Circular1 15.66 0.00250 0.40 0.34 0.23 10.24 2.03 6.11129 130 SWM2-IN0.00 0.00 0.19 5.10 6.51 0.00 1.26 444.37 443.25 29.87 0.03750 12Circular1 7.47 0.00110 0.28 0.18 0.16 7.09 1.06 4.22131 132 1300.23 0.84 0.19 0.19 5.00 6.54 0.00 1.26 445.17 444.47 33.34 0.02100 12Circular1 5.59 0.00110 0.32 0.22 0.18 5.76 0.84 5.79141 142 102A0.57 0.80 0.46 0.46 5.00 6.54 0.00 2.98 439.84 439.59 32.67 0.00765 12Circular1 3.38 0.00620 0.73 0.62 0.30 4.85 1.10 6.73151 152 SWM2-IN0.32 0.84 0.27 0.27 5.00 6.54 0.00 1.76 441.01 440.75 26.18 0.00993 12Circular1 3.85 0.00220 0.48 0.37 0.24 4.79 0.83 5.47207 208 2060.18 0.67 0.12 0.25 6.03 6.22 0.00 1.55 434.28 431.49 139.45 0.02001 12Circular1 5.46 0.00170 0.36 0.26 0.20 5.98 0.92 23.31209 210 2080.26 0.40 0.10 0.12 5.80 6.29 0.00 0.79 443.15 434.38 109.66 0.07997 15Circular1 19.79 0.00010 0.17 0.10 0.11 7.87 1.13 13.93211 212 2100.00 0.00 0.02 5.58 6.36 0.00 0.13 447.92 443.25 58.37 0.08001 12Circular1 10.92 0.00000 0.08 0.03 0.05 4.74 0.43 12.33213 214 2120.00 0.00 0.02 5.28 6.45 0.00 0.13 456.87 451.01 73.23 0.08002 12Circular1 10.92 0.00000 0.08 0.03 0.05 4.74 0.43 15.46215 216 2140.03 0.67 0.02 0.02 5.00 6.54 0.00 0.13 460.10 458.42 55.96 0.03002 12Circular1 6.69 0.00000 0.10 0.04 0.06 3.37 0.27 16.62303 304 EX.3020.00 0.00 0.07 5.69 6.32 0.00 8.70 431.57 428.00 31.61 0.11294 18Circular1 38.24 0.00610 0.49 0.50 0.27 17.52 5.25 1.80305 306 3040.00 0.00 0.07 5.48 6.39 0.00 8.70 438.79 432.88 147.81 0.03998 18Circular1 22.75 0.00610 0.64 0.72 0.34 12.01 2.89 12.30307 308 3060.00 0.00 0.00 5.19 6.48 0.00 8.29 442.06 440.90 46.52 0.02494 18Circular1 17.97 0.00550 0.72 0.83 0.36 9.96 2.26 4.67309 310 3080.00 0.00 0.00 5.00 0.00 0.00 8.29 442.50 442.16 62.09 0.00548 18Circular1 8.42 0.00550 1.21 1.53 0.46 5.43 1.67 11.43313 314 3120.00 0.00 0.44 6.71 6.03 0.00 2.63 447.86 447.80 11.40 0.00526 15Circular1 5.08 0.00150 0.64 0.63 0.32 4.17 0.91 2.73315 316 3140.00 0.00 0.43 6.38 6.12 0.00 2.62 448.14 447.96 36.07 0.00499 15Circular1 4.94 0.00150 0.65 0.64 0.32 4.09 0.91 8.82317 318 3160.00 0.00 0.18 6.26 6.16 0.00 1.10 450.14 448.24 50.22 0.03783 12Circular1 7.51 0.00080 0.26 0.16 0.15 6.83 0.98 7.36319 320 3180.02 0.60 0.01 0.08 5.64 6.34 0.00 0.49 456.56 450.24 191.79 0.03295 12Circular1 7.01 0.00020 0.18 0.10 0.11 5.15 0.59 37.25321 322 3160.02 0.35 0.01 0.22 5.73 6.31 0.00 1.41 448.42 448.24 35.58 0.00506 12Circular1 2.75 0.00140 0.51 0.40 0.25 3.52 0.70 10.10323 324 3220.21 0.90 0.19 0.19 5.00 6.54 0.00 1.24 449.15 448.52 94.32 0.00668 12Circular1 2.91 0.00130 0.46 0.35 0.24 3.56 0.65 26.52325 326 3220.05 0.44 0.02 0.02 5.00 6.54 0.00 0.14 449.22 448.52 93.39 0.00750 12Circular1 3.34 0.00000 0.14 0.07 0.09 2.13 0.21 43.84329 330 3160.06 0.52 0.03 0.03 5.00 6.54 0.00 0.20 448.70 448.24 52.52 0.00876 12Circular1 3.61 0.00000 0.16 0.08 0.10 2.49 0.26 21.10331 332 3200.01 0.67 0.00 0.06 5.48 6.39 0.00 0.37 457.63 456.76 38.58 0.02255 12Circular1 5.80 0.00010 0.17 0.09 0.10 4.13 0.44 9.35333 334 3320.06 0.53 0.03 0.05 5.22 6.47 0.00 0.34 459.16 457.83 64.70 0.02056 8Circular1 1.88 0.00070 0.19 0.08 0.11 4.09 0.45 15.82335 Trench Drain 3340.03 0.68 0.02 0.02 5.00 6.54 0.00 0.13 462.16 461.18 44.48 0.02203 4Circular1 0.31 0.00440 0.15 0.04 0.08 3.40 0.33 13.08337 338 3180.14 0.73 0.10 0.10 5.00 6.54 0.00 0.67 450.44 450.24 40.62 0.00492 12Circular1 2.71 0.00030 0.34 0.23 0.19 2.86 0.47 14.22339 340 3200.01 0.80 0.01 0.01 5.00 6.54 0.00 0.05 459.32 458.55 40.51 0.01901 10Circular1 3.27 0.00000 0.07 0.02 0.05 2.24 0.15 18.06343 344 3060.12 0.55 0.07 0.07 5.00 5.04 0.00 0.33 440.50 440.16 68.13 0.00499 12Circular1 2.73 0.00010 0.24 0.14 0.14 2.36 0.32 28.91401 402 4000.32 0.50 0.16 0.16 5.04 6.53 0.00 11.72 415.79 415.69 7.68 0.01302 18Circular1 12.99 0.01100 1.12 1.41 0.45 8.32 2.19 0.92403 SWM1-OUT 4020.00 0.00 0.00 5.00 0.00 10.67 416.50 415.89 26.02 0.02344 15Circular1 10.71 0.02430 1.02 1.07 0.38 9.95 2.56 2.61405 406 SWM1-IN0.00 0.00 1.14 7.68 5.78 0.00 6.60 421.95 420.00 35.37 0.05513 15Circular1 16.43 0.00930 0.55 0.52 0.29 12.66 3.04 2.80407 408 4060.11 0.90 0.10 0.96 7.61 5.79 0.00 5.60 427.50 426.21 42.24 0.03054 15Circular1 12.23 0.00670 0.59 0.58 0.30 9.75 2.07 4.33409 410 4080.00 0.00 0.87 7.53 5.81 0.00 5.03 434.26 427.60 69.88 0.09531 15Circular1 21.61 0.00540 0.41 0.35 0.23 14.34 3.61 4.87411 412 4100.00 0.00 0.44 7.43 5.84 0.00 2.72 438.98 434.36 66.06 0.06994 12Circular1 10.21 0.00520 0.35 0.25 0.19 10.99 2.23 6.01 LD-229PROJECT:Keswick Hall AdditionsDesigned by: AASTORM SEWER DESIGN COMPUTATIONSLOCATION:COUNTY: CharlottesvilleChecked by:STORM FREQUENCY10NOAA STATION:UNITSENGLISHDRAIN. RUNOFF CA TOTAL RAIN RUNOFF INVERT ELEVATIONS LENGTH SLOPE SIZE SHAPE Number Capacity Friction NORMAL FLOW FLOWPIPE FROM POINT TO POINT AREA COEFF. INCRE- ACCUM- INLET FALL Lateral Total Q UPPER LOWER of Pipe (Dia. Or of Pipes Slope Depth of Area of Hrn Vn En TIMENO. REFERENCE STA. REFERENCE STA. "A" "C" MENT ULATED TIMEEND END Span/Rise)Flow, dn Flow, An REMARKSAcre Minutes In/Hr CFS CFS Ft. Ft./Ft. In. CFS Ft./Ft. Ft. SqFt Ft. Ft/Sec Ft. Sec.(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15)(16) (17) (18)413 412A 4120.00 0.00 0.44 7.36 5.86 0.00 2.72 442.39 439.08 47.33 0.06993 12Circular1 10.21 0.00520 0.35 0.25 0.19 10.99 2.23 4.31413A 414 412A0.20 0.55 0.11 0.44 6.99 5.95 0.00 2.72 443.66 442.49 116.66 0.01003 12Circular1 3.87 0.00520 0.62 0.51 0.28 5.33 1.06 21.88415 414A 4140.14 0.55 0.08 0.33 6.73 6.02 0.00 2.06 444.45 443.76 75.65 0.00912 12Circular1 3.69 0.00300 0.53 0.43 0.26 4.83 0.90 15.68415A 418 414A0.00 0.00 0.26 6.42 6.11 0.00 1.60 446.09 444.55 102.39 0.01504 12Circular1 4.73 0.00180 0.40 0.29 0.21 5.44 0.86 18.82419 420 4180.18 0.90 0.16 0.26 6.22 6.17 0.00 1.60 446.57 446.19 51.04 0.00745 12Circular1 3.33 0.00180 0.49 0.38 0.25 4.20 0.76 12.16423 424 4200.01 0.90 0.01 0.09 5.77 6.30 0.00 0.60 447.32 446.67 87.07 0.00747 10Circular1 2.05 0.00070 0.31 0.18 0.17 3.27 0.47 26.66423A 424B 4240.01 0.90 0.01 0.09 5.62 6.35 0.00 0.54 447.64 447.42 29.54 0.00745 10Circular1 2.05 0.00050 0.29 0.17 0.16 3.17 0.45 9.31423B 424A 424B0.01 0.90 0.01 0.08 5.54 6.37 0.00 0.48 447.85 447.74 14.02 0.00785 10Circular1 2.10 0.00040 0.27 0.15 0.15 3.14 0.42 4.47425 426 4060.07 0.50 0.04 0.17 5.41 6.41 0.00 1.11 428.35 426.65 33.94 0.05009 10Circular1 5.31 0.00230 0.26 0.14 0.15 7.71 1.18 4.40427 428 4260.17 0.70 0.12 0.14 5.33 6.44 0.00 0.89 429.64 428.43 32.21 0.03757 10Circular1 4.60 0.00150 0.25 0.14 0.14 6.53 0.91 4.94427A 428A 4280.05 0.36 0.02 0.02 5.00 6.54 0.00 0.12 431.15 430.00 57.65 0.01995 10Circular1 3.35 0.00000 0.11 0.04 0.07 2.90 0.24 19.88431 432 4100.03 0.37 0.01 0.42 5.41 6.41 0.00 2.73 438.22 435.53 41.42 0.06494 12Circular1 9.84 0.00520 0.36 0.26 0.20 10.72 2.15 3.86433 434 4320.01 0.35 0.00 0.41 5.36 6.43 0.00 2.66 440.36 438.32 31.36 0.06505 12Circular1 9.84 0.00500 0.36 0.25 0.20 10.65 2.12 2.95434A 435A 4340.12 0.89 0.11 0.40 5.18 6.48 0.00 2.62 444.94 444.78 7.99 0.02003 12Circular1 5.46 0.00480 0.49 0.38 0.25 6.88 1.22 1.16435 436 435A0.11 0.90 0.10 0.10 5.00 6.54 0.00 0.65 451.63 450.29 29.86 0.04488 8Circular1 2.77 0.00260 0.22 0.10 0.12 6.49 0.87 4.60447 448 4120.06 0.80 0.05 0.05 5.00 6.54 0.00 0.31 443.14 440.55 22.36 0.11583 8Circular1 4.46 0.00060 0.12 0.04 0.07 7.38 0.96 3.03449 450 435A0.22 0.90 0.20 0.20 5.00 6.54 0.00 1.30 445.36 445.04 42.87 0.00746 10Circular1 2.05 0.00310 0.48 0.33 0.23 3.98 0.73 10.78451 452 4140.22 0.90 0.20 0.20 5.00 6.54 0.00 1.30 447.93 447.30 63.30 0.00995 8Circular1 1.31 0.01030 0.54 0.30 0.20 4.27 0.82 14.83453 454 424A0.03 0.90 0.03 0.03 5.00 5.04 0.00 0.14 449.50 449.40 10.38 0.00963 4Circular1 0.20 0.00460 0.20 0.05 0.09 2.50 0.30 4.15463 464 4340.01 0.40 0.00 0.00 5.00 6.54 0.00 0.03 444.26 443.93 32.85 0.01005 8Circular1 1.31 0.00000 0.06 0.02 0.04 1.52 0.10 21.57503 504 SWM1-IN0.11 0.90 0.10 0.24 5.87 6.27 0.00 2.13 426.00 419.65 45.40 0.13987 12Circular1 14.44 0.00320 0.26 0.16 0.15 13.16 2.95 3.45503A 504A 5040.01 0.50 0.01 0.14 5.82 6.29 0.00 1.51 429.19 426.10 30.87 0.10010 12Circular1 12.21 0.00160 0.24 0.14 0.14 10.58 1.98 2.92505 506 504A0.03 0.80 0.02 0.04 5.52 6.38 0.00 0.86 429.66 429.31 44.06 0.00794 12Circular1 3.44 0.00050 0.34 0.24 0.19 3.64 0.55 12.10507 508 5060.11 0.90 0.10 0.10 5.00 6.54 0.00 0.65 435.50 433.21 68.55 0.03341 12Circular1 7.06 0.00030 0.21 0.12 0.12 5.61 0.69 12.23509 NGW_1 504A0.11 0.90 0.10 0.10 5.00 6.54 0.00 0.65 435.00 432.58 28.46 0.08503 8Circular1 3.82 0.00260 0.19 0.08 0.11 8.16 1.22 3.49511 512 5060.01 0.90 0.01 0.01 5.00 6.54 0.00 0.06 430.55 430.06 49.02 0.01000 6Circular1 0.61 0.00010 0.10 0.03 0.06 1.99 0.17 24.70701 702 1060.00 0.00 0.20 5.48 6.39 0.00 1.30 449.07 448.16 45.66 0.01993 12Circular1 5.45 0.00120 0.33 0.23 0.19 5.69 0.83 8.03703 704 7020.00 0.00 0.20 5.31 6.44 0.00 1.30 450.34 449.17 58.73 0.01992 12Circular1 5.45 0.00120 0.33 0.23 0.19 5.69 0.83 10.33705 706 7040.03 0.83 0.03 0.20 5.11 6.51 0.00 1.30 449.86 449.32 53.62 0.01007 12Circular1 3.87 0.00120 0.40 0.29 0.21 4.44 0.70 12.07707 708 7060.16 0.82 0.13 0.13 5.00 7.48 0.00 1.08 452.45 451.77 45.32 0.01500 12Circular1 4.73 0.00080 0.32 0.22 0.18 4.88 0.69 9.29801 802 8000.08 0.90 0.07 0.19 5.75 6.31 0.00 1.18 425.55 425.48 13.59 0.00515 12Circular1 2.77 0.00100 0.46 0.35 0.24 3.39 0.63 4.01803 804 8020.21 0.35 0.07 0.11 5.45 6.40 0.00 0.73 425.91 425.65 51.90 0.00501 12Circular1 2.73 0.00040 0.35 0.25 0.19 2.95 0.49 17.62805 806 8040.11 0.36 0.04 0.04 5.00 6.54 0.00 0.26 426.31 426.01 59.62 0.00503 12Circular1 2.74 0.00000 0.21 0.12 0.12 2.19 0.28 27.25809 808A 8080.00 0.00 0.24 5.49 4.92 0.00 1.17 422.74 422.56 33.55 0.00537 15Circular1 5.13 0.00030 0.41 0.35 0.23 3.39 0.58 9.91809A 810 808A0.47 0.35 0.17 0.17 5.00 5.04 0.00 0.83 423.15 422.84 55.89 0.00555 15Circular1 5.21 0.00010 0.34 0.27 0.20 3.11 0.49 17.96811 812 808A0.20 0.35 0.07 0.07 5.00 5.04 0.00 0.35 423.19 422.84 70.10 0.00499 12Circular1 2.73 0.00010 0.24 0.15 0.14 2.40 0.33 29.24EX15-RCP STORM GRATE 4000.00 0.00 0.25 6.70 6.03 0.00 1.55 426.74 415.58 120.17 0.09287 15Circular1 19.69 0.00060 0.24 0.16 0.14 9.56 1.66 12.57EX15-RCP2 400 STORM GRATE 20.00 0.00 0.41 6.91 5.97 0.00 12.89 415.58 404.69 117.36 0.09279 15Circular1 19.68 0.04150 0.74 0.75 0.34 17.10 5.28 6.86EX18-RCP 206 STORM GRATE0.00 0.00 0.25 6.42 6.11 0.00 1.55 429.37 427.02 98.35 0.02389 18Circular1 16.24 0.00020 0.31 0.27 0.19 5.79 0.83 16.98 LD-229PROJECT:Keswick Hall AdditionsDesigned by: AASTORM SEWER DESIGN COMPUTATIONSLOCATION:COUNTY: CharlottesvilleChecked by:STORM FREQUENCY10NOAA STATION:UNITSENGLISHDRAIN. RUNOFF CA TOTAL RAIN RUNOFF INVERT ELEVATIONS LENGTH SLOPE SIZE SHAPE Number Capacity Friction NORMAL FLOW FLOWPIPE FROM POINT TO POINT AREA COEFF. INCRE- ACCUM- INLET FALL Lateral Total Q UPPER LOWER of Pipe (Dia. Or of Pipes Slope Depth of Area of Hrn Vn En TIMENO. REFERENCE STA. REFERENCE STA. "A" "C" MENT ULATED TIMEEND END Span/Rise)Flow, dn Flow, An REMARKSAcre Minutes In/Hr CFS CFS Ft. Ft./Ft. In. CFS Ft./Ft. Ft. SqFt Ft. Ft/Sec Ft. Sec.(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15)(16) (17) (18)P1 P2 424A0.01 1.00 0.01 0.04 5.25 6.46 0.00 0.26 448.32 447.95 47.13 0.00785 6Circular1 0.54 0.00190 0.24 0.10 0.12 2.72 0.36 17.32P3 P4 P20.01 1.00 0.01 0.01 5.00 6.54 0.00 0.07 448.49 448.32 16.97 0.01002 6Circular1 0.61 0.00010 0.11 0.03 0.07 2.04 0.17 8.32P5 P6 P20.01 1.00 0.01 0.02 5.14 6.50 0.00 0.13 448.49 448.32 16.97 0.01002 6Circular1 0.61 0.00050 0.16 0.05 0.09 2.48 0.25 6.85P7 P8 P60.01 1.00 0.01 0.01 5.00 6.54 0.00 0.07 448.66 448.49 16.97 0.01002 6Circular1 0.61 0.00010 0.11 0.03 0.07 2.04 0.17 8.32 FORM LD 204STORMWATER INLET COMPUTATIONSSHEET 1 OF 5ROUTEClub DrivePROJECTKeswick Hall Additions and RenovationsDESIGNER:AADATE4/16/2019CHECKED:UNITSENGLISHINLETSag Inlets OnlyNUMBERTYPELENGTH (FT; M)STATIONDRAINAGE AREA (AC; HA)CCASCAI (IN/HR; mm/HR)Q INCR. (CFS; CMS)Qc CARRYOVER (CFS; CMS)QT GUTTER FLOW (CFS; CMS)S GUTTER SLOPE (FT/FT; M/M)Sx CROSS SLOPE (FT/FT; M/M)T (SPREAD) (FT; M)W (GUTTER WIDTH) (FT; M)W/TSw (GUTTER SLOPE) (FT/FT; M/M)Sw/SxEo (App. 9C-8)a S'wSeCOMPUTED LENGTH LT (FT; M)L, SPECIFIED LENGTH (FT; M)L/LT E (App. 9C-18)Q INTERCEPTED (CFS; CMS) or d/hQb CARRYOVER (CFS; CMS)Depth at Curb (IN; MM)Allowable Ponding Depth d (FT; M)Height of Curb Opening h (FT; M)d/hDepth at Inlet (IN; MM) T SPREAD @ SAG (FT; M)REMARKS132 DI-1 2.000 0.230 0.84 0.19320'RIGHT 0.193 4 0.772 0 0.772 0.0100 0.0500 3.015 2.000 0.6633 0.0833 1.666 0.966 2.80 0.1166 0.1627 4.994 2.000 0.400 0.974 0.752 0.020 2.608142 DI-3B 6.000 0.540 0.80 0.4320.000'RIGHT 0.432 4 1.728 0 1.728 0.0100 0.0450 4.669 2.000 0.4284 0.0833 1.8511 0.833 2.92 0.1216 0.1463 7.467 6.000 0.804 0.947 1.636 0.092 3.440152 DI-3B 6.000 0.300 0.84 0.2520.000'RIGHT 0.252 4 1.008 0 1.008 0.0100 0.0450 3.595 2.000 0.5563 0.0833 1.8511 0.927 2.92 0.1216 0.1578 5.690 6.000 1.054 1.000 1.008 0.000 2.861208 DI-9 1.000 0.180 0.67 0.12060'RIGHT 0.121 4 0.484 0 0.484 0.0100 0.0400 2.418 2.000 0.8271 0.0833 2.0825 0.997 3.04 0.1266 0.1662 4.053 1.000 0.247 0.997 0.482 0.002 2.200208A DI-9 1.000 0.090 0.70 0.0630'RIGHT 0.063 4 0.252 0 0.252 0.0100 0.0400 1.724 2.000 1.1601 0.0833 2.0825 1.000 3.04 0.1266 0.1666 3.076 1.000 0.325 1.000 0.252 0.000 1.724210 DI-9 1.000 0.130 0.40 0.052Back/Lt.0.000'RIGHT 0.052 4 0.208 0 0.001 0.0208 3.769 2.000 0.5306 0.0833 4.0048 3.50Back/Lt.0.130 0.40 0.052Ahead/Rt.0.052 4 0.208 0Ahead/Rt.0.416 0.001 1.0001 0.416 1.816 0.166 4.816 7.276 Weir Flow320 DI-9 2.000 0.010 0.59 0.0059Back/Lt.0.000'RIGHT 0.006 10 0.06 0 0.001 0.0208 1.551 2.000 1.2895 0.0833 4.0048 3.50Back/Lt.0.010 0.59 0.0059Ahead/Rt.0.006 10 0.06 0Ahead/Rt.0.120 0.001 2.0002 0.120 0.571 0.166 4.570 2.287 Weir Flow322 2.500 0.020 0.35 0.0070'RIGHT 0.007 4 0.028 0 0.028 0.0100 0.0500 0.757 2.000 2.642 0.0833 1.666 1.000 2.80 0.1166 0.1666 1.222 2.500 2.046 1.000 0.028 0.000 0.757324 DI-1 2.000 0.110 0.90 0.099Back/Lt.0.000'RIGHT 0.099 4 0.396 0 0.001 0.0350 4.507 2.000 0.4438 0.0833 2.38 3.16Back/Lt.0.100 0.90 0.09Ahead/Rt.0.09 4 0.36 0Ahead/Rt.0.756 0.001 2.0002 0.756 1.637 0.280 5.636 3.898 Weir Flow326 DI-1 1.000 0.025 0.45 0.0113Back/Lt.0.000'RIGHT 0.011 4 0.044 0 0.001 0.0208 1.380 2.000 1.4493 0.0833 4.0048 3.50Back/Lt.0.025 0.45 0.0113Ahead/Rt.0.011 4 0.044 0Ahead/Rt.INLETSOFT BY ENSOFTECDATE: 4/16/2019 FORM LD 204STORMWATER INLET COMPUTATIONSSHEET 2 OF 5ROUTEClub DrivePROJECTKeswick Hall Additions and RenovationsDESIGNER:AADATE4/16/2019CHECKED:UNITSENGLISHINLETSag Inlets OnlyNUMBERTYPELENGTH (FT; M)STATIONDRAINAGE AREA (AC; HA)CCASCAI (IN/HR; mm/HR)Q INCR. (CFS; CMS)Qc CARRYOVER (CFS; CMS)QT GUTTER FLOW (CFS; CMS)S GUTTER SLOPE (FT/FT; M/M)Sx CROSS SLOPE (FT/FT; M/M)T (SPREAD) (FT; M)W (GUTTER WIDTH) (FT; M)W/TSw (GUTTER SLOPE) (FT/FT; M/M)Sw/SxEo (App. 9C-8)a S'wSeCOMPUTED LENGTH LT (FT; M)L, SPECIFIED LENGTH (FT; M)L/LT E (App. 9C-18)Q INTERCEPTED (CFS; CMS) or d/hQb CARRYOVER (CFS; CMS)Depth at Curb (IN; MM)Allowable Ponding Depth d (FT; M)Height of Curb Opening h (FT; M)d/hDepth at Inlet (IN; MM) T SPREAD @ SAG (FT; M)REMARKS0.088 0.001 1.0001 0.088 0.532 0.166 3.532 2.132 Weir Flow330 DI-9 2.000 0.060 0.51 0.03060.000'RIGHT 0.031 4 0.124 0 0.124 0.0100 0.0208 1.322 2.000 1.5129 0.0833 4.0048 1.000 3.50 0.1458 0.1666 2.284 2.000 0.876 1.000 0.124 0.000 1.322332 DI-9 1.000 0.003 0.57 0.0017Back/Lt.0.000'RIGHT 0.002 4 0.008 0 0.001 0.0208 0.729 2.000 2.7435 0.0833 4.0048 3.50Back/Lt.0.003 0.57 0.0017Ahead/Rt.0.002 4 0.008 0Ahead/Rt.0.016 0.001 1.0001 0.016 0.171 0.166 3.170 0.684 Weir Flow334 DI-9 1.000 0.030 0.54 0.0162Back/Lt.0.000'RIGHT 0.016 4 0.064 0 0.001 0.0208 1.588 2.000 1.2594 0.0833 4.0048 3.50Back/Lt.0.030 0.54 0.0162Ahead/Rt.0.016 4 0.064 0Ahead/Rt.0.128 0.001 1.0001 0.128 0.683 0.166 3.683 2.737 Weir Flow338 DI-9 1.500 0.140 0.73 0.10220.000'RIGHT 0.102 4 0.408 0 0.408 0.0100 0.0500 2.109 2.000 0.9483 0.0833 1.666 1.000 2.80 0.1166 0.1666 3.767 1.500 0.398 1.000 0.408 0.000 2.064340 DI-3A 1.000 0.005 0.75 0.0038Back/Lt.0.000'RIGHT 0.004 4 0.016 0 0.001 0.0208 0.945 2.000 2.1164 0.0833 4.0048 3.50Back/Lt.0.005 0.75 0.0038Ahead/Rt.0.004 4 0.016 0Ahead/Rt.0.032 0.001 1.0001 0.032 0.310 0.166 3.309 1.241 Weir Flow344 DI-1 2.000 0.060 0.55 0.033Back/Lt.0.000'RIGHT 0.033 4 0.132 0 0.001 0.0208 2.331 2.000 0.858 0.0833 4.0048 3.50Back/Lt.0.060 0.55 0.033Ahead/Rt.0.033 4 0.132 0Ahead/Rt.0.264 0.001 2.0002 0.264 0.719 0.166 4.718 2.880 Weir Flow402 DI-9 2.500 0.160 0.50 0.08Back/Lt.0.000'RIGHT 0.08 4 0.32 0 0.001 0.0800 2.938 2.000 0.6807 0.0833 1.0413 2.08Back/Lt.0.160 0.50 0.08Ahead/Rt.0.08 4 0.32 0Ahead/Rt.0.640 0.001 2.5002.5 0.640 1.240 0.640 5.739 1.291 Weir Flow420 DI-9 1.000 0.030 0.60 0.0180'RIGHT 0.018 4 0.072 0 0.072 0.0100 0.0800 1.079 2.000 1.8536 0.0833 1.0413 1.000 2.08 0.0866 0.1666 1.818 1.000 0.550 1.000 0.072 0.000 1.078424 DI-9 1.000 0.010 0.90 0.0090'RIGHT 0.009 4 0.036 0 0.036 0.0100 0.0200 0.832 2.000 2.4038 0.0833 4.165 1.000 3.52 0.1466 0.1666 1.359 1.000 0.736 1.000 0.036 0.000 0.832INLETSOFT BY ENSOFTECDATE: 4/16/2019 FORM LD 204STORMWATER INLET COMPUTATIONSSHEET 3 OF 5ROUTEClub DrivePROJECTKeswick Hall Additions and RenovationsDESIGNER:AADATE4/16/2019CHECKED:UNITSENGLISHINLETSag Inlets OnlyNUMBERTYPELENGTH (FT; M)STATIONDRAINAGE AREA (AC; HA)CCASCAI (IN/HR; mm/HR)Q INCR. (CFS; CMS)Qc CARRYOVER (CFS; CMS)QT GUTTER FLOW (CFS; CMS)S GUTTER SLOPE (FT/FT; M/M)Sx CROSS SLOPE (FT/FT; M/M)T (SPREAD) (FT; M)W (GUTTER WIDTH) (FT; M)W/TSw (GUTTER SLOPE) (FT/FT; M/M)Sw/SxEo (App. 9C-8)a S'wSeCOMPUTED LENGTH LT (FT; M)L, SPECIFIED LENGTH (FT; M)L/LT E (App. 9C-18)Q INTERCEPTED (CFS; CMS) or d/hQb CARRYOVER (CFS; CMS)Depth at Curb (IN; MM)Allowable Ponding Depth d (FT; M)Height of Curb Opening h (FT; M)d/hDepth at Inlet (IN; MM) T SPREAD @ SAG (FT; M)REMARKS424A DI-3A 1.000 0.010 0.90 0.009Back/Lt.0.000'RIGHT 0.009 4 0.036 0 0.001 0.0208 1.281 2.000 1.5613 0.0833 4.0048 3.50Back/Lt.0 4 0 0Ahead/Rt.0.036 0.001 1.0001 0.036 0.355 0.166 3.355 1.423 Weir Flow424B DI-9 1.000 0.005 0.80 0.004Back/Lt.0.000'RIGHT 0.004 4 0.016 0Back/Lt.0.005 0.90 0.0045Ahead/Rt.0.005 4 0.02 0 0.001 0.0208 1.027 2.000 1.9474 0.0833 4.0048 3.50Ahead/Rt.0.036 0.001 1.0001 0.036 0.355 0.166 3.355 1.423 Weir Flow426 DI-1 2.000 0.070 0.50 0.0350'RIGHT 0.035 4 0.14 0 0.140 0.0100 0.1000 1.209 2.000 1.6543 0.1033 1.033 1.000 2.08 0.0866 0.1866 2.245 2.000 0.891 1.000 0.140 0.000 1.499428 DI-9 1.250 0.170 0.70 0.1190'RIGHT 0.119 4 0.476 0 0.476 0.0100 0.0800 2.196 2.000 0.9107 0.0833 1.0413 0.999 2.08 0.0866 0.1665 4.020 1.250 0.311 0.999 0.475 0.001 2.187428A DI-9 1.250 0.050 0.35 0.01750'RIGHT 0.018 4 0.072 0 0.072 0.0100 0.0800 1.079 2.000 1.8536 0.0833 1.0413 1.000 2.08 0.0866 0.1666 1.818 1.250 0.688 1.000 0.072 0.000 1.078432 DI-9 1.500 0.030 0.35 0.01050'RIGHT 0.011 4 0.044 0 0.044 0.0100 0.0208 0.897 2.000 2.2297 0.0833 4.0048 1.000 3.50 0.1458 0.1666 1.478 1.500 1.015 1.000 0.044 0.000 0.897434 DI-9 1.000 0.005 0.35 0.0018Back/Lt.0.000'RIGHT 0.002 4 0.008 0 0.001 0.0208 0.729 2.000 2.7435 0.0833 4.0048 3.50Back/Lt.0.005 0.35 0.0018Ahead/Rt.0.002 4 0.008 0Ahead/Rt.0.016 0.001 1.0001 0.016 0.171 0.166 3.170 0.684 Weir Flow448 DI-9 1.000 0.030 0.80 0.024Back/Lt.0.000'RIGHT 0.024 4 0.096 0 0.001 0.0208 1.849 2.000 1.0817 0.0833 4.0048 3.50Back/Lt.0.030 0.80 0.024Ahead/Rt.0.024 4 0.096 0Ahead/Rt.0.192 0.001 1.0001 0.192 1.085 0.166 4.084 4.345 Weir Flow464 DI-9 1.000 0.005 0.35 0.0018Back/Lt.0.000'RIGHT 0.002 4 0.008 0 0.001 0.0208 0.729 2.000 2.7435 0.0833 4.0048 3.50Back/Lt.0.005 0.35 0.0018Ahead/Rt.0.002 4 0.008 0Ahead/Rt.0.016 0.001 1.0001 0.016 0.207 0.166 3.207 0.829 Weir FlowINLETSOFT BY ENSOFTECDATE: 4/16/2019 FORM LD 204STORMWATER INLET COMPUTATIONSSHEET 4 OF 5ROUTEClub DrivePROJECTKeswick Hall Additions and RenovationsDESIGNER:AADATE4/16/2019CHECKED:UNITSENGLISHINLETSag Inlets OnlyNUMBERTYPELENGTH (FT; M)STATIONDRAINAGE AREA (AC; HA)CCASCAI (IN/HR; mm/HR)Q INCR. (CFS; CMS)Qc CARRYOVER (CFS; CMS)QT GUTTER FLOW (CFS; CMS)S GUTTER SLOPE (FT/FT; M/M)Sx CROSS SLOPE (FT/FT; M/M)T (SPREAD) (FT; M)W (GUTTER WIDTH) (FT; M)W/TSw (GUTTER SLOPE) (FT/FT; M/M)Sw/SxEo (App. 9C-8)a S'wSeCOMPUTED LENGTH LT (FT; M)L, SPECIFIED LENGTH (FT; M)L/LT E (App. 9C-18)Q INTERCEPTED (CFS; CMS) or d/hQb CARRYOVER (CFS; CMS)Depth at Curb (IN; MM)Allowable Ponding Depth d (FT; M)Height of Curb Opening h (FT; M)d/hDepth at Inlet (IN; MM) T SPREAD @ SAG (FT; M)REMARKS504A DI-9 1.500 0.010 0.50 0.0050'RIGHT 0.005 4 0.02 0 0.020 0.0100 0.0800 0.668 2.000 2.994 0.0833 1.0413 1.000 2.08 0.0866 0.1666 1.061 1.500 1.414 1.000 0.020 0.000 0.667506 DI-9 1.500 0.030 0.80 0.0240.000'RIGHT 0.024 4 0.096 0 0.096 0.0100 0.0600 1.201 2.000 1.6653 0.0833 1.3883 1.000 2.56 0.1066 0.1666 2.051 1.500 0.731 1.000 0.096 0.000 1.201508 DI-9 1.500 0.010 0.35 0.00350.000'RIGHT 0.004 4 0.016 0 0.016 0.0100 0.0600 0.614 2.000 3.2573 0.0833 1.3883 1.000 2.56 0.1066 0.1666 0.966 1.500 1.553 1.000 0.016 0.000 0.614706 DI-9 1.500 0.030 0.82 0.02460.000'RIGHT 0.025 4 0.1 0 0.100 0.0100 0.0400 1.220 2.000 1.6393 0.0833 2.0825 1.000 3.04 0.1266 0.1666 2.087 1.500 0.719 1.000 0.100 0.000 1.219708 DI-9 1.500 0.160 0.82 0.1312Back/Lt.0.000'RIGHT 0.131 4 0.524 0 0.001 0.0450 4.579 2.000 0.4368 0.0833 1.8511 2.92Back/Lt.0 4 0 0Ahead/Rt.0.524 0.001 1.5001.5 0.524 1.847 0.360 5.347 3.421 Weir Flow802 DI-9 1.250 0.070 0.35 0.02450'RIGHT 0.025 4 0.1 0 0.100 0.0100 0.0800 1.220 2.000 1.6393 0.0833 1.0413 1.000 2.08 0.0866 0.1666 2.087 1.250 0.599 1.000 0.100 0.000 1.219804 DI-9 1.250 0.210 0.35 0.07350'RIGHT 0.074 4 0.296 0 0.296 0.0100 0.0800 1.832 2.000 1.0917 0.0833 1.0413 1.000 2.08 0.0866 0.1666 3.291 1.250 0.380 1.000 0.296 0.000 1.831806 DI-9 1.250 0.110 0.35 0.03850'RIGHT 0.039 4 0.156 0 0.156 0.0100 0.0800 1.441 2.000 1.3879 0.0833 1.0413 1.000 2.08 0.0866 0.1666 2.515 1.250 0.497 1.000 0.156 0.000 1.440810 DI-1 2.000 0.300 0.35 0.105Back/Lt.0.000'RIGHT 0.105 4 0.42 0 0.001 0.1000 2.665 2.000 0.7505 0.1200 1.2 2.48Back/Lt.0.170 0.35 0.0595Ahead/Rt.0.06 4 0.24 0Ahead/Rt.0.660 0.001 2.0002 0.660 1.324 0.800 6.204 1.104 Weir Flow812 DI-9 2.000 0.100 0.35 0.035Back/Lt.0.000'RIGHT 0.035 4 0.14 0 0.001 0.0400 2.270 2.000 0.8811 0.0833 2.0825 3.04Back/Lt.0.100 0.35 0.035Ahead/Rt.0.035 4 0.14 0Ahead/Rt.0.280 0.001 2.0002 0.280 0.725 0.320 4.724 1.511 Weir FlowP2 DI-9 0.500 0.005 0.90 0.0045Back/Lt.0.000'RIGHT 0.005 4 0.02 0 0.001 0.0208 1.027 2.000 1.9474 0.0833 4.0048 3.50Back/Lt.INLETSOFT BY ENSOFTECDATE: 4/16/2019 FORM LD 204STORMWATER INLET COMPUTATIONSSHEET 5 OF 5ROUTEClub DrivePROJECTKeswick Hall Additions and RenovationsDESIGNER:AADATE4/16/2019CHECKED:UNITSENGLISHINLETSag Inlets OnlyNUMBERTYPELENGTH (FT; M)STATIONDRAINAGE AREA (AC; HA)CCASCAI (IN/HR; mm/HR)Q INCR. (CFS; CMS)Qc CARRYOVER (CFS; CMS)QT GUTTER FLOW (CFS; CMS)S GUTTER SLOPE (FT/FT; M/M)Sx CROSS SLOPE (FT/FT; M/M)T (SPREAD) (FT; M)W (GUTTER WIDTH) (FT; M)W/TSw (GUTTER SLOPE) (FT/FT; M/M)Sw/SxEo (App. 9C-8)a S'wSeCOMPUTED LENGTH LT (FT; M)L, SPECIFIED LENGTH (FT; M)L/LT E (App. 9C-18)Q INTERCEPTED (CFS; CMS) or d/hQb CARRYOVER (CFS; CMS)Depth at Curb (IN; MM)Allowable Ponding Depth d (FT; M)Height of Curb Opening h (FT; M)d/hDepth at Inlet (IN; MM) T SPREAD @ SAG (FT; M)REMARKS0.005 0.90 0.0045Ahead/Rt.0.005 4 0.02 0Ahead/Rt.0.040 0.001 0.5000.5 0.040 0.605 0.166 3.105 2.424 Weir FlowP4 DI-9 0.500 0.005 0.90 0.0045Back/Lt.0.000'RIGHT 0.005 4 0.02 0 0.001 0.0208 1.027 2.000 1.9474 0.0833 4.0048 3.50Back/Lt.0.005 0.90 0.0045Ahead/Rt.0.005 4 0.02 0Ahead/Rt.0.040 0.001 0.5000.5 0.040 0.605 0.166 3.105 2.424 Weir FlowP6 DI-9 0.500 0.005 0.90 0.0045Back/Lt.0.000'RIGHT 0.005 4 0.02 0 0.001 0.0208 1.027 2.000 1.9474 0.0833 4.0048 3.50Back/Lt.0.005 0.90 0.0045Ahead/Rt.0.005 4 0.02 0Ahead/Rt.0.040 0.001 0.5000.5 0.040 0.605 0.166 3.105 2.424 Weir FlowP8 DI-9 0.500 0.005 0.90 0.0045Back/Lt.0.000'RIGHT 0.005 4 0.02 0 0.001 0.0208 1.027 2.000 1.9474 0.0833 4.0048 3.50Back/Lt.0.005 0.90 0.0045Ahead/Rt.0.005 4 0.02 0Ahead/Rt.0.040 0.001 0.5000.5 0.040 0.605 0.166 3.105 2.424 Weir FlowINLETSOFT BY ENSOFTECDATE: 4/16/2019 LD-347PROJECT:Keswick Hall AdditionsDESIGNED BY: AAHYDRAULIC GRADE LINE ANALYSISChecked: AAINCIDENCE PROBABILITY 10 YearINVERT DEPTH OUTLET DIA. DESIGN LENGTH FRICTION FRICTION JUNCTION LOSSAdj. Ht Inlet Inlet Top of MHINLET STA. EL. OF FLOW WATER PIPE DISCH. PIPE SLOPE, Sfo LOSS Contr. Hi (Expn) SKEW Bend Sum SURFACE 1.3 Shaping? 0.5 FINAL Water Top of Inlet Adjustment?OR OUTFLOW OUTFLOW SURFACE Do Qo Lo (FT/FT) Hf Vo Ho Vi Vi*2/2g 0.35*MAX. Angle K H HL FLOW Ht Ht H Surface Elev.JUNCTION PIPE PIPE ELEV. (In/mm) (CFS/CMS) (Ft/M) (M/M) (Ft/M) (Ft/M) (Vi2/2g) (Ft/M) (Ft/M) (Ft/M) Y/N (Ft/M) (Ft/M) Elevation APPROX.(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (16) (17) (18) (19)100440.000102 438.750 2.00 440.350 24 8.463 16.06 0.00125 0.020 8.440 0.277 5.674 0.500 0.175 0.0 0.00 0.000 0.451 0.000 0.451 YES 0.226 0.246 440.596 443.230 O.K.102A 439.110 2.00 440.710 24 8.463 60.18 0.00125 0.075 5.674 0.125 5.095 0.403 0.141 0.0 0.00 0.000 0.266 0.000 0.266 YES 0.133 0.208 440.918 444.170 O.K.SWM2-OUT 439.540 1.50 440.918 18 5.520 83.49 0.00246 0.205 5.095 0.101 0.000 0.000 0.000 0.0 0.00 0.000 0.101 0.000 0.101 YES 0.050 0.256 441.174 445.000 O.K.142 439.590 1.00 440.918 12 2.983 32.67 0.00624 0.204 4.854 0.091 0.000 0.000 0.000 0.0 0.00 0.000 0.091 2.983 0.119 YES 0.059 0.263 441.181 443.840 O.K.312450.000314 447.800 1.25 450.000 15 2.629 11.40 0.00148 0.017 4.173 0.068 4.089 0.260 0.091 0.0 0.00 0.000 0.158 0.000 0.158 YES 0.079 0.096 450.096 450.840 O.K.316 447.960 1.25 450.096 15 2.623 36.07 0.00147 0.053 4.089 0.065 6.826 0.724 0.253 0.0 0.00 0.000 0.318 0.000 0.318 YES 0.159 0.212 450.308 452.380 O.K.318 448.240 1.00 450.308 12 1.098 50.22 0.00085 0.042 6.826 0.181 5.149 0.412 0.144 0.0 0.00 0.000 0.325 0.000 0.325 YES 0.162 0.205 450.513 454.740 O.K.320 450.240 1.00 451.040 12 0.493 191.79 0.00017 0.033 5.149 0.103 4.127 0.264 0.093 0.0 0.00 0.000 0.195 0.076 0.195 YES 0.098 0.130 456.739 464.950 O.K.332 456.760 1.00 457.560 12 0.366 38.58 0.00009 0.004 4.127 0.066 4.089 0.260 0.091 0.0 0.00 0.000 0.157 0.026 0.157 YES 0.078 0.082 457.800 464.220 O.K.334 457.830 0.67 458.363 8 0.340 64.70 0.00071 0.046 4.089 0.065 3.400 0.180 0.063 0.0 0.00 0.000 0.128 0.207 0.166 YES 0.083 0.129 459.352 464.170 O.K.Trench Drain 461.180 0.33 461.447 4 0.133 44.48 0.00435 0.194 3.400 0.045 0.000 0.000 0.000 0.0 0.00 0.000 0.045 0.133 0.058 YES 0.029 0.223 462.313 465.000 O.K.330 448.240 1.00 450.308 12 0.203 52.52 0.00003 0.002 2.489 0.024 0.000 0.000 0.000 0.0 0.00 0.000 0.024 0.203 0.031 YES 0.016 0.017 450.325 450.900 O.K.322 448.240 1.00 450.308 12 1.412 35.58 0.00140 0.050 3.522 0.048 3.557 0.196 0.069 0.0 0.00 0.000 0.117 0.044 0.117 YES 0.058 0.108 450.416 452.800 O.K.326 448.520 1.00 450.416 12 0.144 93.39 0.00001 0.001 2.130 0.018 0.000 0.000 0.000 0.0 0.00 0.000 0.018 0.144 0.023 YES 0.011 0.013 450.429 453.600 O.K.338 450.240 1.00 451.040 12 0.667 40.62 0.00031 0.013 2.857 0.032 0.000 0.000 0.000 0.0 0.00 0.000 0.032 0.667 0.041 YES 0.021 0.033 451.073 455.570 O.K.340 458.550 0.83 459.217 10 0.052 40.51 0.00001 0.000 2.244 0.020 0.000 0.000 0.000 0.0 0.00 0.000 0.020 0.052 0.025 YES 0.013 0.013 459.393 465.250 O.K.324 448.520 1.00 450.416 12 1.236 94.32 0.00126 0.119 3.557 0.049 0.000 0.000 0.000 0.0 0.00 0.000 0.049 1.236 0.064 YES 0.032 0.151 450.567 450.870 O.K.EX.302427.750304 428.000 1.50 429.200 18 8.699 31.61 0.00611 0.193 17.522 1.192 12.014 2.241 0.784 0.0 0.00 0.000 1.976 0.000 1.976 YES 0.988 1.181 432.056 441.100 O.K.306 432.880 1.50 434.080 18 8.699 147.81 0.00611 0.903 12.014 0.560 9.964 1.542 0.540 0.0 0.00 0.000 1.100 0.000 1.100 YES 0.550 1.453 439.433 446.790 O.K.308 440.900 1.50 442.100 18 8.290 46.52 0.00555 0.258 9.964 0.385 5.434 0.459 0.160 0.0 0.00 0.000 0.546 0.000 0.546 YES 0.273 0.531 442.776 448.300 O.K.310 442.160 1.50 443.368 18 8.290 62.09 0.00555 0.344 5.434 0.115 0.000 0.000 0.000 0.0 0.00 0.000 0.115 0.000 0.115 YES 0.057 0.402 443.770 448.900 O.K.344 440.160 1.00 440.960 12 0.333 68.13 0.00008 0.005 2.357 0.022 0.000 0.000 0.000 0.0 0.00 0.000 0.022 0.333 0.028 NO 0.028 0.033 440.993 444.290 O.K.STORM GRATE 2405.940400 404.690 1.25 405.940 15 12.885 117.36 0.04159 4.881 17.098 1.135 8.318 1.074 0.376 0.0 0.00 0.000 1.511 0.000 1.511 YES 0.755 5.637 416.318 421.210 O.K.STORM GRATE 415.580 1.25 416.580 15 1.546 120.17 0.00060 0.072 9.558 0.355 5.794 0.521 0.182 0.0 0.00 0.000 0.537 0.000 0.537 YES 0.269 0.340 426.977 431.920 O.K. LD-347PROJECT:Keswick Hall AdditionsDESIGNED BY: AAHYDRAULIC GRADE LINE ANALYSISChecked: AAINCIDENCE PROBABILITY 10 YearINVERT DEPTH OUTLET DIA. DESIGN LENGTH FRICTION FRICTION JUNCTION LOSSAdj. Ht Inlet Inlet Top of MHINLET STA. EL. OF FLOW WATER PIPE DISCH. PIPE SLOPE, Sfo LOSS Contr. Hi (Expn) SKEW Bend Sum SURFACE 1.3 Shaping? 0.5 FINAL Water Top of Inlet Adjustment?OR OUTFLOW OUTFLOW SURFACE Do Qo Lo (FT/FT) Hf Vo Ho Vi Vi*2/2g 0.35*MAX. Angle K H HL FLOW Ht Ht H Surface Elev.JUNCTION PIPE PIPE ELEV. (In/mm) (CFS/CMS) (Ft/M) (M/M) (Ft/M) (Ft/M) (Vi2/2g) (Ft/M) (Ft/M) (Ft/M) Y/N (Ft/M) (Ft/M) Elevation APPROX.(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (16) (17) (18) (19)206 427.020 1.50 428.220 18 1.546 98.35 0.00023 0.022 5.794 0.130 5.983 0.556 0.195 0.0 0.00 0.000 0.325 0.000 0.325 YES 0.162 0.185 429.683 437.160 O.K.208 431.490 1.00 432.290 12 1.546 139.45 0.00168 0.234 5.983 0.139 7.874 0.963 0.337 0.0 0.00 0.000 0.476 0.753 0.619 YES 0.309 0.543 434.644 441.430 O.K.210 434.380 1.25 435.380 15 0.793 109.66 0.00013 0.015 7.874 0.241 4.736 0.348 0.122 0.0 0.00 0.000 0.363 0.654 0.471 YES 0.236 0.250 443.321 447.250 O.K.212 443.250 1.00 444.050 12 0.131 58.37 0.00001 0.001 4.736 0.087 4.736 0.348 0.122 0.0 0.00 0.000 0.209 0.000 0.209 YES 0.104 0.105 447.997 456.020 O.K.214 451.010 1.00 451.810 12 0.131 73.23 0.00001 0.001 4.736 0.087 3.367 0.176 0.062 0.0 0.00 0.000 0.149 0.000 0.149 YES 0.074 0.075 456.947 464.620 O.K.216 458.420 1.00 459.220 12 0.131 55.96 0.00001 0.001 3.367 0.044 0.000 0.000 0.000 0.0 0.00 0.000 0.044 0.131 0.057 YES 0.029 0.029 460.197 464.100 O.K.402 415.690 1.50 416.890 18 11.715 7.68 0.01108 0.085 8.318 0.269 9.954 1.539 0.538 0.0 0.00 0.000 0.807 1.044 0.807 NO 0.807 0.892 417.782 421.620 O.K.SWM1-OUT 415.890 1.25 417.782 15 10.670 26.02 0.02430 0.632 9.954 0.385 0.000 0.000 0.000 0.0 0.00 0.000 0.385 0.000 0.385 NO 0.385 1.017 418.799 422.500 O.K.SWM1-IN421.050406 420.000 1.25 421.050 15 6.597 35.37 0.00929 0.329 12.655 0.622 9.749 1.476 0.517 0.0 0.00 0.000 1.138 0.000 1.138 YES 0.569 0.898 422.501 431.000 O.K.408 426.210 1.25 427.210 15 5.603 42.24 0.00670 0.283 9.749 0.369 14.344 3.195 1.118 0.0 0.00 0.000 1.487 0.000 1.487 YES 0.744 1.027 428.237 433.250 O.K.410 427.600 1.25 428.600 15 5.029 69.88 0.00540 0.377 14.344 0.799 10.992 1.876 0.657 0.0 0.00 0.000 1.455 0.000 1.455 YES 0.728 1.105 434.670 440.200 O.K.412 434.360 1.00 435.160 12 2.716 66.06 0.00518 0.342 10.992 0.469 10.992 1.876 0.657 0.0 0.00 0.000 1.126 0.000 1.126 YES 0.563 0.905 439.332 446.800 O.K.412A 439.080 1.00 439.880 12 2.716 47.33 0.00518 0.245 10.992 0.469 5.331 0.441 0.154 0.0 0.00 0.000 0.623 0.000 0.623 YES 0.312 0.557 442.742 451.250 O.K.414 442.490 1.00 443.290 12 2.716 116.66 0.00518 0.604 5.331 0.110 4.825 0.362 0.127 0.0 0.00 0.000 0.237 0.000 0.237 NO 0.237 0.841 444.278 450.900 O.K.414A 443.760 1.00 444.560 12 2.061 75.65 0.00298 0.225 4.825 0.090 5.440 0.460 0.161 0.0 0.00 0.000 0.251 0.000 0.251 NO 0.251 0.477 445.037 451.050 O.K.418 444.550 1.00 445.350 12 1.597 102.39 0.00179 0.183 5.440 0.115 4.198 0.274 0.096 0.0 0.00 0.000 0.211 0.000 0.211 NO 0.211 0.394 446.490 453.830 O.K.420 446.190 1.00 446.990 12 1.597 51.04 0.00179 0.091 4.198 0.068 3.266 0.166 0.058 0.0 0.00 0.000 0.126 0.999 0.164 YES 0.082 0.173 447.163 452.850 O.K.424 446.670 0.83 447.337 10 0.598 87.07 0.00066 0.058 3.266 0.041 3.174 0.156 0.055 0.0 0.00 0.000 0.096 0.057 0.096 YES 0.048 0.106 447.628 451.750 O.K.424B 447.420 0.83 448.087 10 0.541 29.54 0.00054 0.016 3.174 0.039 3.135 0.153 0.053 0.0 0.00 0.000 0.093 0.057 0.093 YES 0.046 0.062 448.149 451.750 O.K.424A 447.740 0.83 448.407 10 0.484 14.02 0.00043 0.006 3.135 0.038 2.721 0.115 0.040 0.0 0.00 0.000 0.078 0.057 0.078 NO 0.078 0.084 448.491 451.750 O.K.P2 447.950 0.50 448.491 6 0.258 47.13 0.00188 0.089 2.721 0.029 2.479 0.095 0.033 0.0 0.00 0.000 0.062 0.065 0.081 NO 0.081 0.170 448.661 451.900 O.K.P6 448.320 0.50 448.720 6 0.130 16.97 0.00048 0.008 2.479 0.024 2.040 0.065 0.023 0.0 0.00 0.000 0.046 0.065 0.060 NO 0.060 0.069 448.789 451.900 O.K.P8 448.490 0.50 448.890 6 0.065 16.97 0.00012 0.002 2.040 0.016 0.000 0.000 0.000 0.0 0.00 0.000 0.016 0.065 0.021 NO 0.021 0.023 448.913 451.900 O.K.504 419.650 1.00 421.050 12 2.133 45.40 0.00319 0.145 13.160 0.672 10.581 1.738 0.608 0.0 0.00 0.000 1.281 0.000 1.281 YES 0.640 0.785 426.260 430.880 O.K.504A 426.100 1.00 426.900 12 1.512 30.87 0.00160 0.050 10.581 0.435 8.158 1.033 0.362 0.0 0.00 0.000 0.796 0.031 0.796 YES 0.398 0.448 429.428 438.000 O.K.506 429.310 1.00 430.110 12 0.858 44.06 0.00052 0.023 3.641 0.051 5.606 0.488 0.171 0.0 0.00 0.000 0.222 0.153 0.222 NO 0.222 0.245 430.355 437.500 O.K.508 433.210 1.00 434.010 12 0.648 68.55 0.00029 0.020 5.606 0.122 0.000 0.000 0.000 0.0 0.00 0.000 0.122 0.648 0.159 NO 0.159 0.179 435.705 439.800 O.K.426 426.650 0.83 427.317 10 1.113 33.94 0.00230 0.078 7.709 0.231 6.525 0.661 0.231 0.0 0.00 0.000 0.462 0.224 0.601 YES 0.300 0.378 428.609 432.900 O.K.428 428.430 0.83 429.097 10 0.889 32.21 0.00147 0.047 6.525 0.165 2.899 0.131 0.046 0.0 0.00 0.000 0.211 0.766 0.274 YES 0.137 0.184 429.888 432.800 O.K.428A 430.000 0.83 430.667 10 0.118 57.65 0.00003 0.001 2.899 0.033 0.000 0.000 0.000 0.0 0.00 0.000 0.033 0.118 0.042 NO 0.042 0.044 431.257 437.500 O.K.432 435.530 1.00 436.330 12 2.732 41.42 0.00524 0.217 10.721 0.446 10.646 1.760 0.616 0.0 0.00 0.000 1.062 0.071 1.062 YES 0.531 0.748 438.580 443.680 O.K. LD-347PROJECT:Keswick Hall AdditionsDESIGNED BY: AAHYDRAULIC GRADE LINE ANALYSISChecked: AAINCIDENCE PROBABILITY 10 YearINVERT DEPTH OUTLET DIA. DESIGN LENGTH FRICTION FRICTION JUNCTION LOSSAdj. Ht Inlet Inlet Top of MHINLET STA. EL. OF FLOW WATER PIPE DISCH. PIPE SLOPE, Sfo LOSS Contr. Hi (Expn) SKEW Bend Sum SURFACE 1.3 Shaping? 0.5 FINAL Water Top of Inlet Adjustment?OR OUTFLOW OUTFLOW SURFACE Do Qo Lo (FT/FT) Hf Vo Ho Vi Vi*2/2g 0.35*MAX. Angle K H HL FLOW Ht Ht H Surface Elev.JUNCTION PIPE PIPE ELEV. (In/mm) (CFS/CMS) (Ft/M) (M/M) (Ft/M) (Ft/M) (Vi2/2g) (Ft/M) (Ft/M) (Ft/M) Y/N (Ft/M) (Ft/M) Elevation APPROX.(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (16) (17) (18) (19)434 438.320 1.00 439.120 12 2.661 31.36 0.00497 0.156 10.646 0.440 6.879 0.735 0.257 0.0 0.00 0.000 0.697 0.022 0.697 NO 0.697 0.853 440.715 448.400 O.K.435A 444.780 1.00 445.580 12 2.614 7.99 0.00479 0.038 6.879 0.184 3.710 0.214 0.075 0.0 0.00 0.000 0.259 0.690 0.336 YES 0.168 0.206 445.786 454.320 O.K.450 445.040 0.67 445.786 8 1.295 42.87 0.01023 0.439 3.710 0.053 0.000 0.000 0.000 0.0 0.00 0.000 0.053 0.000 0.053 YES 0.027 0.465 446.252 452.400 O.K.448 440.550 0.67 441.083 8 0.314 22.36 0.00060 0.013 7.376 0.211 0.000 0.000 0.000 0.0 0.00 0.000 0.211 0.314 0.275 YES 0.137 0.151 443.260 451.100 O.K.452 447.300 0.67 447.841 8 1.295 63.30 0.01023 0.648 4.267 0.071 0.000 0.000 0.000 0.0 0.00 0.000 0.071 0.000 0.071 NO 0.071 0.718 448.559 452.000 O.K.454 449.400 0.33 449.667 4 0.136 10.38 0.00455 0.047 2.500 0.024 0.000 0.000 0.000 0.0 0.00 0.000 0.024 0.000 0.024 NO 0.024 0.071 449.738 452.000 O.K.P4 448.320 0.50 448.720 6 0.065 16.97 0.00012 0.002 2.040 0.016 0.000 0.000 0.000 0.0 0.00 0.000 0.016 0.065 0.021 NO 0.021 0.023 448.743 451.900 O.K.NGW_1 432.580 0.67 433.113 8 0.648 28.46 0.00256 0.073 8.158 0.258 0.000 0.000 0.000 0.0 0.00 0.000 0.258 0.000 0.258 NO 0.258 0.331 435.186 440.500 O.K.512 430.060 0.50 430.460 6 0.059 49.02 0.00010 0.005 1.985 0.015 0.000 0.000 0.000 0.0 0.00 0.000 0.015 0.000 0.015 NO 0.015 0.020 430.654 433.550 O.K.464 443.930 0.67 444.463 8 0.026 32.85 0.00000 0.000 1.523 0.009 0.000 0.000 0.000 0.0 0.00 0.000 0.009 0.026 0.012 NO 0.012 0.012 444.475 447.980 O.K.436 450.290 0.67 450.823 8 0.648 29.86 0.00256 0.076 6.487 0.163 0.000 0.000 0.000 0.0 0.00 0.000 0.163 0.000 0.163 YES 0.082 0.158 451.849 455.630 O.K.SWM2-IN444.000106 442.580 1.25 444.000 15 4.472 31.99 0.00427 0.137 7.060 0.193 10.237 1.627 0.570 0.0 0.00 0.000 0.763 0.000 0.763 YES 0.382 0.518 444.518 454.230 O.K.702 448.160 1.00 448.960 12 1.295 45.66 0.00118 0.054 5.689 0.126 5.687 0.502 0.176 0.0 0.00 0.000 0.301 0.000 0.301 YES 0.151 0.204 449.402 455.850 O.K.704 449.170 1.00 449.970 12 1.295 58.73 0.00118 0.069 5.687 0.126 4.441 0.306 0.107 0.0 0.00 0.000 0.233 0.000 0.233 YES 0.116 0.185 450.672 456.000 O.K.706 449.320 1.00 450.672 12 1.295 53.62 0.00118 0.063 4.441 0.077 4.878 0.369 0.129 0.0 0.00 0.000 0.206 0.163 0.206 YES 0.103 0.166 450.838 456.250 O.K.708 451.770 1.00 452.570 12 1.077 45.32 0.00081 0.037 4.878 0.092 0.000 0.000 0.000 0.0 0.00 0.000 0.092 0.979 0.120 YES 0.060 0.097 452.774 456.500 O.K.152 440.750 1.00 444.000 12 1.760 26.18 0.00217 0.057 4.790 0.089 0.000 0.000 0.000 0.0 0.00 0.000 0.089 1.760 0.116 YES 0.058 0.115 444.115 446.250 O.K.130 443.250 1.00 444.050 12 1.263 29.87 0.00112 0.033 7.087 0.195 5.755 0.514 0.180 0.0 0.00 0.000 0.375 0.000 0.375 YES 0.187 0.221 444.648 448.780 O.K.132 444.470 1.00 445.270 12 1.263 33.34 0.00112 0.037 5.755 0.129 0.000 0.000 0.000 0.0 0.00 0.000 0.129 1.263 0.167 YES 0.084 0.121 445.493 449.390 O.K.110 448.120 1.25 449.120 15 3.450 62.52 0.00254 0.159 10.237 0.407 0.000 0.000 0.000 0.0 0.00 0.000 0.407 0.000 0.407 YES 0.203 0.362 451.649 456.500 O.K.108 443.260 1.25 444.518 15 0.920 66.27 0.00018 0.012 4.556 0.081 0.000 0.000 0.000 0.0 0.00 0.000 0.081 0.000 0.081 YES 0.040 0.052 444.570 449.500 O.K. Virginia Runoff Reduction Method WorksheetDEQ Virginia Runoff Reduction Method Re-Development Compliance Spreadsheet - Version 3.0 BMP Design Specifications List:2013 Draft Stds & SpecsSite Summary439.68Site Land Cover SummaryPre-ReDevelopment Land Cover (acres)A soils B Soils C Soils D Soils Totals% of TotalForest/Open (acres)0.00 0.00 0.00 0.00 0.00 0Managed Turf (acres)0.00 0.00 0.00 6.71 6.71 69Impervious Cover (acres)0.00 0.00 0.00 2.97 2.97 319.68 100Post-ReDevelopment Land Cover (acres)A soils B Soils C Soils D Soils Totals% of TotalForest/Open (acres)0.00 0.00 0.00 0.00 0.00 0Managed Turf (acres)0.00 0.00 0.00 4.84 4.84 50Impervious Cover (acres)0.00 0.00 0.00 4.84 4.84 509.68 100Site Tv and Land Cover Nutrient LoadsPost-ReDevelopmentPost-Development (New Impervious)Adjusted Pre-ReDevelopmentPre-ReDevelopment TP Load per acre(lb/acre/yr)Final Post-Development TP Load per acre (lb/acre/yr)Post-ReDevelopment TP Load per acre (lb/acre/yr)Site Rv0.52 0.95 0.521.18 1.37 1.18Treatment Volume (ft3) 14,634 6,449 14,634TP Load (lb/yr)9.19 4.05 9.19Total TP Load Reduction Required (lb/yr)1.84 3.28Pre-ReDevelopmentTN Load (lb/yr)73.41Site Compliance SummaryFinal Post-Development Load (Post-ReDevelopment & New Impervious) 94.76Maximum % Reduction Required Below Pre-ReDevelopment Load20%5.12Final Post-Development (Post-ReDevelopment & New Impervious)0.6021,08313.25Total Disturbed Acreage: Total Rainfall (in):Summary Print Virginia Runoff Reduction Method WorksheetTotal Runoff Volume Reduction (ft3) 4,733Total TP Load Reduction Achieved (lb/yr)3.76Total TN Load Reduction Achieved (lb/yr)29.15Remaining Post Development TP Load (lb/yr)9.49Remaining TP Load Reduction (lb/yr) Required1.37Drainage Area SummaryD.A. A D.A. BD.A. C D.A. D D.A. ETotalForest/Open (acres)0.00 0.00 0.00 0.00 0.00 0.00Managed Turf (acres)0.80 0.91 0.25 0.00 0.00 1.96Impervious Cover (acres)1.16 1.64 0.25 0.00 0.00 3.05Total Area (acres)1.96 2.55 0.50 0.00 0.00 5.01Drainage Area Compliance SummaryD.A. A D.A. BD.A. C D.A. D D.A. ETotalTP Load Reduced (lb/yr)1.59 2.17 0.00 0.00 0.00 3.76TN Load Reduced (lb/yr)12.71 16.44 0.00 0.00 0.00 29.15Drainage Area A SummaryLand Cover SummaryA Soils B Soils C Soils D Soils Total% of TotalForest/Open (acres)0.00 0.00 0.00 0.00 0.00 0Managed Turf (acres)0.00 0.00 0.00 0.80 0.80 41Impervious Cover (acres)0.00 0.00 0.00 1.16 1.16 591.96BMP SelectionsPracticeManaged Turf Credit Area (acres)Impervious Cover Credit Area (acres)BMP Treatment Volume (ft3)TP Load from Upstream Practices (lbs)Untreated TP Load to Practice (lbs)TP Removed (lb/yr)TP Remaining (lb/yr)Downstream Treatment to be EmployedTotal Impervious Cover Treated (acres)0.98Total Turf Area Treated (acres) 0.71Summary Print Virginia Runoff Reduction Method WorksheetTotal TP Load Reduction Achieved in D.A. (lb/yr)1.59Total TN Load Reduction Achieved in D.A. (lb/yr)12.71Drainage Area B SummaryLand Cover SummaryA Soils B Soils C Soils D Soils Total% of TotalForest/Open (acres)0.00 0.00 0.00 0.00 0.00 0Managed Turf (acres)0.00 0.00 0.00 0.91 0.91 36Impervious Cover (acres)0.00 0.00 0.00 1.64 1.64 642.55BMP SelectionsPracticeManaged Turf Credit Area (acres)Impervious Cover Credit Area (acres)BMP Treatment Volume (ft3)TP Load from Upstream Practices (lbs)Untreated TP Load to Practice (lbs)TP Removed (lb/yr)TP Remaining (lb/yr)Downstream Treatment to be EmployedTotal Impervious Cover Treated (acres)1.19Total Turf Area Treated (acres) 0.44Total TP Load Reduction Achieved in D.A. (lb/yr)2.17Total TN Load Reduction Achieved in D.A. (lb/yr)16.44Drainage Area C SummaryLand Cover SummaryA Soils B Soils C Soils D Soils Total% of TotalForest/Open (acres)0.00 0.00 0.00 0.00 0.00 0Managed Turf (acres)0.00 0.00 0.00 0.25 0.25 50Impervious Cover (acres)0.00 0.00 0.00 0.25 0.25 500.50BMP SelectionsPracticeManaged Turf Credit Area (acres)Impervious Cover Credit Area (acres)BMP Treatment Volume (ft3)TP Load from Upstream Practices (lbs)Untreated TP Load to Practice (lbs)TP Removed (lb/yr)TP Remaining (lb/yr)Downstream Treatment to be EmployedTotal Impervious Cover Treated (acres)0.00Total Turf Area Treated (acres) 0.00Summary Print Virginia Runoff Reduction Method WorksheetTotal TP Load Reduction Achieved in D.A. (lb/yr)0.00Total TN Load Reduction Achieved in D.A. (lb/yr)0.00Drainage Area D SummaryLand Cover SummaryA Soils B Soils C Soils D Soils Total% of TotalForest/Open (acres)0.00 0.00 0.00 0.00 0.00 0Managed Turf (acres)0.00 0.00 0.00 0.00 0.00 0Impervious Cover (acres)0.00 0.00 0.00 0.00 0.00 00.00BMP SelectionsPracticeManaged Turf Credit Area (acres)Impervious Cover Credit Area (acres)BMP Treatment Volume (ft3)TP Load from Upstream Practices (lbs)Untreated TP Load to Practice (lbs)TP Removed (lb/yr)TP Remaining (lb/yr)Downstream Treatment to be EmployedTotal Impervious Cover Treated (acres)0.00Total Turf Area Treated (acres) 0.00Total TP Load Reduction Achieved in D.A. (lb/yr)0.00Total TN Load Reduction Achieved in D.A. (lb/yr)0.00Drainage Area E SummaryLand Cover SummaryA Soils B Soils C Soils D Soils Total% of TotalForest/Open (acres)0.00 0.00 0.00 0.00 0.00 0Managed Turf (acres)0.00 0.00 0.00 0.00 0.00 0Impervious Cover (acres)0.00 0.00 0.00 0.00 0.00 00.00BMP SelectionsPracticeManaged Turf Credit Area (acres)Impervious Cover Credit Area (acres)BMP Treatment Volume (ft3)TP Load from Upstream Practices (lbs)Untreated TP Load to Practice (lbs)TP Removed (lb/yr)TP Remaining (lb/yr)Downstream Treatment to be EmployedTotal Impervious Cover Treated (acres)0.00Total Turf Area Treated (acres) 0.00Summary Print Virginia Runoff Reduction Method WorksheetTotal TP Load Reduction Achieved in D.A. (lb/yr)0.00Total TN Load Reduction Achieved in D.A. (lb/yr)0.00Runoff Volume and CN Calculations1-year storm 2-year storm 10-year storm Target Rainfall Event (in)2.92 3.54 5.35Drainage Areas RV & CN Drainage Area A Drainage Area B Drainage Area C Drainage Area D Drainage Area ECN91 92 89 0 0RR (ft3)1,935 2,797 0 0 0RV wo RR (ws-in)2.00 2.09 1.83 0.00 0.00RV w RR (ws-in)1.72 1.78 1.83 0.00 0.00CN adjusted88 88 89 0 0RV wo RR (ws-in)2.58 2.68 2.39 0.00 0.00RV w RR (ws-in)2.31 2.37 2.39 0.00 0.00CN adjusted88 89 89 0 0RV wo RR (ws-in)4.32 4.43 4.11 0.00 0.00RV w RR (ws-in)4.05 4.13 4.11 0.00 0.00CN adjusted88 89 89 0 01-year return period2-year return period10-year return periodSummary Print 3SPre Area 1-2 (Onsite)5SPre Area 1-1 (Offsite)6LAreas Combined (Pre 1-1 + Pre 1-2)Routing Diagram for Keswick Hall_Analysis Points 1 (1-YR PRE)Prepared by Timmons Group, Printed 4/29/2019HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSubcatReachPondLink Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 2HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCArea Listing (all nodes)Area(acres)CN Description(subcatchment-numbers)2.110 85 CN - VRRM Spreadsheet (3S, 5S)2.110 85 TOTAL AREA Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 3HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSoil Listing (all nodes)Area(acres)SoilGroupSubcatchmentNumbers0.000 HSG A0.000 HSG B0.000 HSG C0.000 HSG D2.110 Other 3S, 5S2.110 TOTAL AREA Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 4HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCGround Covers (all nodes)HSG-A(acres)HSG-B(acres)HSG-C(acres)HSG-D(acres)Other(acres)Total(acres)GroundCoverSubcatchmentNumbers0.000 0.000 0.000 0.000 2.110 2.110 CN - VRRM Spreadsheet 3S, 5S0.000 0.000 0.000 0.000 2.110 2.110 TOTAL AREA Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 5HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCTime span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CNReach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind methodRunoff Area=1.760 ac 0.00% Impervious Runoff Depth>1.52"Subcatchment 3S: Pre Area 1-2 (Onsite) Tc=7.0 min CN=85 Runoff=4.52 cfs 0.223 afRunoff Area=0.350 ac 0.00% Impervious Runoff Depth>1.52"Subcatchment 5S: Pre Area 1-1 (Offsite) Tc=7.0 min CN=85 Runoff=0.90 cfs 0.044 af Inflow=5.42 cfs 0.267 afLink 6L: Areas Combined (Pre 1-1 + Pre 1-2) Primary=5.42 cfs 0.267 afTotal Runoff Area = 2.110 ac Runoff Volume = 0.267 af Average Runoff Depth = 1.52"100.00% Pervious = 2.110 ac 0.00% Impervious = 0.000 ac Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 6HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Subcatchment 3S: Pre Area 1-2 (Onsite)Runoff = 4.52 cfs @ 11.98 hrs, Volume= 0.223 af, Depth> 1.52"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType II 24-hr 1-YR Rainfall=2.92"Area (ac) CN Description* 1.760 85 CN - VRRM Spreadsheet1.760 100.00% Pervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)7.0Direct Entry, Subcatchment 3S: Pre Area 1-2 (Onsite)RunoffHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)543210Type II 24-hr1-YR Rainfall=2.92"Runoff Area=1.760 acRunoff Volume=0.223 afRunoff Depth>1.52"Tc=7.0 minCN=854.52 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 7HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Subcatchment 5S: Pre Area 1-1 (Offsite)Runoff = 0.90 cfs @ 11.98 hrs, Volume= 0.044 af, Depth> 1.52"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType II 24-hr 1-YR Rainfall=2.92"Area (ac) CN Description* 0.350 85 CN - VRRM Spreadsheet0.350 100.00% Pervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)7.0Direct Entry, Subcatchment 5S: Pre Area 1-1 (Offsite)RunoffHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)10Type II 24-hr1-YR Rainfall=2.92"Runoff Area=0.350 acRunoff Volume=0.044 afRunoff Depth>1.52"Tc=7.0 minCN=850.90 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 8HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Link 6L: Areas Combined (Pre 1-1 + Pre 1-2)Inflow Area = 2.110 ac, 0.00% Impervious, Inflow Depth > 1.52" for 1-YR eventInflow = 5.42 cfs @ 11.98 hrs, Volume= 0.267 afPrimary = 5.42 cfs @ 11.98 hrs, Volume= 0.267 af, Atten= 0%, Lag= 0.0 minPrimary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsLink 6L: Areas Combined (Pre 1-1 + Pre 1-2)InflowPrimaryHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)6543210Inflow Area=2.110 ac5.42 cfs5.42 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 9HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCTime span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CNReach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind methodRunoff Area=1.760 ac 0.00% Impervious Runoff Depth>2.05"Subcatchment 3S: Pre Area 1-2 (Onsite) Tc=7.0 min CN=85 Runoff=6.04 cfs 0.300 afRunoff Area=0.350 ac 0.00% Impervious Runoff Depth>2.05"Subcatchment 5S: Pre Area 1-1 (Offsite) Tc=7.0 min CN=85 Runoff=1.20 cfs 0.060 af Inflow=7.24 cfs 0.360 afLink 6L: Areas Combined (Pre 1-1 + Pre 1-2) Primary=7.24 cfs 0.360 afTotal Runoff Area = 2.110 ac Runoff Volume = 0.360 af Average Runoff Depth = 2.05"100.00% Pervious = 2.110 ac 0.00% Impervious = 0.000 ac Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 10HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Subcatchment 3S: Pre Area 1-2 (Onsite)Runoff = 6.04 cfs @ 11.98 hrs, Volume= 0.300 af, Depth> 2.05"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType II 24-hr 2-YR Rainfall=3.54"Area (ac) CN Description* 1.760 85 CN - VRRM Spreadsheet1.760 100.00% Pervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)7.0Direct Entry, Subcatchment 3S: Pre Area 1-2 (Onsite)RunoffHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)6543210Type II 24-hr2-YR Rainfall=3.54"Runoff Area=1.760 acRunoff Volume=0.300 afRunoff Depth>2.05"Tc=7.0 minCN=856.04 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 11HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Subcatchment 5S: Pre Area 1-1 (Offsite)Runoff = 1.20 cfs @ 11.98 hrs, Volume= 0.060 af, Depth> 2.05"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType II 24-hr 2-YR Rainfall=3.54"Area (ac) CN Description* 0.350 85 CN - VRRM Spreadsheet0.350 100.00% Pervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)7.0Direct Entry, Subcatchment 5S: Pre Area 1-1 (Offsite)RunoffHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)10Type II 24-hr2-YR Rainfall=3.54"Runoff Area=0.350 acRunoff Volume=0.060 afRunoff Depth>2.05"Tc=7.0 minCN=851.20 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 12HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Link 6L: Areas Combined (Pre 1-1 + Pre 1-2)Inflow Area = 2.110 ac, 0.00% Impervious, Inflow Depth > 2.05" for 2-YR eventInflow = 7.24 cfs @ 11.98 hrs, Volume= 0.360 afPrimary = 7.24 cfs @ 11.98 hrs, Volume= 0.360 af, Atten= 0%, Lag= 0.0 minPrimary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsLink 6L: Areas Combined (Pre 1-1 + Pre 1-2)InflowPrimaryHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)876543210Inflow Area=2.110 ac7.24 cfs7.24 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 13HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCTime span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CNReach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind methodRunoff Area=1.760 ac 0.00% Impervious Runoff Depth>3.69"Subcatchment 3S: Pre Area 1-2 (Onsite) Tc=7.0 min CN=85 Runoff=10.59 cfs 0.541 afRunoff Area=0.350 ac 0.00% Impervious Runoff Depth>3.69"Subcatchment 5S: Pre Area 1-1 (Offsite) Tc=7.0 min CN=85 Runoff=2.11 cfs 0.108 af Inflow=12.70 cfs 0.649 afLink 6L: Areas Combined (Pre 1-1 + Pre 1-2) Primary=12.70 cfs 0.649 afTotal Runoff Area = 2.110 ac Runoff Volume = 0.649 af Average Runoff Depth = 3.69"100.00% Pervious = 2.110 ac 0.00% Impervious = 0.000 ac Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 14HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Subcatchment 3S: Pre Area 1-2 (Onsite)Runoff = 10.59 cfs @ 11.98 hrs, Volume= 0.541 af, Depth> 3.69"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType II 24-hr 10-YR Rainfall=5.35"Area (ac) CN Description* 1.760 85 CN - VRRM Spreadsheet1.760 100.00% Pervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)7.0Direct Entry, Subcatchment 3S: Pre Area 1-2 (Onsite)RunoffHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)11109876543210Type II 24-hr10-YR Rainfall=5.35"Runoff Area=1.760 acRunoff Volume=0.541 afRunoff Depth>3.69"Tc=7.0 minCN=8510.59 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 15HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Subcatchment 5S: Pre Area 1-1 (Offsite)Runoff = 2.11 cfs @ 11.98 hrs, Volume= 0.108 af, Depth> 3.69"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType II 24-hr 10-YR Rainfall=5.35"Area (ac) CN Description* 0.350 85 CN - VRRM Spreadsheet0.350 100.00% Pervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)7.0Direct Entry, Subcatchment 5S: Pre Area 1-1 (Offsite)RunoffHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)210Type II 24-hr10-YR Rainfall=5.35"Runoff Area=0.350 acRunoff Volume=0.108 afRunoff Depth>3.69"Tc=7.0 minCN=852.11 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 1 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 16HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Link 6L: Areas Combined (Pre 1-1 + Pre 1-2)Inflow Area = 2.110 ac, 0.00% Impervious, Inflow Depth > 3.69" for 10-YR eventInflow = 12.70 cfs @ 11.98 hrs, Volume= 0.649 afPrimary = 12.70 cfs @ 11.98 hrs, Volume= 0.649 af, Atten= 0%, Lag= 0.0 minPrimary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsLink 6L: Areas Combined (Pre 1-1 + Pre 1-2)InflowPrimaryHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)14131211109876543210Inflow Area=2.110 ac12.70 cfs12.70 cfs 3S Post Area 1-4 (Onsite, Detained) 5S Post Area 1-3 (Offsite, Detained) 7S Post Area 1-5 (Onsite, Detained) 8S Post Area 1-6 (Onsite, Undetained) 7P Existing Bioretention Pond 1 9P Bioretention 4 6L Analysis Point 1 (Combined) Routing Diagram for Keswick Hall_ Analysis Points 1 (1-YR POST) Prepared by Timmons Group, Printed 4/29/2019 HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Subcat Reach Pond Link Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 2HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.270 92 Paved parking, HSG D (8S) 0.350 85 VRRM Spreadsheet D.A. A (5S) 1.190 87 VRRM Spreadsheet D.A. B (3S) 0.500 85 VRRM Spreadsheet D.A. C (7S) 2.310 87 TOTAL AREA Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 3HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.270 HSG D 8S 2.040 Other 3S, 5S, 7S 2.310 TOTAL AREA Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 4HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.270 0.000 0.270 Paved parking 8S 0.000 0.000 0.000 0.000 0.350 0.350 VRRM Spreadsheet D.A. A 5S 0.000 0.000 0.000 0.000 1.190 1.190 VRRM Spreadsheet D.A. B 3S 0.000 0.000 0.000 0.000 0.500 0.500 VRRM Spreadsheet D.A. C 7S 0.000 0.000 0.000 0.270 2.040 2.310 TOTAL AREA Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 5HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Diam/Width (inches) Height (inches) Inside-Fill (inches) 1 7P 431.00 430.41 29.4 0.0201 0.013 15.0 0.0 0.0 2 9P 445.00 444.50 100.0 0.0050 0.013 18.0 0.0 0.0 Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 6HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1.190 ac 0.00% Impervious Runoff Depth>1.67"Subcatchment 3S: Post Area 1-4 (Onsite, Tc=6.0 min CN=87 Runoff=3.39 cfs 0.165 af Runoff Area=0.350 ac 0.00% Impervious Runoff Depth>1.52"Subcatchment 5S: Post Area 1-3 (Offsite, Tc=7.0 min CN=85 Runoff=0.90 cfs 0.044 af Runoff Area=0.500 ac 0.00% Impervious Runoff Depth>1.52"Subcatchment 7S: Post Area 1-5 (Onsite, Tc=7.0 min CN=85 Runoff=1.28 cfs 0.063 af Runoff Area=0.270 ac 0.00% Impervious Runoff Depth>2.08"Subcatchment 8S: Post Area 1-6 (Onsite, Tc=6.0 min CN=92 Runoff=0.93 cfs 0.047 af Peak Elev=437.52' Storage=3,753 cf Inflow=2.18 cfs 0.108 afPond 7P: Existing Bioretention Pond 1 Outflow=0.05 cfs 0.022 af Peak Elev=448.58' Storage=3,074 cf Inflow=3.39 cfs 0.165 afPond 9P: Bioretention 4 Outflow=2.25 cfs 0.103 af Inflow=2.74 cfs 0.172 afLink 6L: Analysis Point 1 (Combined) Primary=2.74 cfs 0.172 af Total Runoff Area = 2.310 ac Runoff Volume = 0.320 af Average Runoff Depth = 1.66" 100.00% Pervious = 2.310 ac 0.00% Impervious = 0.000 ac Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 7HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Post Area 1-4 (Onsite, Detained) Runoff = 3.39 cfs @ 11.97 hrs, Volume= 0.165 af, Depth> 1.67" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 1.190 87 VRRM Spreadsheet D.A. B 1.190 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: Post Area 1-4 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=1.190 ac Runoff Volume=0.165 af Runoff Depth>1.67" Tc=6.0 min CN=87 3.39 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 8HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Area 1-3 (Offsite, Detained) Runoff = 0.90 cfs @ 11.98 hrs, Volume= 0.044 af, Depth> 1.52" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.350 85 VRRM Spreadsheet D.A. A 0.350 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 5S: Post Area 1-3 (Offsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.350 ac Runoff Volume=0.044 af Runoff Depth>1.52" Tc=7.0 min CN=85 0.90 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 9HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Post Area 1-5 (Onsite, Detained) Runoff = 1.28 cfs @ 11.98 hrs, Volume= 0.063 af, Depth> 1.52" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.500 85 VRRM Spreadsheet D.A. C 0.500 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: Post Area 1-5 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.500 ac Runoff Volume=0.063 af Runoff Depth>1.52" Tc=7.0 min CN=85 1.28 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 10HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Runoff = 0.93 cfs @ 11.97 hrs, Volume= 0.047 af, Depth> 2.08" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.270 92 Paved parking, HSG D 0.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.270 ac Runoff Volume=0.047 af Runoff Depth>2.08" Tc=6.0 min CN=92 0.93 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 11HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 7P: Existing Bioretention Pond 1 Inflow Area = 0.850 ac, 0.00% Impervious, Inflow Depth > 1.52" for 1-YR event Inflow = 2.18 cfs @ 11.98 hrs, Volume= 0.108 af Outflow = 0.05 cfs @ 16.28 hrs, Volume= 0.022 af, Atten= 98%, Lag= 257.7 min Primary = 0.05 cfs @ 16.28 hrs, Volume= 0.022 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 437.52' @ 16.28 hrs Surf.Area= 1,693 sf Storage= 3,753 cf Plug-Flow detention time= 470.8 min calculated for 0.022 af (20% of inflow) Center-of-Mass det. time= 333.7 min ( 1,160.8 - 827.1 ) Volume Invert Avail.Storage Storage Description #1 432.00' 6,264 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 432.00 1,693 0.0 0 0 435.00 1,693 40.0 2,032 2,032 437.00 1,693 25.0 847 2,878 439.00 1,693 100.0 3,386 6,264 Device Routing Invert Outlet Devices #1 Primary 431.00'15.0" Round Culvert L= 29.4' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 431.00' / 430.41' S= 0.0201 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 437.50'18.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.03 cfs @ 16.28 hrs HW=437.52' (Free Discharge) 1=Culvert (Passes 0.03 cfs of 11.32 cfs potential flow) 2=Orifice/Grate (Weir Controls 0.03 cfs @ 0.43 fps) Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 12HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 7P: Existing Bioretention Pond 1 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Inflow Area=0.850 ac Peak Elev=437.52' Storage=3,753 cf 2.18 cfs 0.05 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 13HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 9P: Bioretention 4 Inflow Area = 1.190 ac, 0.00% Impervious, Inflow Depth > 1.67" for 1-YR event Inflow = 3.39 cfs @ 11.97 hrs, Volume= 0.165 af Outflow = 2.25 cfs @ 12.06 hrs, Volume= 0.103 af, Atten= 34%, Lag= 5.6 min Primary = 2.25 cfs @ 12.06 hrs, Volume= 0.103 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 448.58' @ 12.06 hrs Surf.Area= 1,425 sf Storage= 3,074 cf Plug-Flow detention time= 186.6 min calculated for 0.103 af (62% of inflow) Center-of-Mass det. time= 77.6 min ( 896.6 - 819.0 ) Volume Invert Avail.Storage Storage Description #1 442.30' 3,710 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 442.30 1,100 0.0 0 0 445.80 1,100 40.0 1,540 1,540 447.80 1,100 25.0 550 2,090 449.00 1,600 100.0 1,620 3,710 Device Routing Invert Outlet Devices #1 Primary 445.00'18.0" Round Culvert L= 100.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 445.00' / 444.50' S= 0.0050 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #2 Device 1 448.30'18.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=2.03 cfs @ 12.06 hrs HW=448.56' (Free Discharge) 1=Culvert (Passes 2.03 cfs of 11.26 cfs potential flow) 2=Orifice/Grate (Weir Controls 2.03 cfs @ 1.66 fps) Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 14HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 9P: Bioretention 4 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Inflow Area=1.190 ac Peak Elev=448.58' Storage=3,074 cf 3.39 cfs 2.25 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_ Analysis Points 1 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 15HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 6L: Analysis Point 1 (Combined) Inflow Area = 2.310 ac, 0.00% Impervious, Inflow Depth > 0.89" for 1-YR event Inflow = 2.74 cfs @ 12.06 hrs, Volume= 0.172 af Primary = 2.74 cfs @ 12.06 hrs, Volume= 0.172 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 6L: Analysis Point 1 (Combined) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Inflow Area=2.310 ac 2.74 cfs 2.74 cfs 3S Post Area 1-4 (Onsite, Detained) 5S Post Area 1-3 (Offsite, Detained) 7S Post Area 1-5 (Onsite, Detained) 8S Post Area 1-6 (Onsite, Undetained) 7P Existing Bioretention Pond 1 9P Bioretention 4 6L Analysis Point 1 (Combined) Routing Diagram for Keswick Hall_ Analysis Points 1 (10-YR POST) Prepared by Timmons Group, Printed 4/29/2019 HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Subcat Reach Pond Link Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 2HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.270 92 Paved parking, HSG D (8S) 0.350 85 VRRM Spreadsheet D.A. A (5S) 1.190 88 VRRM Spreadsheet D.A. B (3S) 0.500 86 VRRM Spreadsheet D.A. C (7S) 2.310 88 TOTAL AREA Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 3HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.270 HSG D 8S 2.040 Other 3S, 5S, 7S 2.310 TOTAL AREA Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 4HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.270 0.000 0.270 Paved parking 8S 0.000 0.000 0.000 0.000 0.350 0.350 VRRM Spreadsheet D.A. A 5S 0.000 0.000 0.000 0.000 1.190 1.190 VRRM Spreadsheet D.A. B 3S 0.000 0.000 0.000 0.000 0.500 0.500 VRRM Spreadsheet D.A. C 7S 0.000 0.000 0.000 0.270 2.040 2.310 TOTAL AREA Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 5HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Diam/Width (inches) Height (inches) Inside-Fill (inches) 1 7P 431.00 430.41 29.4 0.0201 0.013 15.0 0.0 0.0 2 9P 445.00 444.50 100.0 0.0050 0.013 18.0 0.0 0.0 Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 6HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1.190 ac 0.00% Impervious Runoff Depth>2.30"Subcatchment 3S: Post Area 1-4 (Onsite, Tc=6.0 min CN=88 Runoff=4.61 cfs 0.228 af Runoff Area=0.350 ac 0.00% Impervious Runoff Depth>2.05"Subcatchment 5S: Post Area 1-3 (Offsite, Tc=7.0 min CN=85 Runoff=1.20 cfs 0.060 af Runoff Area=0.500 ac 0.00% Impervious Runoff Depth>2.13"Subcatchment 7S: Post Area 1-5 (Onsite, Tc=7.0 min CN=86 Runoff=1.78 cfs 0.089 af Runoff Area=0.270 ac 0.00% Impervious Runoff Depth>2.67"Subcatchment 8S: Post Area 1-6 (Onsite, Tc=6.0 min CN=92 Runoff=1.18 cfs 0.060 af Peak Elev=437.56' Storage=3,826 cf Inflow=2.98 cfs 0.149 afPond 7P: Existing Bioretention Pond 1 Outflow=0.26 cfs 0.063 af Peak Elev=448.73' Storage=3,328 cf Inflow=4.61 cfs 0.228 afPond 9P: Bioretention 4 Outflow=4.34 cfs 0.166 af Inflow=5.42 cfs 0.289 afLink 6L: Analysis Point 1 (Combined) Primary=5.42 cfs 0.289 af Total Runoff Area = 2.310 ac Runoff Volume = 0.437 af Average Runoff Depth = 2.27" 100.00% Pervious = 2.310 ac 0.00% Impervious = 0.000 ac Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 7HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Post Area 1-4 (Onsite, Detained) Runoff = 4.61 cfs @ 11.97 hrs, Volume= 0.228 af, Depth> 2.30" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 1.190 88 VRRM Spreadsheet D.A. B 1.190 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: Post Area 1-4 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)5 4 3 2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=1.190 ac Runoff Volume=0.228 af Runoff Depth>2.30" Tc=6.0 min CN=88 4.61 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 8HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Area 1-3 (Offsite, Detained) Runoff = 1.20 cfs @ 11.98 hrs, Volume= 0.060 af, Depth> 2.05" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.350 85 VRRM Spreadsheet D.A. A 0.350 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 5S: Post Area 1-3 (Offsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.350 ac Runoff Volume=0.060 af Runoff Depth>2.05" Tc=7.0 min CN=85 1.20 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 9HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Post Area 1-5 (Onsite, Detained) Runoff = 1.78 cfs @ 11.98 hrs, Volume= 0.089 af, Depth> 2.13" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.500 86 VRRM Spreadsheet D.A. C 0.500 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: Post Area 1-5 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.500 ac Runoff Volume=0.089 af Runoff Depth>2.13" Tc=7.0 min CN=86 1.78 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 10HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Runoff = 1.18 cfs @ 11.96 hrs, Volume= 0.060 af, Depth> 2.67" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.270 92 Paved parking, HSG D 0.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.270 ac Runoff Volume=0.060 af Runoff Depth>2.67" Tc=6.0 min CN=92 1.18 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 11HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 7P: Existing Bioretention Pond 1 Inflow Area = 0.850 ac, 0.00% Impervious, Inflow Depth > 2.10" for 2-YR event Inflow = 2.98 cfs @ 11.98 hrs, Volume= 0.149 af Outflow = 0.26 cfs @ 12.55 hrs, Volume= 0.063 af, Atten= 91%, Lag= 33.8 min Primary = 0.26 cfs @ 12.55 hrs, Volume= 0.063 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 437.56' @ 12.55 hrs Surf.Area= 1,693 sf Storage= 3,826 cf Plug-Flow detention time= 276.9 min calculated for 0.063 af (42% of inflow) Center-of-Mass det. time= 157.5 min ( 974.1 - 816.6 ) Volume Invert Avail.Storage Storage Description #1 432.00' 6,264 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 432.00 1,693 0.0 0 0 435.00 1,693 40.0 2,032 2,032 437.00 1,693 25.0 847 2,878 439.00 1,693 100.0 3,386 6,264 Device Routing Invert Outlet Devices #1 Primary 431.00'15.0" Round Culvert L= 29.4' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 431.00' / 430.41' S= 0.0201 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 437.50'18.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.23 cfs @ 12.55 hrs HW=437.56' (Free Discharge) 1=Culvert (Passes 0.23 cfs of 11.36 cfs potential flow) 2=Orifice/Grate (Weir Controls 0.23 cfs @ 0.80 fps) Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 12HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 7P: Existing Bioretention Pond 1 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Inflow Area=0.850 ac Peak Elev=437.56' Storage=3,826 cf 2.98 cfs 0.26 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 13HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 9P: Bioretention 4 Inflow Area = 1.190 ac, 0.00% Impervious, Inflow Depth > 2.30" for 2-YR event Inflow = 4.61 cfs @ 11.97 hrs, Volume= 0.228 af Outflow = 4.34 cfs @ 12.01 hrs, Volume= 0.166 af, Atten= 6%, Lag= 2.3 min Primary = 4.34 cfs @ 12.01 hrs, Volume= 0.166 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 448.73' @ 12.01 hrs Surf.Area= 1,565 sf Storage= 3,328 cf Plug-Flow detention time= 148.1 min calculated for 0.166 af (73% of inflow) Center-of-Mass det. time= 53.5 min ( 860.8 - 807.2 ) Volume Invert Avail.Storage Storage Description #1 442.30' 3,440 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 442.30 1,100 0.0 0 0 445.80 1,100 40.0 1,540 1,540 447.80 1,100 25.0 550 2,090 448.80 1,600 100.0 1,350 3,440 Device Routing Invert Outlet Devices #1 Primary 445.00'18.0" Round Culvert L= 100.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 445.00' / 444.50' S= 0.0050 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #2 Device 1 448.30'18.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=4.22 cfs @ 12.01 hrs HW=448.72' (Free Discharge) 1=Culvert (Passes 4.22 cfs of 11.58 cfs potential flow) 2=Orifice/Grate (Weir Controls 4.22 cfs @ 2.12 fps) Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 14HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 9P: Bioretention 4 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)5 4 3 2 1 0 Inflow Area=1.190 ac Peak Elev=448.73' Storage=3,328 cf 4.61 cfs 4.34 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 15HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 6L: Analysis Point 1 (Combined) Inflow Area = 2.310 ac, 0.00% Impervious, Inflow Depth > 1.50" for 2-YR event Inflow = 5.42 cfs @ 12.00 hrs, Volume= 0.289 af Primary = 5.42 cfs @ 12.00 hrs, Volume= 0.289 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 6L: Analysis Point 1 (Combined) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)6 5 4 3 2 1 0 Inflow Area=2.310 ac 5.42 cfs 5.42 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 16HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1.190 ac 0.00% Impervious Runoff Depth>4.00"Subcatchment 3S: Post Area 1-4 (Onsite, Tc=6.0 min CN=88 Runoff=7.77 cfs 0.397 af Runoff Area=0.350 ac 0.00% Impervious Runoff Depth>3.69"Subcatchment 5S: Post Area 1-3 (Offsite, Tc=7.0 min CN=85 Runoff=2.11 cfs 0.108 af Runoff Area=0.500 ac 0.00% Impervious Runoff Depth>3.79"Subcatchment 7S: Post Area 1-5 (Onsite, Tc=7.0 min CN=86 Runoff=3.07 cfs 0.158 af Runoff Area=0.270 ac 0.00% Impervious Runoff Depth>4.43"Subcatchment 8S: Post Area 1-6 (Onsite, Tc=6.0 min CN=92 Runoff=1.89 cfs 0.100 af Peak Elev=437.93' Storage=4,460 cf Inflow=5.18 cfs 0.266 afPond 7P: Existing Bioretention Pond 1 Outflow=4.41 cfs 0.179 af Peak Elev=449.24' Storage=3,440 cf Inflow=7.77 cfs 0.397 afPond 9P: Bioretention 4 Outflow=8.29 cfs 0.334 af Inflow=12.60 cfs 0.613 afLink 6L: Analysis Point 1 (Combined) Primary=12.60 cfs 0.613 af Total Runoff Area = 2.310 ac Runoff Volume = 0.762 af Average Runoff Depth = 3.96" 100.00% Pervious = 2.310 ac 0.00% Impervious = 0.000 ac Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 17HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Post Area 1-4 (Onsite, Detained) Runoff = 7.77 cfs @ 11.97 hrs, Volume= 0.397 af, Depth> 4.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 1.190 88 VRRM Spreadsheet D.A. B 1.190 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: Post Area 1-4 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)8 7 6 5 4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=1.190 ac Runoff Volume=0.397 af Runoff Depth>4.00" Tc=6.0 min CN=88 7.77 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 18HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Area 1-3 (Offsite, Detained) Runoff = 2.11 cfs @ 11.98 hrs, Volume= 0.108 af, Depth> 3.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.350 85 VRRM Spreadsheet D.A. A 0.350 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 5S: Post Area 1-3 (Offsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.350 ac Runoff Volume=0.108 af Runoff Depth>3.69" Tc=7.0 min CN=85 2.11 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 19HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Post Area 1-5 (Onsite, Detained) Runoff = 3.07 cfs @ 11.98 hrs, Volume= 0.158 af, Depth> 3.79" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.500 86 VRRM Spreadsheet D.A. C 0.500 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: Post Area 1-5 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.500 ac Runoff Volume=0.158 af Runoff Depth>3.79" Tc=7.0 min CN=86 3.07 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 20HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Runoff = 1.89 cfs @ 11.96 hrs, Volume= 0.100 af, Depth> 4.43" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.270 92 Paved parking, HSG D 0.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.270 ac Runoff Volume=0.100 af Runoff Depth>4.43" Tc=6.0 min CN=92 1.89 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 21HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 7P: Existing Bioretention Pond 1 Inflow Area = 0.850 ac, 0.00% Impervious, Inflow Depth > 3.75" for 10-YR event Inflow = 5.18 cfs @ 11.98 hrs, Volume= 0.266 af Outflow = 4.41 cfs @ 12.03 hrs, Volume= 0.179 af, Atten= 15%, Lag= 3.1 min Primary = 4.41 cfs @ 12.03 hrs, Volume= 0.179 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 437.93' @ 12.03 hrs Surf.Area= 1,693 sf Storage= 4,460 cf Plug-Flow detention time= 165.0 min calculated for 0.179 af (68% of inflow) Center-of-Mass det. time= 65.9 min ( 866.0 - 800.2 ) Volume Invert Avail.Storage Storage Description #1 432.00' 6,264 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 432.00 1,693 0.0 0 0 435.00 1,693 40.0 2,032 2,032 437.00 1,693 25.0 847 2,878 439.00 1,693 100.0 3,386 6,264 Device Routing Invert Outlet Devices #1 Primary 431.00'15.0" Round Culvert L= 29.4' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 431.00' / 430.41' S= 0.0201 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 437.50'18.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=4.23 cfs @ 12.03 hrs HW=437.92' (Free Discharge) 1=Culvert (Passes 4.23 cfs of 11.71 cfs potential flow) 2=Orifice/Grate (Weir Controls 4.23 cfs @ 2.12 fps) Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 22HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 7P: Existing Bioretention Pond 1 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)5 4 3 2 1 0 Inflow Area=0.850 ac Peak Elev=437.93' Storage=4,460 cf 5.18 cfs 4.41 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 23HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 9P: Bioretention 4 [93] Warning: Storage range exceeded by 0.44' [88] Warning: Qout>Qin may require smaller dt or Finer Routing Inflow Area = 1.190 ac, 0.00% Impervious, Inflow Depth > 4.00" for 10-YR event Inflow = 7.77 cfs @ 11.97 hrs, Volume= 0.397 af Outflow = 8.29 cfs @ 11.96 hrs, Volume= 0.334 af, Atten= 0%, Lag= 0.0 min Primary = 8.29 cfs @ 11.96 hrs, Volume= 0.334 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 449.24' @ 11.95 hrs Surf.Area= 1,600 sf Storage= 3,440 cf Plug-Flow detention time= 106.8 min calculated for 0.334 af (84% of inflow) Center-of-Mass det. time= 37.4 min ( 829.1 - 791.7 ) Volume Invert Avail.Storage Storage Description #1 442.30' 3,440 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 442.30 1,100 0.0 0 0 445.80 1,100 40.0 1,540 1,540 447.80 1,100 25.0 550 2,090 448.80 1,600 100.0 1,350 3,440 Device Routing Invert Outlet Devices #1 Primary 445.00'18.0" Round Culvert L= 100.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 445.00' / 444.50' S= 0.0050 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #2 Device 1 448.30'18.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=7.98 cfs @ 11.96 hrs HW=449.18' (Free Discharge) 1=Culvert (Passes 7.98 cfs of 12.44 cfs potential flow) 2=Orifice/Grate (Orifice Controls 7.98 cfs @ 4.51 fps) Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 24HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 9P: Bioretention 4 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)9 8 7 6 5 4 3 2 1 0 Inflow Area=1.190 ac Peak Elev=449.24' Storage=3,440 cf 7.77 cfs8.29 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_ Analysis Points 1 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 25HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 6L: Analysis Point 1 (Combined) Inflow Area = 2.310 ac, 0.00% Impervious, Inflow Depth > 3.18" for 10-YR event Inflow = 12.60 cfs @ 12.00 hrs, Volume= 0.613 af Primary = 12.60 cfs @ 12.00 hrs, Volume= 0.613 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 6L: Analysis Point 1 (Combined) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.310 ac 12.60 cfs 12.60 cfs 4S Pre Area 2-1 (Onsite) 7S Pre Area 2-2 (Onsite) 8S Pre Area 2-3 (Offsite) 10L Onsite Areas Combined (Pre 2-1 + Pre 2-2)11L Total Areas Combined (Pre 2-1 + Pre 2-2 + Pre 2-3) Routing Diagram for Keswick Hall_Analysis Points 2 (PRE) Prepared by Timmons Group, Printed 4/29/2019 HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Subcat Reach Pond Link Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 2HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.710 80 >75% Grass cover, Good, HSG D (7S) 1.870 84 CN VRRM Spreadsheet (4S) 0.870 98 Paved parking, HSG D (7S, 8S) 3.450 87 TOTAL AREA Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 3HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 1.580 HSG D 7S, 8S 1.870 Other 4S 3.450 TOTAL AREA Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 4HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.710 0.000 0.710 >75% Grass cover, Good 7S 0.000 0.000 0.000 0.000 1.870 1.870 CN VRRM Spreadsheet 4S 0.000 0.000 0.000 0.870 0.000 0.870 Paved parking 7S, 8S 0.000 0.000 0.000 1.580 1.870 3.450 TOTAL AREA Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 5HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1.870 ac 0.00% Impervious Runoff Depth>1.45"Subcatchment 4S: Pre Area 2-1 (Onsite) Tc=8.0 min CN=84 Runoff=4.44 cfs 0.226 af Runoff Area=1.140 ac 37.72% Impervious Runoff Depth>1.67"Subcatchment 7S: Pre Area 2-2 (Onsite) Tc=7.0 min CN=87 Runoff=3.19 cfs 0.158 af Runoff Area=0.440 ac 100.00% Impervious Runoff Depth>2.69"Subcatchment 8S: Pre Area 2-3 (Offsite) Tc=6.0 min CN=98 Runoff=1.76 cfs 0.099 af Inflow=7.61 cfs 0.384 afLink 10L: Onsite Areas Combined (Pre 2-1 + Pre 2-2) Primary=7.61 cfs 0.384 af Inflow=9.31 cfs 0.483 afLink 11L: Total Areas Combined (Pre 2-1 + Pre 2-2 + Pre 2-3) Primary=9.31 cfs 0.483 af Total Runoff Area = 3.450 ac Runoff Volume = 0.483 af Average Runoff Depth = 1.68" 74.78% Pervious = 2.580 ac 25.22% Impervious = 0.870 ac Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 6HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: Pre Area 2-1 (Onsite) Runoff = 4.44 cfs @ 12.00 hrs, Volume= 0.226 af, Depth> 1.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 1.870 84 CN VRRM Spreadsheet 1.870 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 4S: Pre Area 2-1 (Onsite) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=1.870 ac Runoff Volume=0.226 af Runoff Depth>1.45" Tc=8.0 min CN=84 4.44 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 7HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Pre Area 2-2 (Onsite) Runoff = 3.19 cfs @ 11.98 hrs, Volume= 0.158 af, Depth> 1.67" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description 0.430 98 Paved parking, HSG D 0.710 80 >75% Grass cover, Good, HSG D 1.140 87 Weighted Average 0.710 62.28% Pervious Area 0.430 37.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: Pre Area 2-2 (Onsite) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=1.140 ac Runoff Volume=0.158 af Runoff Depth>1.67" Tc=7.0 min CN=87 3.19 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 8HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Pre Area 2-3 (Offsite) Runoff = 1.76 cfs @ 11.96 hrs, Volume= 0.099 af, Depth> 2.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description 0.440 98 Paved parking, HSG D 0.440 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Pre Area 2-3 (Offsite) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.440 ac Runoff Volume=0.099 af Runoff Depth>2.69" Tc=6.0 min CN=98 1.76 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 9HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 10L: Onsite Areas Combined (Pre 2-1 + Pre 2-2) Inflow Area = 3.010 ac, 14.29% Impervious, Inflow Depth > 1.53" for 1-YR event Inflow = 7.61 cfs @ 11.99 hrs, Volume= 0.384 af Primary = 7.61 cfs @ 11.99 hrs, Volume= 0.384 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 10L: Onsite Areas Combined (Pre 2-1 + Pre 2-2) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)8 7 6 5 4 3 2 1 0 Inflow Area=3.010 ac 7.61 cfs 7.61 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 10HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 11L: Total Areas Combined (Pre 2-1 + Pre 2-2 + Pre 2-3) Inflow Area = 3.450 ac, 25.22% Impervious, Inflow Depth > 1.68" for 1-YR event Inflow = 9.31 cfs @ 11.99 hrs, Volume= 0.483 af Primary = 9.31 cfs @ 11.99 hrs, Volume= 0.483 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 11L: Total Areas Combined (Pre 2-1 + Pre 2-2 + Pre 2-3) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)10 9 8 7 6 5 4 3 2 1 0 Inflow Area=3.450 ac 9.31 cfs 9.31 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 11HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1.870 ac 0.00% Impervious Runoff Depth>1.97"Subcatchment 4S: Pre Area 2-1 (Onsite) Tc=8.0 min CN=84 Runoff=6.00 cfs 0.307 af Runoff Area=1.140 ac 37.72% Impervious Runoff Depth>2.22"Subcatchment 7S: Pre Area 2-2 (Onsite) Tc=7.0 min CN=87 Runoff=4.19 cfs 0.210 af Runoff Area=0.440 ac 100.00% Impervious Runoff Depth>3.30"Subcatchment 8S: Pre Area 2-3 (Offsite) Tc=6.0 min CN=98 Runoff=2.15 cfs 0.121 af Inflow=10.17 cfs 0.517 afLink 10L: Onsite Areas Combined (Pre 2-1 + Pre 2-2) Primary=10.17 cfs 0.517 af Inflow=12.25 cfs 0.638 afLink 11L: Total Areas Combined (Pre 2-1 + Pre 2-2 + Pre 2-3) Primary=12.25 cfs 0.638 af Total Runoff Area = 3.450 ac Runoff Volume = 0.638 af Average Runoff Depth = 2.22" 74.78% Pervious = 2.580 ac 25.22% Impervious = 0.870 ac Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 12HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: Pre Area 2-1 (Onsite) Runoff = 6.00 cfs @ 11.99 hrs, Volume= 0.307 af, Depth> 1.97" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 1.870 84 CN VRRM Spreadsheet 1.870 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 4S: Pre Area 2-1 (Onsite) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)6 5 4 3 2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=1.870 ac Runoff Volume=0.307 af Runoff Depth>1.97" Tc=8.0 min CN=84 6.00 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 13HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Pre Area 2-2 (Onsite) Runoff = 4.19 cfs @ 11.98 hrs, Volume= 0.210 af, Depth> 2.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description 0.430 98 Paved parking, HSG D 0.710 80 >75% Grass cover, Good, HSG D 1.140 87 Weighted Average 0.710 62.28% Pervious Area 0.430 37.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: Pre Area 2-2 (Onsite) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=1.140 ac Runoff Volume=0.210 af Runoff Depth>2.22" Tc=7.0 min CN=87 4.19 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 14HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Pre Area 2-3 (Offsite) Runoff = 2.15 cfs @ 11.96 hrs, Volume= 0.121 af, Depth> 3.30" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description 0.440 98 Paved parking, HSG D 0.440 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Pre Area 2-3 (Offsite) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.440 ac Runoff Volume=0.121 af Runoff Depth>3.30" Tc=6.0 min CN=98 2.15 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 15HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 10L: Onsite Areas Combined (Pre 2-1 + Pre 2-2) Inflow Area = 3.010 ac, 14.29% Impervious, Inflow Depth > 2.06" for 2-YR event Inflow = 10.17 cfs @ 11.99 hrs, Volume= 0.517 af Primary = 10.17 cfs @ 11.99 hrs, Volume= 0.517 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 10L: Onsite Areas Combined (Pre 2-1 + Pre 2-2) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=3.010 ac 10.17 cfs 10.17 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 16HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 11L: Total Areas Combined (Pre 2-1 + Pre 2-2 + Pre 2-3) Inflow Area = 3.450 ac, 25.22% Impervious, Inflow Depth > 2.22" for 2-YR event Inflow = 12.25 cfs @ 11.98 hrs, Volume= 0.638 af Primary = 12.25 cfs @ 11.98 hrs, Volume= 0.638 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 11L: Total Areas Combined (Pre 2-1 + Pre 2-2 + Pre 2-3) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=3.450 ac 12.25 cfs 12.25 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 17HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=1.870 ac 0.00% Impervious Runoff Depth>3.59"Subcatchment 4S: Pre Area 2-1 (Onsite) Tc=8.0 min CN=84 Runoff=10.69 cfs 0.559 af Runoff Area=1.140 ac 37.72% Impervious Runoff Depth>3.89"Subcatchment 7S: Pre Area 2-2 (Onsite) Tc=7.0 min CN=87 Runoff=7.15 cfs 0.370 af Runoff Area=0.440 ac 100.00% Impervious Runoff Depth>5.11"Subcatchment 8S: Pre Area 2-3 (Offsite) Tc=6.0 min CN=98 Runoff=3.26 cfs 0.187 af Inflow=17.81 cfs 0.929 afLink 10L: Onsite Areas Combined (Pre 2-1 + Pre 2-2) Primary=17.81 cfs 0.929 af Inflow=20.99 cfs 1.116 afLink 11L: Total Areas Combined (Pre 2-1 + Pre 2-2 + Pre 2-3) Primary=20.99 cfs 1.116 af Total Runoff Area = 3.450 ac Runoff Volume = 1.116 af Average Runoff Depth = 3.88" 74.78% Pervious = 2.580 ac 25.22% Impervious = 0.870 ac Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 18HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: Pre Area 2-1 (Onsite) Runoff = 10.69 cfs @ 11.99 hrs, Volume= 0.559 af, Depth> 3.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 1.870 84 CN VRRM Spreadsheet 1.870 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 4S: Pre Area 2-1 (Onsite) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=1.870 ac Runoff Volume=0.559 af Runoff Depth>3.59" Tc=8.0 min CN=84 10.69 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 19HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Pre Area 2-2 (Onsite) Runoff = 7.15 cfs @ 11.98 hrs, Volume= 0.370 af, Depth> 3.89" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description 0.430 98 Paved parking, HSG D 0.710 80 >75% Grass cover, Good, HSG D 1.140 87 Weighted Average 0.710 62.28% Pervious Area 0.430 37.72% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: Pre Area 2-2 (Onsite) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)8 7 6 5 4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=1.140 ac Runoff Volume=0.370 af Runoff Depth>3.89" Tc=7.0 min CN=87 7.15 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 20HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Pre Area 2-3 (Offsite) Runoff = 3.26 cfs @ 11.96 hrs, Volume= 0.187 af, Depth> 5.11" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description 0.440 98 Paved parking, HSG D 0.440 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Pre Area 2-3 (Offsite) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.440 ac Runoff Volume=0.187 af Runoff Depth>5.11" Tc=6.0 min CN=98 3.26 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 21HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 10L: Onsite Areas Combined (Pre 2-1 + Pre 2-2) Inflow Area = 3.010 ac, 14.29% Impervious, Inflow Depth > 3.70" for 10-YR event Inflow = 17.81 cfs @ 11.99 hrs, Volume= 0.929 af Primary = 17.81 cfs @ 11.99 hrs, Volume= 0.929 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 10L: Onsite Areas Combined (Pre 2-1 + Pre 2-2) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=3.010 ac 17.81 cfs 17.81 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (PRE) Printed 4/29/2019Prepared by Timmons Group Page 22HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 11L: Total Areas Combined (Pre 2-1 + Pre 2-2 + Pre 2-3) Inflow Area = 3.450 ac, 25.22% Impervious, Inflow Depth > 3.88" for 10-YR event Inflow = 20.99 cfs @ 11.98 hrs, Volume= 1.116 af Primary = 20.99 cfs @ 11.98 hrs, Volume= 1.116 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 11L: Total Areas Combined (Pre 2-1 + Pre 2-2 + Pre 2-3) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=3.450 ac 20.99 cfs 20.99 cfs 4S Post Area 2-5 (Onsite, Undetained)9S Post Area 2-6 (Onsite, Detained) 12S Post Area 2-8 (Onsite, Undetained) 13S Post Area 2-4 (Offsite, Detained) 14S Post Area 2-7 (Onsite, Detained) 10P SWM 1 11L Areas Combined Routing Diagram for Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Prepared by Timmons Group, Printed 4/29/2019 HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Subcat Reach Pond Link Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 2HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.440 98 VRRM SPREADSHEET D.A. A (13S) 0.690 82 VRRM SPREADSHEET D.A. B (4S) 0.400 94 VRRM SPREADSHEET D.A. C (9S) 1.100 88 VRRM SPREADSHEET D.A. D (14S) 1.040 87 VRRM SPREADSHEET D.A. E (12S) 3.670 88 TOTAL AREA Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 3HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.000 HSG D 3.670 Other 4S, 9S, 12S, 13S, 14S 3.670 TOTAL AREA Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 4HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.000 0.440 0.440 VRRM SPREADSHEET D.A. A 13 S 0.000 0.000 0.000 0.000 0.690 0.690 VRRM SPREADSHEET D.A. B 4S 0.000 0.000 0.000 0.000 0.400 0.400 VRRM SPREADSHEET D.A. C 9S 0.000 0.000 0.000 0.000 1.100 1.100 VRRM SPREADSHEET D.A. D 14 S 0.000 0.000 0.000 0.000 1.040 1.040 VRRM SPREADSHEET D.A. E 12 S 0.000 0.000 0.000 0.000 3.670 3.670 TOTAL AREA Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 5HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Diam/Width (inches) Height (inches) Inside-Fill (inches) 1 10P 416.50 416.32 34.1 0.0053 0.013 15.0 0.0 0.0 Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 6HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.690 ac 0.00% Impervious Runoff Depth>1.31"Subcatchment 4S: Post Area 2-5 (Onsite, Tc=6.0 min CN=82 Runoff=1.57 cfs 0.076 af Runoff Area=0.400 ac 0.00% Impervious Runoff Depth>2.27"Subcatchment 9S: Post Area 2-6 (Onsite, Tc=6.0 min CN=94 Runoff=1.47 cfs 0.076 af Runoff Area=1.040 ac 0.00% Impervious Runoff Depth>1.67"Subcatchment 12S: Post Area 2-8 (Onsite, Tc=7.0 min CN=87 Runoff=2.91 cfs 0.144 af Runoff Area=0.440 ac 100.00% Impervious Runoff Depth>2.69"Subcatchment 13S: Post Area 2-4 (Offsite, Tc=6.0 min CN=98 Runoff=1.76 cfs 0.099 af Runoff Area=1.100 ac 0.00% Impervious Runoff Depth>1.74"Subcatchment 14S: Post Area 2-7 (Onsite, Tc=8.0 min CN=88 Runoff=3.11 cfs 0.160 af Peak Elev=420.71' Storage=0.097 af Inflow=6.27 cfs 0.334 afPond 10P: SWM 1 Outflow=1.70 cfs 0.333 af Inflow=5.93 cfs 0.553 afLink 11L: Areas Combined Primary=5.93 cfs 0.553 af Total Runoff Area = 3.670 ac Runoff Volume = 0.554 af Average Runoff Depth = 1.81" 88.01% Pervious = 3.230 ac 11.99% Impervious = 0.440 ac Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 7HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: Post Area 2-5 (Onsite, Undetained) Runoff = 1.57 cfs @ 11.97 hrs, Volume= 0.076 af, Depth> 1.31" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.690 82 VRRM SPREADSHEET D.A. B 0.690 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 4S: Post Area 2-5 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.690 ac Runoff Volume=0.076 af Runoff Depth>1.31" Tc=6.0 min CN=82 1.57 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 8HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 9S: Post Area 2-6 (Onsite, Detained) Runoff = 1.47 cfs @ 11.96 hrs, Volume= 0.076 af, Depth> 2.27" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.400 94 VRRM SPREADSHEET D.A. C 0.400 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 9S: Post Area 2-6 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.400 ac Runoff Volume=0.076 af Runoff Depth>2.27" Tc=6.0 min CN=94 1.47 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 9HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 12S: Post Area 2-8 (Onsite, Undetained) Runoff = 2.91 cfs @ 11.98 hrs, Volume= 0.144 af, Depth> 1.67" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 1.040 87 VRRM SPREADSHEET D.A. E 1.040 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 12S: Post Area 2-8 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=1.040 ac Runoff Volume=0.144 af Runoff Depth>1.67" Tc=7.0 min CN=87 2.91 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 10HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Post Area 2-4 (Offsite, Detained) Runoff = 1.76 cfs @ 11.96 hrs, Volume= 0.099 af, Depth> 2.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.440 98 VRRM SPREADSHEET D.A. A 0.440 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 13S: Post Area 2-4 (Offsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.440 ac Runoff Volume=0.099 af Runoff Depth>2.69" Tc=6.0 min CN=98 1.76 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 11HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 14S: Post Area 2-7 (Onsite, Detained) Runoff = 3.11 cfs @ 11.99 hrs, Volume= 0.160 af, Depth> 1.74" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 1.100 88 VRRM SPREADSHEET D.A. D 1.100 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 14S: Post Area 2-7 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=1.100 ac Runoff Volume=0.160 af Runoff Depth>1.74" Tc=8.0 min CN=88 3.11 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 12HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 10P: SWM 1 Inflow Area = 1.940 ac, 22.68% Impervious, Inflow Depth > 2.07" for 1-YR event Inflow = 6.27 cfs @ 11.98 hrs, Volume= 0.334 af Outflow = 1.70 cfs @ 12.15 hrs, Volume= 0.333 af, Atten= 73%, Lag= 10.0 min Primary = 1.70 cfs @ 12.15 hrs, Volume= 0.333 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 420.71' @ 12.15 hrs Surf.Area= 0.025 ac Storage= 0.097 af Plug-Flow detention time= 20.9 min calculated for 0.333 af (100% of inflow) Center-of-Mass det. time= 19.3 min ( 810.6 - 791.3 ) Volume Invert Avail.Storage Storage Description #1 416.50' 0.130 af 72.0" Round CMP_Round 72" L= 200.0' Device Routing Invert Outlet Devices #1 Primary 416.50'15.0" Round CMP_Round 15" L= 34.1' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 416.50' / 416.32' S= 0.0053 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 416.50'5.7" Vert. Orifice/Grate C= 0.600 #3 Device 1 420.75'5.4' long Sharp-Crested Rectangular Weir 0 End Contraction(s) Primary OutFlow Max=1.70 cfs @ 12.15 hrs HW=420.71' (Free Discharge) 1=CMP_Round 15" (Passes 1.70 cfs of 8.83 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.70 cfs @ 9.60 fps) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 13HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 10P: SWM 1 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)7 6 5 4 3 2 1 0 Inflow Area=1.940 ac Peak Elev=420.71' Storage=0.097 af 6.27 cfs 1.70 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 14HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 11L: Areas Combined Inflow Area = 3.670 ac, 11.99% Impervious, Inflow Depth > 1.81" for 1-YR event Inflow = 5.93 cfs @ 11.99 hrs, Volume= 0.553 af Primary = 5.93 cfs @ 11.99 hrs, Volume= 0.553 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 11L: Areas Combined Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)6 5 4 3 2 1 0 Inflow Area=3.670 ac 5.93 cfs 5.93 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 15HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.690 ac 0.00% Impervious Runoff Depth>1.81"Subcatchment 4S: Post Area 2-5 (Onsite, Tc=6.0 min CN=82 Runoff=2.15 cfs 0.104 af Runoff Area=0.400 ac 0.00% Impervious Runoff Depth>2.87"Subcatchment 9S: Post Area 2-6 (Onsite, Tc=6.0 min CN=94 Runoff=1.83 cfs 0.096 af Runoff Area=1.040 ac 0.00% Impervious Runoff Depth>2.22"Subcatchment 12S: Post Area 2-8 (Onsite, Tc=7.0 min CN=87 Runoff=3.82 cfs 0.192 af Runoff Area=0.440 ac 100.00% Impervious Runoff Depth>3.30"Subcatchment 13S: Post Area 2-4 (Offsite, Tc=6.0 min CN=98 Runoff=2.15 cfs 0.121 af Runoff Area=1.100 ac 0.00% Impervious Runoff Depth>2.30"Subcatchment 14S: Post Area 2-7 (Onsite, Tc=8.0 min CN=88 Runoff=4.06 cfs 0.211 af Peak Elev=421.19' Storage=0.109 af Inflow=7.94 cfs 0.428 afPond 10P: SWM 1 Outflow=6.81 cfs 0.427 af Inflow=10.79 cfs 0.723 afLink 11L: Areas Combined Primary=10.79 cfs 0.723 af Total Runoff Area = 3.670 ac Runoff Volume = 0.724 af Average Runoff Depth = 2.37" 88.01% Pervious = 3.230 ac 11.99% Impervious = 0.440 ac Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 16HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: Post Area 2-5 (Onsite, Undetained) Runoff = 2.15 cfs @ 11.97 hrs, Volume= 0.104 af, Depth> 1.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.690 82 VRRM SPREADSHEET D.A. B 0.690 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 4S: Post Area 2-5 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.690 ac Runoff Volume=0.104 af Runoff Depth>1.81" Tc=6.0 min CN=82 2.15 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 17HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 9S: Post Area 2-6 (Onsite, Detained) Runoff = 1.83 cfs @ 11.96 hrs, Volume= 0.096 af, Depth> 2.87" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.400 94 VRRM SPREADSHEET D.A. C 0.400 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 9S: Post Area 2-6 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.400 ac Runoff Volume=0.096 af Runoff Depth>2.87" Tc=6.0 min CN=94 1.83 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 18HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 12S: Post Area 2-8 (Onsite, Undetained) Runoff = 3.82 cfs @ 11.98 hrs, Volume= 0.192 af, Depth> 2.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 1.040 87 VRRM SPREADSHEET D.A. E 1.040 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 12S: Post Area 2-8 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=1.040 ac Runoff Volume=0.192 af Runoff Depth>2.22" Tc=7.0 min CN=87 3.82 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 19HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Post Area 2-4 (Offsite, Detained) Runoff = 2.15 cfs @ 11.96 hrs, Volume= 0.121 af, Depth> 3.30" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.440 98 VRRM SPREADSHEET D.A. A 0.440 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 13S: Post Area 2-4 (Offsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.440 ac Runoff Volume=0.121 af Runoff Depth>3.30" Tc=6.0 min CN=98 2.15 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 20HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 14S: Post Area 2-7 (Onsite, Detained) Runoff = 4.06 cfs @ 11.99 hrs, Volume= 0.211 af, Depth> 2.30" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 1.100 88 VRRM SPREADSHEET D.A. D 1.100 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 14S: Post Area 2-7 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=1.100 ac Runoff Volume=0.211 af Runoff Depth>2.30" Tc=8.0 min CN=88 4.06 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 21HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 10P: SWM 1 Inflow Area = 1.940 ac, 22.68% Impervious, Inflow Depth > 2.65" for 2-YR event Inflow = 7.94 cfs @ 11.98 hrs, Volume= 0.428 af Outflow = 6.81 cfs @ 12.06 hrs, Volume= 0.427 af, Atten= 14%, Lag= 4.7 min Primary = 6.81 cfs @ 12.06 hrs, Volume= 0.427 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 421.19' @ 12.06 hrs Surf.Area= 0.023 ac Storage= 0.109 af Plug-Flow detention time= 19.4 min calculated for 0.426 af (100% of inflow) Center-of-Mass det. time= 18.0 min ( 803.6 - 785.6 ) Volume Invert Avail.Storage Storage Description #1 416.50' 0.130 af 72.0" Round CMP_Round 72" L= 200.0' Device Routing Invert Outlet Devices #1 Primary 416.50'15.0" Round CMP_Round 15" L= 34.1' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 416.50' / 416.32' S= 0.0053 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 416.50'5.7" Vert. Orifice/Grate C= 0.600 #3 Device 1 420.75'5.4' long Sharp-Crested Rectangular Weir 0 End Contraction(s) Primary OutFlow Max=6.31 cfs @ 12.06 hrs HW=421.15' (Free Discharge) 1=CMP_Round 15" (Passes 6.31 cfs of 9.36 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.79 cfs @ 10.12 fps) 3=Sharp-Crested Rectangular Weir (Weir Controls 4.52 cfs @ 2.08 fps) Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 22HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 10P: SWM 1 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)8 7 6 5 4 3 2 1 0 Inflow Area=1.940 ac Peak Elev=421.19' Storage=0.109 af 7.94 cfs 6.81 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 23HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 11L: Areas Combined Inflow Area = 3.670 ac, 11.99% Impervious, Inflow Depth > 2.36" for 2-YR event Inflow = 10.79 cfs @ 12.05 hrs, Volume= 0.723 af Primary = 10.79 cfs @ 12.05 hrs, Volume= 0.723 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 11L: Areas Combined Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=3.670 ac 10.79 cfs 10.79 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 24HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.690 ac 0.00% Impervious Runoff Depth>3.39"Subcatchment 4S: Post Area 2-5 (Onsite, Tc=6.0 min CN=82 Runoff=3.95 cfs 0.195 af Runoff Area=0.400 ac 0.00% Impervious Runoff Depth>4.65"Subcatchment 9S: Post Area 2-6 (Onsite, Tc=6.0 min CN=94 Runoff=2.87 cfs 0.155 af Runoff Area=1.040 ac 0.00% Impervious Runoff Depth>3.89"Subcatchment 12S: Post Area 2-8 (Onsite, Tc=7.0 min CN=87 Runoff=6.53 cfs 0.337 af Runoff Area=0.440 ac 100.00% Impervious Runoff Depth>5.11"Subcatchment 13S: Post Area 2-4 (Offsite, Tc=6.0 min CN=98 Runoff=3.26 cfs 0.187 af Runoff Area=1.100 ac 0.00% Impervious Runoff Depth>4.00"Subcatchment 14S: Post Area 2-7 (Onsite, Tc=8.0 min CN=88 Runoff=6.84 cfs 0.366 af Peak Elev=422.35' Storage=0.129 af Inflow=12.85 cfs 0.709 afPond 10P: SWM 1 Outflow=10.67 cfs 0.707 af Inflow=20.84 cfs 1.240 afLink 11L: Areas Combined Primary=20.84 cfs 1.240 af Total Runoff Area = 3.670 ac Runoff Volume = 1.241 af Average Runoff Depth = 4.06" 88.01% Pervious = 3.230 ac 11.99% Impervious = 0.440 ac Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 25HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 4S: Post Area 2-5 (Onsite, Undetained) Runoff = 3.95 cfs @ 11.97 hrs, Volume= 0.195 af, Depth> 3.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.690 82 VRRM SPREADSHEET D.A. B 0.690 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 4S: Post Area 2-5 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.690 ac Runoff Volume=0.195 af Runoff Depth>3.39" Tc=6.0 min CN=82 3.95 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 26HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 9S: Post Area 2-6 (Onsite, Detained) Runoff = 2.87 cfs @ 11.96 hrs, Volume= 0.155 af, Depth> 4.65" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.400 94 VRRM SPREADSHEET D.A. C 0.400 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 9S: Post Area 2-6 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.400 ac Runoff Volume=0.155 af Runoff Depth>4.65" Tc=6.0 min CN=94 2.87 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 27HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 12S: Post Area 2-8 (Onsite, Undetained) Runoff = 6.53 cfs @ 11.98 hrs, Volume= 0.337 af, Depth> 3.89" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 1.040 87 VRRM SPREADSHEET D.A. E 1.040 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 12S: Post Area 2-8 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)7 6 5 4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=1.040 ac Runoff Volume=0.337 af Runoff Depth>3.89" Tc=7.0 min CN=87 6.53 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 28HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Post Area 2-4 (Offsite, Detained) Runoff = 3.26 cfs @ 11.96 hrs, Volume= 0.187 af, Depth> 5.11" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.440 98 VRRM SPREADSHEET D.A. A 0.440 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 13S: Post Area 2-4 (Offsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.440 ac Runoff Volume=0.187 af Runoff Depth>5.11" Tc=6.0 min CN=98 3.26 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 29HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 14S: Post Area 2-7 (Onsite, Detained) Runoff = 6.84 cfs @ 11.99 hrs, Volume= 0.366 af, Depth> 4.00" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 1.100 88 VRRM SPREADSHEET D.A. D 1.100 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 14S: Post Area 2-7 (Onsite, Detained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)7 6 5 4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=1.100 ac Runoff Volume=0.366 af Runoff Depth>4.00" Tc=8.0 min CN=88 6.84 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 30HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 10P: SWM 1 Inflow Area = 1.940 ac, 22.68% Impervious, Inflow Depth > 4.38" for 10-YR event Inflow = 12.85 cfs @ 11.98 hrs, Volume= 0.709 af Outflow = 10.67 cfs @ 12.03 hrs, Volume= 0.707 af, Atten= 17%, Lag= 3.0 min Primary = 10.67 cfs @ 12.03 hrs, Volume= 0.707 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 422.35' @ 12.03 hrs Surf.Area= 0.009 ac Storage= 0.129 af Plug-Flow detention time= 16.6 min calculated for 0.707 af (100% of inflow) Center-of-Mass det. time= 15.3 min ( 789.4 - 774.1 ) Volume Invert Avail.Storage Storage Description #1 416.50' 0.130 af 72.0" Round CMP_Round 72" L= 200.0' Device Routing Invert Outlet Devices #1 Primary 416.50'15.0" Round CMP_Round 15" L= 34.1' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 416.50' / 416.32' S= 0.0053 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 416.50'5.7" Vert. Orifice/Grate C= 0.600 #3 Device 1 420.75'5.4' long Sharp-Crested Rectangular Weir 0 End Contraction(s) Primary OutFlow Max=10.56 cfs @ 12.03 hrs HW=422.25' (Free Discharge) 1=CMP_Round 15" (Inlet Controls 10.56 cfs @ 8.60 fps) 2=Orifice/Grate (Passes < 2.00 cfs potential flow) 3=Sharp-Crested Rectangular Weir (Passes < 32.39 cfs potential flow) Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 31HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 10P: SWM 1 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=1.940 ac Peak Elev=422.35' Storage=0.129 af 12.85 cfs 10.67 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 2 (POST) - 18.12.10 Rev Printed 4/29/2019Prepared by Timmons Group Page 32HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 11L: Areas Combined Inflow Area = 3.670 ac, 11.99% Impervious, Inflow Depth > 4.05" for 10-YR event Inflow = 20.84 cfs @ 11.98 hrs, Volume= 1.240 af Primary = 20.84 cfs @ 11.98 hrs, Volume= 1.240 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 11L: Areas Combined Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=3.670 ac 20.84 cfs 20.84 cfs 12S Post Area 3-2 (Onsite, Undetained) 13S Pre Area 3-1 (Onsite, Undetained) Routing Diagram for Keswick Hall_Analysis Points 3 (PRE-POST) Prepared by Timmons Group, Printed 4/29/2019 HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Subcat Reach Pond Link Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 2HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 1.030 82 VRRM Spreadsheet A (13S) 0.520 82 VRRM Spreadsheet D.A. B (12S) 1.550 82 TOTAL AREA Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 3HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.000 HSG D 1.550 Other 12S, 13S 1.550 TOTAL AREA Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 4HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.000 1.030 1.030 VRRM Spreadsheet A 13S 0.000 0.000 0.000 0.000 0.520 0.520 VRRM Spreadsheet D.A. B 12S 0.000 0.000 0.000 0.000 1.550 1.550 TOTAL AREA Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 5HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.520 ac 0.00% Impervious Runoff Depth>1.31"Subcatchment 12S: Post Area 3-2 (Onsite, Tc=8.0 min CN=82 Runoff=1.12 cfs 0.057 af Runoff Area=1.030 ac 0.00% Impervious Runoff Depth>1.31"Subcatchment 13S: Pre Area 3-1 (Onsite, Tc=8.0 min CN=82 Runoff=2.22 cfs 0.113 af Total Runoff Area = 1.550 ac Runoff Volume = 0.170 af Average Runoff Depth = 1.31" 100.00% Pervious = 1.550 ac 0.00% Impervious = 0.000 ac Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 6HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 12S: Post Area 3-2 (Onsite, Undetained) Runoff = 1.12 cfs @ 12.00 hrs, Volume= 0.057 af, Depth> 1.31" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.520 82 VRRM Spreadsheet D.A. B 0.520 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 12S: Post Area 3-2 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.520 ac Runoff Volume=0.057 af Runoff Depth>1.31" Tc=8.0 min CN=82 1.12 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 7HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Pre Area 3-1 (Onsite, Undetained) Runoff = 2.22 cfs @ 12.00 hrs, Volume= 0.113 af, Depth> 1.31" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 1.030 82 VRRM Spreadsheet A 1.030 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 13S: Pre Area 3-1 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=1.030 ac Runoff Volume=0.113 af Runoff Depth>1.31" Tc=8.0 min CN=82 2.22 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 8HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.520 ac 0.00% Impervious Runoff Depth>1.81"Subcatchment 12S: Post Area 3-2 (Onsite, Tc=8.0 min CN=82 Runoff=1.54 cfs 0.079 af Runoff Area=1.030 ac 0.00% Impervious Runoff Depth>1.81"Subcatchment 13S: Pre Area 3-1 (Onsite, Tc=8.0 min CN=82 Runoff=3.06 cfs 0.156 af Total Runoff Area = 1.550 ac Runoff Volume = 0.234 af Average Runoff Depth = 1.81" 100.00% Pervious = 1.550 ac 0.00% Impervious = 0.000 ac Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 9HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 12S: Post Area 3-2 (Onsite, Undetained) Runoff = 1.54 cfs @ 12.00 hrs, Volume= 0.079 af, Depth> 1.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.520 82 VRRM Spreadsheet D.A. B 0.520 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 12S: Post Area 3-2 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.520 ac Runoff Volume=0.079 af Runoff Depth>1.81" Tc=8.0 min CN=82 1.54 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 10HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Pre Area 3-1 (Onsite, Undetained) Runoff = 3.06 cfs @ 12.00 hrs, Volume= 0.156 af, Depth> 1.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 1.030 82 VRRM Spreadsheet A 1.030 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 13S: Pre Area 3-1 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=1.030 ac Runoff Volume=0.156 af Runoff Depth>1.81" Tc=8.0 min CN=82 3.06 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 11HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.520 ac 0.00% Impervious Runoff Depth>3.39"Subcatchment 12S: Post Area 3-2 (Onsite, Tc=8.0 min CN=82 Runoff=2.83 cfs 0.147 af Runoff Area=1.030 ac 0.00% Impervious Runoff Depth>3.39"Subcatchment 13S: Pre Area 3-1 (Onsite, Tc=8.0 min CN=82 Runoff=5.61 cfs 0.291 af Total Runoff Area = 1.550 ac Runoff Volume = 0.438 af Average Runoff Depth = 3.39" 100.00% Pervious = 1.550 ac 0.00% Impervious = 0.000 ac Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 12HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 12S: Post Area 3-2 (Onsite, Undetained) Runoff = 2.83 cfs @ 11.99 hrs, Volume= 0.147 af, Depth> 3.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.520 82 VRRM Spreadsheet D.A. B 0.520 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 12S: Post Area 3-2 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.520 ac Runoff Volume=0.147 af Runoff Depth>3.39" Tc=8.0 min CN=82 2.83 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Points 3 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 13HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Pre Area 3-1 (Onsite, Undetained) Runoff = 5.61 cfs @ 11.99 hrs, Volume= 0.291 af, Depth> 3.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 1.030 82 VRRM Spreadsheet A 1.030 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 13S: Pre Area 3-1 (Onsite, Undetained) Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)6 5 4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=1.030 ac Runoff Volume=0.291 af Runoff Depth>3.39" Tc=8.0 min CN=82 5.61 cfs 2SPre Area 4-1Routing Diagram for Keswick Hall_Analysis Point 4 (1-YR PRE)Prepared by Timmons Group, Printed 4/29/2019HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSubcatReachPondLink Keswick Hall_Analysis Point 4 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 2HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCArea Listing (all nodes)Area(acres)CN Description(subcatchment-numbers)2.020 87 VRRM Spreadsheet (2S)2.020 87 TOTAL AREA Keswick Hall_Analysis Point 4 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 3HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSoil Listing (all nodes)Area(acres)SoilGroupSubcatchmentNumbers0.000 HSG A0.000 HSG B0.000 HSG C0.000 HSG D2.020 Other 2S2.020 TOTAL AREA Keswick Hall_Analysis Point 4 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 4HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCGround Covers (all nodes)HSG-A(acres)HSG-B(acres)HSG-C(acres)HSG-D(acres)Other(acres)Total(acres)GroundCoverSubcatchmentNumbers0.000 0.000 0.000 0.000 2.020 2.020 VRRM Spreadsheet 2S0.000 0.000 0.000 0.000 2.020 2.020 TOTAL AREA Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 5HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCTime span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CNReach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind methodRunoff Area=2.020 ac 0.00% Impervious Runoff Depth>1.67"Subcatchment 2S: Pre Area 4-1 Tc=6.0 min CN=87 Runoff=5.76 cfs 0.281 afTotal Runoff Area = 2.020 ac Runoff Volume = 0.281 af Average Runoff Depth = 1.67"100.00% Pervious = 2.020 ac 0.00% Impervious = 0.000 ac Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 6HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Subcatchment 2S: Pre Area 4-1Runoff = 5.76 cfs @ 11.97 hrs, Volume= 0.281 af, Depth> 1.67"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType II 24-hr 1-YR Rainfall=2.92"Area (ac) CN Description* 2.020 87 VRRM Spreadsheet2.020 100.00% Pervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)6.0Direct Entry, Subcatchment 2S: Pre Area 4-1RunoffHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)6543210Type II 24-hr1-YR Rainfall=2.92"Runoff Area=2.020 acRunoff Volume=0.281 afRunoff Depth>1.67"Tc=6.0 minCN=875.76 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 7HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCTime span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CNReach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind methodRunoff Area=2.020 ac 0.00% Impervious Runoff Depth>2.22"Subcatchment 2S: Pre Area 4-1 Tc=6.0 min CN=87 Runoff=7.57 cfs 0.373 afTotal Runoff Area = 2.020 ac Runoff Volume = 0.373 af Average Runoff Depth = 2.22"100.00% Pervious = 2.020 ac 0.00% Impervious = 0.000 ac Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 8HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Subcatchment 2S: Pre Area 4-1Runoff = 7.57 cfs @ 11.97 hrs, Volume= 0.373 af, Depth> 2.22"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType II 24-hr 2-YR Rainfall=3.54"Area (ac) CN Description* 2.020 87 VRRM Spreadsheet2.020 100.00% Pervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)6.0Direct Entry, Subcatchment 2S: Pre Area 4-1RunoffHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)876543210Type II 24-hr2-YR Rainfall=3.54"Runoff Area=2.020 acRunoff Volume=0.373 afRunoff Depth>2.22"Tc=6.0 minCN=877.57 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 9HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCTime span=0.00-24.00 hrs, dt=0.05 hrs, 481 pointsRunoff by SCS TR-20 method, UH=SCS, Weighted-CNReach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind methodRunoff Area=2.020 ac 0.00% Impervious Runoff Depth>3.89"Subcatchment 2S: Pre Area 4-1 Tc=6.0 min CN=87 Runoff=12.94 cfs 0.656 afTotal Runoff Area = 2.020 ac Runoff Volume = 0.656 af Average Runoff Depth = 3.89"100.00% Pervious = 2.020 ac 0.00% Impervious = 0.000 ac Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (1-YR PRE) Printed 4/29/2019Prepared by Timmons GroupPage 10HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLCSummary for Subcatchment 2S: Pre Area 4-1Runoff = 12.94 cfs @ 11.97 hrs, Volume= 0.656 af, Depth> 3.89"Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrsType II 24-hr 10-YR Rainfall=5.35"Area (ac) CN Description* 2.020 87 VRRM Spreadsheet2.020 100.00% Pervious AreaTc Length Slope Velocity Capacity Description(min) (feet) (ft/ft) (ft/sec) (cfs)6.0Direct Entry, Subcatchment 2S: Pre Area 4-1RunoffHydrographTime (hours)2423222120191817161514131211109876543210Flow (cfs)14131211109876543210Type II 24-hr10-YR Rainfall=5.35"Runoff Area=2.020 acRunoff Volume=0.656 afRunoff Depth>3.89"Tc=6.0 minCN=8712.94 cfs 3S POST AREA 4-2 5S POST AREA 4-3 6S POST AREA 4-4 11S POST AREA 4-5 12S POST AREA 4-6 13S POST AREA 4-7 4P BIORETENTION 2 7P BIORETENTION 3 9P SWM 2 10L Areas Combined Routing Diagram for Keswick Hall_Analysis Point 4 (1-YR POST) Prepared by Timmons Group, Printed 4/29/2019 HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Subcat Reach Pond Link Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 2HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.190 88 VRRM SPREADSHEET (13S) 0.360 91 VRRM SPREADSHEET D.A. A (3S) 0.620 86 VRRM SPREADSHEET D.A. B (5S) 0.320 82 VRRM SPREADSHEET D.A. C (6S) 0.530 90 VRRM SPREADSHEET D.A. D (11S) 0.540 89 VRRM SPREADSHEET D.A. E (12S) 2.560 88 TOTAL AREA Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 3HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.000 HSG D 2.560 Other 3S, 5S, 6S, 11S, 12S, 13S 2.560 TOTAL AREA Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 4HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.000 0.190 0.190 VRRM SPREADSHEET 13 S 0.000 0.000 0.000 0.000 0.360 0.360 VRRM SPREADSHEET D.A. A 3S 0.000 0.000 0.000 0.000 0.620 0.620 VRRM SPREADSHEET D.A. B 5S 0.000 0.000 0.000 0.000 0.320 0.320 VRRM SPREADSHEET D.A. C 6S 0.000 0.000 0.000 0.000 0.530 0.530 VRRM SPREADSHEET D.A. D 11 S 0.000 0.000 0.000 0.000 0.540 0.540 VRRM SPREADSHEET D.A. E 12 S 0.000 0.000 0.000 0.000 2.560 2.560 TOTAL AREA Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 5HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Diam/Width (inches) Height (inches) Inside-Fill (inches) 1 4P 450.00 442.00 280.0 0.0286 0.013 15.0 0.0 0.0 2 7P 445.00 442.00 280.0 0.0107 0.013 15.0 0.0 0.0 3 9P 440.00 438.00 50.0 0.0400 0.013 18.0 0.0 0.0 Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 6HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.360 ac 0.00% Impervious Runoff Depth>1.99"Subcatchment 3S: POST AREA 4-2 Tc=6.0 min CN=91 Runoff=1.20 cfs 0.060 af Runoff Area=0.620 ac 0.00% Impervious Runoff Depth>1.59"Subcatchment 5S: POST AREA 4-3 Tc=6.0 min CN=86 Runoff=1.69 cfs 0.082 af Runoff Area=0.320 ac 0.00% Impervious Runoff Depth>1.31"Subcatchment 6S: POST AREA 4-4 Tc=7.0 min CN=82 Runoff=0.71 cfs 0.035 af Runoff Area=0.530 ac 0.00% Impervious Runoff Depth>1.91"Subcatchment 11S: POST AREA 4-5 Tc=6.0 min CN=90 Runoff=1.70 cfs 0.084 af Runoff Area=0.540 ac 0.00% Impervious Runoff Depth>1.83"Subcatchment 12S: POST AREA 4-6 Tc=6.0 min CN=89 Runoff=1.67 cfs 0.082 af Runoff Area=0.190 ac 0.00% Impervious Runoff Depth>1.74"Subcatchment 13S: POST AREA 4-7 Tc=7.0 min CN=88 Runoff=0.55 cfs 0.028 af Peak Elev=456.48' Storage=3,582 cf Inflow=1.69 cfs 0.082 afPond 4P: BIORETENTION 2 Outflow=0.00 cfs 0.000 af Peak Elev=448.50' Storage=1,526 cf Inflow=0.71 cfs 0.035 afPond 7P: BIORETENTION 3 Outflow=0.00 cfs 0.000 af Peak Elev=443.17' Storage=0.039 af Inflow=2.24 cfs 0.112 afPond 9P: SWM 2 Outflow=0.41 cfs 0.112 af Inflow=3.20 cfs 0.254 afLink 10L: Areas Combined Primary=3.20 cfs 0.254 af Total Runoff Area = 2.560 ac Runoff Volume = 0.371 af Average Runoff Depth = 1.74" 100.00% Pervious = 2.560 ac 0.00% Impervious = 0.000 ac Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 7HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST AREA 4-2 Runoff = 1.20 cfs @ 11.97 hrs, Volume= 0.060 af, Depth> 1.99" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.360 91 VRRM SPREADSHEET D.A. A 0.360 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: POST AREA 4-2 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.360 ac Runoff Volume=0.060 af Runoff Depth>1.99" Tc=6.0 min CN=91 1.20 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 8HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST AREA 4-3 Runoff = 1.69 cfs @ 11.97 hrs, Volume= 0.082 af, Depth> 1.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.620 86 VRRM SPREADSHEET D.A. B 0.620 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 5S: POST AREA 4-3 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.620 ac Runoff Volume=0.082 af Runoff Depth>1.59" Tc=6.0 min CN=86 1.69 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 9HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: POST AREA 4-4 Runoff = 0.71 cfs @ 11.99 hrs, Volume= 0.035 af, Depth> 1.31" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.320 82 VRRM SPREADSHEET D.A. C 0.320 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 6S: POST AREA 4-4 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.320 ac Runoff Volume=0.035 af Runoff Depth>1.31" Tc=7.0 min CN=82 0.71 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 10HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: POST AREA 4-5 Runoff = 1.70 cfs @ 11.97 hrs, Volume= 0.084 af, Depth> 1.91" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.530 90 VRRM SPREADSHEET D.A. D 0.530 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 11S: POST AREA 4-5 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.530 ac Runoff Volume=0.084 af Runoff Depth>1.91" Tc=6.0 min CN=90 1.70 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 11HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 12S: POST AREA 4-6 Runoff = 1.67 cfs @ 11.97 hrs, Volume= 0.082 af, Depth> 1.83" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.540 89 VRRM SPREADSHEET D.A. E 0.540 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 12S: POST AREA 4-6 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.540 ac Runoff Volume=0.082 af Runoff Depth>1.83" Tc=6.0 min CN=89 1.67 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 12HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: POST AREA 4-7 Runoff = 0.55 cfs @ 11.98 hrs, Volume= 0.028 af, Depth> 1.74" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.190 88 VRRM SPREADSHEET 0.190 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 13S: POST AREA 4-7 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.190 ac Runoff Volume=0.028 af Runoff Depth>1.74" Tc=7.0 min CN=88 0.55 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 13HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 4P: BIORETENTION 2 Inflow Area = 0.620 ac, 0.00% Impervious, Inflow Depth > 1.59" for 1-YR event Inflow = 1.69 cfs @ 11.97 hrs, Volume= 0.082 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 456.48' @ 24.00 hrs Surf.Area= 2,119 sf Storage= 3,582 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 452.00' 7,100 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 452.00 2,000 0.0 0 0 454.00 2,000 40.0 1,600 1,600 456.00 2,000 25.0 1,000 2,600 458.00 2,500 100.0 4,500 7,100 Device Routing Invert Outlet Devices #1 Primary 450.00'15.0" Round CMP_Round 15" L= 280.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 450.00' / 442.00' S= 0.0286 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 456.50'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 456.84'6.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=452.00' (Free Discharge) 1=CMP_Round 15" (Passes 0.00 cfs of 5.47 cfs potential flow) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 14HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 4P: BIORETENTION 2 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Inflow Area=0.620 ac Peak Elev=456.48' Storage=3,582 cf 1.69 cfs 0.00 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 15HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION 3 Inflow Area = 0.320 ac, 0.00% Impervious, Inflow Depth > 1.31" for 1-YR event Inflow = 0.71 cfs @ 11.99 hrs, Volume= 0.035 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 448.50' @ 24.00 hrs Surf.Area= 1,300 sf Storage= 1,526 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 445.00' 3,090 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 445.00 1,300 0.0 0 0 447.00 1,300 40.0 1,040 1,040 449.00 1,300 25.0 650 1,690 450.00 1,500 100.0 1,400 3,090 Device Routing Invert Outlet Devices #1 Primary 445.00'15.0" Round CMP_Round 15" L= 280.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 445.00' / 442.00' S= 0.0107 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 449.60'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=445.00' (Free Discharge) 1=CMP_Round 15" ( Controls 0.00 cfs) 2=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 16HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION 3 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.320 ac Peak Elev=448.50' Storage=1,526 cf 0.71 cfs 0.00 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 17HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 9P: SWM 2 [79] Warning: Submerged Pond 4P Primary device # 1 OUTLET by 1.17' [79] Warning: Submerged Pond 7P Primary device # 1 OUTLET by 1.17' Inflow Area = 1.660 ac, 0.00% Impervious, Inflow Depth > 0.81" for 1-YR event Inflow = 2.24 cfs @ 11.97 hrs, Volume= 0.112 af Outflow = 0.41 cfs @ 12.17 hrs, Volume= 0.112 af, Atten= 82%, Lag= 12.1 min Primary = 0.41 cfs @ 12.17 hrs, Volume= 0.112 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 443.17' @ 12.17 hrs Surf.Area= 0.012 ac Storage= 0.039 af Plug-Flow detention time= 36.4 min calculated for 0.111 af (100% of inflow) Center-of-Mass det. time= 34.5 min ( 843.5 - 809.0 ) Volume Invert Avail.Storage Storage Description #1 440.00' 0.046 af 48.0" Round CMP_Round 48" L= 160.0' Device Routing Invert Outlet Devices #1 Primary 440.00'18.0" Round CMP_Round 18" L= 50.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 440.00' / 438.00' S= 0.0400 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #2 Device 1 440.00'3.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 443.25'3.5' long Sharp-Crested Rectangular Weir 0 End Contraction(s) Primary OutFlow Max=0.41 cfs @ 12.17 hrs HW=443.16' (Free Discharge) 1=CMP_Round 18" (Passes 0.41 cfs of 10.44 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.41 cfs @ 8.39 fps) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 18HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 9P: SWM 2 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Inflow Area=1.660 ac Peak Elev=443.17' Storage=0.039 af 2.24 cfs 0.41 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 4 (1-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 19HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 10L: Areas Combined Inflow Area = 2.560 ac, 0.00% Impervious, Inflow Depth > 1.19" for 1-YR event Inflow = 3.20 cfs @ 11.97 hrs, Volume= 0.254 af Primary = 3.20 cfs @ 11.97 hrs, Volume= 0.254 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 10L: Areas Combined Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Inflow Area=2.560 ac 3.20 cfs 3.20 cfs 3S POST AREA 4-2 5S POST AREA 4-3 6S POST AREA 4-4 11S POST AREA 4-5 12S POST AREA 4-6 13S POST AREA 4-7 4P BIORETENTION 2 7P BIORETENTION 3 9P SWM 2 10L Areas Combined Routing Diagram for Keswick Hall_Analysis Point 4 (10-YR POST) Prepared by Timmons Group, Printed 4/29/2019 HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Subcat Reach Pond Link Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 2HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.190 89 VRRM SPREADSHEET (13S) 0.360 91 VRRM SPREADSHEET D.A. A (3S) 0.620 87 VRRM SPREADSHEET D.A. B (5S) 0.320 84 VRRM SPREADSHEET D.A. C (6S) 0.530 90 VRRM SPREADSHEET D.A. D (11S) 0.540 90 VRRM SPREADSHEET D.A. E (12S) 2.560 89 TOTAL AREA Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 3HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.000 HSG D 2.560 Other 3S, 5S, 6S, 11S, 12S, 13S 2.560 TOTAL AREA Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 4HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.000 0.190 0.190 VRRM SPREADSHEET 13 S 0.000 0.000 0.000 0.000 0.360 0.360 VRRM SPREADSHEET D.A. A 3S 0.000 0.000 0.000 0.000 0.620 0.620 VRRM SPREADSHEET D.A. B 5S 0.000 0.000 0.000 0.000 0.320 0.320 VRRM SPREADSHEET D.A. C 6S 0.000 0.000 0.000 0.000 0.530 0.530 VRRM SPREADSHEET D.A. D 11 S 0.000 0.000 0.000 0.000 0.540 0.540 VRRM SPREADSHEET D.A. E 12 S 0.000 0.000 0.000 0.000 2.560 2.560 TOTAL AREA Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 5HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Diam/Width (inches) Height (inches) Inside-Fill (inches) 1 4P 450.00 442.00 280.0 0.0286 0.013 15.0 0.0 0.0 2 7P 445.00 442.00 280.0 0.0107 0.013 15.0 0.0 0.0 3 9P 440.00 438.00 50.0 0.0400 0.013 18.0 0.0 0.0 Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 6HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.360 ac 0.00% Impervious Runoff Depth>2.58"Subcatchment 3S: POST AREA 4-2 Tc=6.0 min CN=91 Runoff=1.53 cfs 0.077 af Runoff Area=0.620 ac 0.00% Impervious Runoff Depth>2.22"Subcatchment 5S: POST AREA 4-3 Tc=6.0 min CN=87 Runoff=2.32 cfs 0.114 af Runoff Area=0.320 ac 0.00% Impervious Runoff Depth>1.97"Subcatchment 6S: POST AREA 4-4 Tc=7.0 min CN=84 Runoff=1.06 cfs 0.052 af Runoff Area=0.530 ac 0.00% Impervious Runoff Depth>2.48"Subcatchment 11S: POST AREA 4-5 Tc=6.0 min CN=90 Runoff=2.18 cfs 0.110 af Runoff Area=0.540 ac 0.00% Impervious Runoff Depth>2.48"Subcatchment 12S: POST AREA 4-6 Tc=6.0 min CN=90 Runoff=2.22 cfs 0.112 af Runoff Area=0.190 ac 0.00% Impervious Runoff Depth>2.39"Subcatchment 13S: POST AREA 4-7 Tc=7.0 min CN=89 Runoff=0.74 cfs 0.038 af Peak Elev=456.51' Storage=3,661 cf Inflow=2.32 cfs 0.114 afPond 4P: BIORETENTION 2 Outflow=0.07 cfs 0.031 af Peak Elev=449.44' Storage=2,285 cf Inflow=1.06 cfs 0.052 afPond 7P: BIORETENTION 3 Outflow=0.00 cfs 0.000 af Peak Elev=443.59' Storage=0.044 af Inflow=2.91 cfs 0.178 afPond 9P: SWM 2 Outflow=2.66 cfs 0.178 af Inflow=5.01 cfs 0.367 afLink 10L: Areas Combined Primary=5.01 cfs 0.367 af Total Runoff Area = 2.560 ac Runoff Volume = 0.504 af Average Runoff Depth = 2.36" 100.00% Pervious = 2.560 ac 0.00% Impervious = 0.000 ac Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 7HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST AREA 4-2 Runoff = 1.53 cfs @ 11.97 hrs, Volume= 0.077 af, Depth> 2.58" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.360 91 VRRM SPREADSHEET D.A. A 0.360 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: POST AREA 4-2 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.360 ac Runoff Volume=0.077 af Runoff Depth>2.58" Tc=6.0 min CN=91 1.53 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 8HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST AREA 4-3 Runoff = 2.32 cfs @ 11.97 hrs, Volume= 0.114 af, Depth> 2.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.620 87 VRRM SPREADSHEET D.A. B 0.620 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 5S: POST AREA 4-3 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.620 ac Runoff Volume=0.114 af Runoff Depth>2.22" Tc=6.0 min CN=87 2.32 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 9HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: POST AREA 4-4 Runoff = 1.06 cfs @ 11.98 hrs, Volume= 0.052 af, Depth> 1.97" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.320 84 VRRM SPREADSHEET D.A. C 0.320 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 6S: POST AREA 4-4 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.320 ac Runoff Volume=0.052 af Runoff Depth>1.97" Tc=7.0 min CN=84 1.06 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 10HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: POST AREA 4-5 Runoff = 2.18 cfs @ 11.97 hrs, Volume= 0.110 af, Depth> 2.48" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.530 90 VRRM SPREADSHEET D.A. D 0.530 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 11S: POST AREA 4-5 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.530 ac Runoff Volume=0.110 af Runoff Depth>2.48" Tc=6.0 min CN=90 2.18 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 11HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 12S: POST AREA 4-6 Runoff = 2.22 cfs @ 11.97 hrs, Volume= 0.112 af, Depth> 2.48" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.540 90 VRRM SPREADSHEET D.A. E 0.540 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 12S: POST AREA 4-6 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.540 ac Runoff Volume=0.112 af Runoff Depth>2.48" Tc=6.0 min CN=90 2.22 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 12HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: POST AREA 4-7 Runoff = 0.74 cfs @ 11.98 hrs, Volume= 0.038 af, Depth> 2.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.190 89 VRRM SPREADSHEET 0.190 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 13S: POST AREA 4-7 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.190 ac Runoff Volume=0.038 af Runoff Depth>2.39" Tc=7.0 min CN=89 0.74 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 13HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 4P: BIORETENTION 2 Inflow Area = 0.620 ac, 0.00% Impervious, Inflow Depth > 2.22" for 2-YR event Inflow = 2.32 cfs @ 11.97 hrs, Volume= 0.114 af Outflow = 0.07 cfs @ 14.14 hrs, Volume= 0.031 af, Atten= 97%, Lag= 130.6 min Primary = 0.07 cfs @ 14.14 hrs, Volume= 0.031 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 456.51' @ 14.14 hrs Surf.Area= 2,129 sf Storage= 3,661 cf Plug-Flow detention time= 392.4 min calculated for 0.031 af (27% of inflow) Center-of-Mass det. time= 259.7 min ( 1,070.6 - 810.9 ) Volume Invert Avail.Storage Storage Description #1 452.00' 7,100 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 452.00 2,000 0.0 0 0 454.00 2,000 40.0 1,600 1,600 456.00 2,000 25.0 1,000 2,600 458.00 2,500 100.0 4,500 7,100 Device Routing Invert Outlet Devices #1 Primary 450.00'15.0" Round CMP_Round 15" L= 280.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 450.00' / 442.00' S= 0.0286 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 456.50'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 456.84'6.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.03 cfs @ 14.14 hrs HW=456.51' (Free Discharge) 1=CMP_Round 15" (Passes 0.03 cfs of 11.32 cfs potential flow) 2=Orifice/Grate (Weir Controls 0.03 cfs @ 0.39 fps) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 14HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 4P: BIORETENTION 2 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Inflow Area=0.620 ac Peak Elev=456.51' Storage=3,661 cf 2.32 cfs 0.07 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 15HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION 3 Inflow Area = 0.320 ac, 0.00% Impervious, Inflow Depth > 1.97" for 2-YR event Inflow = 1.06 cfs @ 11.98 hrs, Volume= 0.052 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 449.44' @ 24.00 hrs Surf.Area= 1,389 sf Storage= 2,285 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 445.00' 3,090 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 445.00 1,300 0.0 0 0 447.00 1,300 40.0 1,040 1,040 449.00 1,300 25.0 650 1,690 450.00 1,500 100.0 1,400 3,090 Device Routing Invert Outlet Devices #1 Primary 445.00'15.0" Round CMP_Round 15" L= 280.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 445.00' / 442.00' S= 0.0107 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 449.60'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=445.00' (Free Discharge) 1=CMP_Round 15" ( Controls 0.00 cfs) 2=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 16HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION 3 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Inflow Area=0.320 ac Peak Elev=449.44' Storage=2,285 cf 1.06 cfs 0.00 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 17HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 9P: SWM 2 [79] Warning: Submerged Pond 4P Primary device # 1 OUTLET by 1.58' [79] Warning: Submerged Pond 7P Primary device # 1 OUTLET by 1.58' Inflow Area = 1.660 ac, 0.00% Impervious, Inflow Depth > 1.29" for 2-YR event Inflow = 2.91 cfs @ 11.97 hrs, Volume= 0.178 af Outflow = 2.66 cfs @ 12.05 hrs, Volume= 0.178 af, Atten= 8%, Lag= 5.0 min Primary = 2.66 cfs @ 12.05 hrs, Volume= 0.178 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 443.59' @ 12.05 hrs Surf.Area= 0.009 ac Storage= 0.044 af Plug-Flow detention time= 31.1 min calculated for 0.177 af (99% of inflow) Center-of-Mass det. time= 28.9 min ( 876.2 - 847.3 ) Volume Invert Avail.Storage Storage Description #1 440.00' 0.046 af 48.0" Round CMP_Round 48" L= 160.0' Device Routing Invert Outlet Devices #1 Primary 440.00'18.0" Round CMP_Round 18" L= 50.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 440.00' / 438.00' S= 0.0400 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #2 Device 1 440.00'3.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 443.25'3.5' long Sharp-Crested Rectangular Weir 0 End Contraction(s) Primary OutFlow Max=2.55 cfs @ 12.05 hrs HW=443.57' (Free Discharge) 1=CMP_Round 18" (Passes 2.55 cfs of 11.29 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.44 cfs @ 8.94 fps) 3=Sharp-Crested Rectangular Weir (Weir Controls 2.11 cfs @ 1.86 fps) Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 18HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 9P: SWM 2 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Inflow Area=1.660 ac Peak Elev=443.59' Storage=0.044 af 2.91 cfs 2.66 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 19HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 10L: Areas Combined Inflow Area = 2.560 ac, 0.00% Impervious, Inflow Depth > 1.72" for 2-YR event Inflow = 5.01 cfs @ 12.04 hrs, Volume= 0.367 af Primary = 5.01 cfs @ 12.04 hrs, Volume= 0.367 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 10L: Areas Combined Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)5 4 3 2 1 0 Inflow Area=2.560 ac 5.01 cfs 5.01 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 20HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.360 ac 0.00% Impervious Runoff Depth>4.32"Subcatchment 3S: POST AREA 4-2 Tc=6.0 min CN=91 Runoff=2.48 cfs 0.130 af Runoff Area=0.620 ac 0.00% Impervious Runoff Depth>3.89"Subcatchment 5S: POST AREA 4-3 Tc=6.0 min CN=87 Runoff=3.97 cfs 0.201 af Runoff Area=0.320 ac 0.00% Impervious Runoff Depth>3.59"Subcatchment 6S: POST AREA 4-4 Tc=7.0 min CN=84 Runoff=1.88 cfs 0.096 af Runoff Area=0.530 ac 0.00% Impervious Runoff Depth>4.21"Subcatchment 11S: POST AREA 4-5 Tc=6.0 min CN=90 Runoff=3.59 cfs 0.186 af Runoff Area=0.540 ac 0.00% Impervious Runoff Depth>4.21"Subcatchment 12S: POST AREA 4-6 Tc=6.0 min CN=90 Runoff=3.66 cfs 0.189 af Runoff Area=0.190 ac 0.00% Impervious Runoff Depth>4.10"Subcatchment 13S: POST AREA 4-7 Tc=7.0 min CN=89 Runoff=1.24 cfs 0.065 af Peak Elev=456.75' Storage=4,169 cf Inflow=3.97 cfs 0.201 afPond 4P: BIORETENTION 2 Outflow=2.56 cfs 0.117 af Peak Elev=449.64' Storage=2,557 cf Inflow=1.88 cfs 0.096 afPond 7P: BIORETENTION 3 Outflow=0.16 cfs 0.038 af Peak Elev=443.87' Storage=0.046 af Inflow=5.83 cfs 0.406 afPond 9P: SWM 2 Outflow=6.06 cfs 0.405 af Inflow=12.06 cfs 0.724 afLink 10L: Areas Combined Primary=12.06 cfs 0.724 af Total Runoff Area = 2.560 ac Runoff Volume = 0.867 af Average Runoff Depth = 4.06" 100.00% Pervious = 2.560 ac 0.00% Impervious = 0.000 ac Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 21HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: POST AREA 4-2 Runoff = 2.48 cfs @ 11.96 hrs, Volume= 0.130 af, Depth> 4.32" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.360 91 VRRM SPREADSHEET D.A. A 0.360 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: POST AREA 4-2 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.360 ac Runoff Volume=0.130 af Runoff Depth>4.32" Tc=6.0 min CN=91 2.48 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 22HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: POST AREA 4-3 Runoff = 3.97 cfs @ 11.97 hrs, Volume= 0.201 af, Depth> 3.89" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.620 87 VRRM SPREADSHEET D.A. B 0.620 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 5S: POST AREA 4-3 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.620 ac Runoff Volume=0.201 af Runoff Depth>3.89" Tc=6.0 min CN=87 3.97 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 23HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 6S: POST AREA 4-4 Runoff = 1.88 cfs @ 11.98 hrs, Volume= 0.096 af, Depth> 3.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.320 84 VRRM SPREADSHEET D.A. C 0.320 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 6S: POST AREA 4-4 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.320 ac Runoff Volume=0.096 af Runoff Depth>3.59" Tc=7.0 min CN=84 1.88 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 24HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: POST AREA 4-5 Runoff = 3.59 cfs @ 11.96 hrs, Volume= 0.186 af, Depth> 4.21" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.530 90 VRRM SPREADSHEET D.A. D 0.530 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 11S: POST AREA 4-5 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.530 ac Runoff Volume=0.186 af Runoff Depth>4.21" Tc=6.0 min CN=90 3.59 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 25HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 12S: POST AREA 4-6 Runoff = 3.66 cfs @ 11.96 hrs, Volume= 0.189 af, Depth> 4.21" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.540 90 VRRM SPREADSHEET D.A. E 0.540 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 12S: POST AREA 4-6 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.540 ac Runoff Volume=0.189 af Runoff Depth>4.21" Tc=6.0 min CN=90 3.66 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 26HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: POST AREA 4-7 Runoff = 1.24 cfs @ 11.98 hrs, Volume= 0.065 af, Depth> 4.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.190 89 VRRM SPREADSHEET 0.190 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 13S: POST AREA 4-7 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.190 ac Runoff Volume=0.065 af Runoff Depth>4.10" Tc=7.0 min CN=89 1.24 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 27HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 4P: BIORETENTION 2 Inflow Area = 0.620 ac, 0.00% Impervious, Inflow Depth > 3.89" for 10-YR event Inflow = 3.97 cfs @ 11.97 hrs, Volume= 0.201 af Outflow = 2.56 cfs @ 12.06 hrs, Volume= 0.117 af, Atten= 36%, Lag= 5.7 min Primary = 2.56 cfs @ 12.06 hrs, Volume= 0.117 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 456.75' @ 12.06 hrs Surf.Area= 2,187 sf Storage= 4,169 cf Plug-Flow detention time= 195.4 min calculated for 0.117 af (58% of inflow) Center-of-Mass det. time= 89.5 min ( 884.4 - 795.0 ) Volume Invert Avail.Storage Storage Description #1 452.00' 7,100 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 452.00 2,000 0.0 0 0 454.00 2,000 40.0 1,600 1,600 456.00 2,000 25.0 1,000 2,600 458.00 2,500 100.0 4,500 7,100 Device Routing Invert Outlet Devices #1 Primary 450.00'15.0" Round CMP_Round 15" L= 280.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 450.00' / 442.00' S= 0.0286 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 456.50'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 456.84'6.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=2.40 cfs @ 12.06 hrs HW=456.74' (Free Discharge) 1=CMP_Round 15" (Passes 2.40 cfs of 11.53 cfs potential flow) 2=Orifice/Grate (Weir Controls 2.40 cfs @ 1.60 fps) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 28HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 4P: BIORETENTION 2 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Inflow Area=0.620 ac Peak Elev=456.75' Storage=4,169 cf 3.97 cfs 2.56 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 29HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 7P: BIORETENTION 3 Inflow Area = 0.320 ac, 0.00% Impervious, Inflow Depth > 3.59" for 10-YR event Inflow = 1.88 cfs @ 11.98 hrs, Volume= 0.096 af Outflow = 0.16 cfs @ 12.52 hrs, Volume= 0.038 af, Atten= 91%, Lag= 32.5 min Primary = 0.16 cfs @ 12.52 hrs, Volume= 0.038 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 449.64' @ 12.52 hrs Surf.Area= 1,427 sf Storage= 2,557 cf Plug-Flow detention time= 284.7 min calculated for 0.038 af (40% of inflow) Center-of-Mass det. time= 164.5 min ( 969.4 - 804.9 ) Volume Invert Avail.Storage Storage Description #1 445.00' 3,090 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Voids Inc.Store Cum.Store (feet) (sq-ft) (%) (cubic-feet) (cubic-feet) 445.00 1,300 0.0 0 0 447.00 1,300 40.0 1,040 1,040 449.00 1,300 25.0 650 1,690 450.00 1,500 100.0 1,400 3,090 Device Routing Invert Outlet Devices #1 Primary 445.00'15.0" Round CMP_Round 15" L= 280.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 445.00' / 442.00' S= 0.0107 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 449.60'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.14 cfs @ 12.52 hrs HW=449.64' (Free Discharge) 1=CMP_Round 15" (Passes 0.14 cfs of 8.57 cfs potential flow) 2=Orifice/Grate (Weir Controls 0.14 cfs @ 0.61 fps) Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 30HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 7P: BIORETENTION 3 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Inflow Area=0.320 ac Peak Elev=449.64' Storage=2,557 cf 1.88 cfs 0.16 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 31HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Pond 9P: SWM 2 [88] Warning: Qout>Qin may require smaller dt or Finer Routing [79] Warning: Submerged Pond 4P Primary device # 1 OUTLET by 1.86' [79] Warning: Submerged Pond 7P Primary device # 1 OUTLET by 1.86' Inflow Area = 1.660 ac, 0.00% Impervious, Inflow Depth > 2.94" for 10-YR event Inflow = 5.83 cfs @ 12.01 hrs, Volume= 0.406 af Outflow = 6.06 cfs @ 12.04 hrs, Volume= 0.405 af, Atten= 0%, Lag= 1.5 min Primary = 6.06 cfs @ 12.04 hrs, Volume= 0.405 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 443.87' @ 12.04 hrs Surf.Area= 0.005 ac Storage= 0.046 af Plug-Flow detention time= 30.5 min calculated for 0.404 af (99% of inflow) Center-of-Mass det. time= 28.2 min ( 859.7 - 831.4 ) Volume Invert Avail.Storage Storage Description #1 440.00' 0.046 af 48.0" Round CMP_Round 48" L= 160.0' Device Routing Invert Outlet Devices #1 Primary 440.00'18.0" Round CMP_Round 18" L= 50.0' CMP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 440.00' / 438.00' S= 0.0400 '/' Cc= 0.900 n= 0.013, Flow Area= 1.77 sf #2 Device 1 440.00'3.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 443.25'3.5' long Sharp-Crested Rectangular Weir 0 End Contraction(s) Primary OutFlow Max=5.77 cfs @ 12.04 hrs HW=443.85' (Free Discharge) 1=CMP_Round 18" (Passes 5.77 cfs of 11.83 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.46 cfs @ 9.29 fps) 3=Sharp-Crested Rectangular Weir (Weir Controls 5.31 cfs @ 2.53 fps) Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 32HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Pond 9P: SWM 2 Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)6 5 4 3 2 1 0 Inflow Area=1.660 ac Peak Elev=443.87' Storage=0.046 af 5.83 cfs6.06 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 4 (10-YR POST) Printed 4/29/2019Prepared by Timmons Group Page 33HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 10L: Areas Combined Inflow Area = 2.560 ac, 0.00% Impervious, Inflow Depth > 3.39" for 10-YR event Inflow = 12.06 cfs @ 11.97 hrs, Volume= 0.724 af Primary = 12.06 cfs @ 11.97 hrs, Volume= 0.724 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 10L: Areas Combined Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.560 ac 12.06 cfs 12.06 cfs 1S Pre Area 5-2 2S Post Area 5-4 3S Pre Area 5-1 5S Post Area 5-3 4L Areas Combined (Pre 5-1 + Pre 5-2) 6L Areas Combined (Post 5-3 + Post 5-4) Routing Diagram for Keswick Hall_Analysis Point 5 (PRE-POST) Prepared by Timmons Group, Printed 4/29/2019 HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Subcat Reach Pond Link Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 2HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 0.560 84 VRRM SPREADSHEET D.A. A (3S) 0.920 91 VRRM SPREADSHEET D.A. B (1S) 0.560 89 VRRM SPREADSHEET D.A. C (5S) 0.600 93 VRRM SPREADSHEET D.A. D (2S) 2.640 90 TOTAL AREA Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 3HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.000 HSG D 2.640 Other 1S, 2S, 3S, 5S 2.640 TOTAL AREA Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 4HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.000 0.560 0.560 VRRM SPREADSHEET D.A. A 3S 0.000 0.000 0.000 0.000 0.920 0.920 VRRM SPREADSHEET D.A. B 1S 0.000 0.000 0.000 0.000 0.560 0.560 VRRM SPREADSHEET D.A. C 5S 0.000 0.000 0.000 0.000 0.600 0.600 VRRM SPREADSHEET D.A. D 2S 0.000 0.000 0.000 0.000 2.640 2.640 TOTAL AREA Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 5HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.920 ac 0.00% Impervious Runoff Depth>1.99"Subcatchment 1S: Pre Area 5-2 Tc=13.0 min CN=91 Runoff=2.48 cfs 0.153 af Runoff Area=0.600 ac 0.00% Impervious Runoff Depth>2.17"Subcatchment 2S: Post Area 5-4 Tc=13.0 min CN=93 Runoff=1.73 cfs 0.109 af Runoff Area=0.560 ac 0.00% Impervious Runoff Depth>1.45"Subcatchment 3S: Pre Area 5-1 Tc=7.0 min CN=84 Runoff=1.37 cfs 0.068 af Runoff Area=0.560 ac 0.00% Impervious Runoff Depth>1.83"Subcatchment 5S: Post Area 5-3 Tc=6.0 min CN=89 Runoff=1.73 cfs 0.085 af Inflow=3.66 cfs 0.220 afLink 4L: Areas Combined (Pre 5-1 + Pre 5-2) Primary=3.66 cfs 0.220 af Inflow=3.25 cfs 0.194 afLink 6L: Areas Combined (Post 5-3 + Post 5-4) Primary=3.25 cfs 0.194 af Total Runoff Area = 2.640 ac Runoff Volume = 0.414 af Average Runoff Depth = 1.88" 100.00% Pervious = 2.640 ac 0.00% Impervious = 0.000 ac Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 6HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pre Area 5-2 Runoff = 2.48 cfs @ 12.05 hrs, Volume= 0.153 af, Depth> 1.99" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.920 91 VRRM SPREADSHEET D.A. B 0.920 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.0 Direct Entry, Subcatchment 1S: Pre Area 5-2 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.920 ac Runoff Volume=0.153 af Runoff Depth>1.99" Tc=13.0 min CN=91 2.48 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 7HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Post Area 5-4 Runoff = 1.73 cfs @ 12.04 hrs, Volume= 0.109 af, Depth> 2.17" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.600 93 VRRM SPREADSHEET D.A. D 0.600 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.0 Direct Entry, Subcatchment 2S: Post Area 5-4 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.600 ac Runoff Volume=0.109 af Runoff Depth>2.17" Tc=13.0 min CN=93 1.73 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 8HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Pre Area 5-1 Runoff = 1.37 cfs @ 11.99 hrs, Volume= 0.068 af, Depth> 1.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.560 84 VRRM SPREADSHEET D.A. A 0.560 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 3S: Pre Area 5-1 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.560 ac Runoff Volume=0.068 af Runoff Depth>1.45" Tc=7.0 min CN=84 1.37 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 9HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Area 5-3 Runoff = 1.73 cfs @ 11.97 hrs, Volume= 0.085 af, Depth> 1.83" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 1-YR Rainfall=2.92" Area (ac) CN Description * 0.560 89 VRRM SPREADSHEET D.A. C 0.560 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 5S: Post Area 5-3 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)1 0 Type II 24-hr 1-YR Rainfall=2.92" Runoff Area=0.560 ac Runoff Volume=0.085 af Runoff Depth>1.83" Tc=6.0 min CN=89 1.73 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 10HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 4L: Areas Combined (Pre 5-1 + Pre 5-2) Inflow Area = 1.480 ac, 0.00% Impervious, Inflow Depth > 1.79" for 1-YR event Inflow = 3.66 cfs @ 12.01 hrs, Volume= 0.220 af Primary = 3.66 cfs @ 12.01 hrs, Volume= 0.220 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 4L: Areas Combined (Pre 5-1 + Pre 5-2) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Inflow Area=1.480 ac 3.66 cfs 3.66 cfs Type II 24-hr 1-YR Rainfall=2.92"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 11HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 6L: Areas Combined (Post 5-3 + Post 5-4) Inflow Area = 1.160 ac, 0.00% Impervious, Inflow Depth > 2.00" for 1-YR event Inflow = 3.25 cfs @ 11.99 hrs, Volume= 0.194 af Primary = 3.25 cfs @ 11.99 hrs, Volume= 0.194 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 6L: Areas Combined (Post 5-3 + Post 5-4) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Inflow Area=1.160 ac 3.25 cfs 3.25 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 12HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.920 ac 0.00% Impervious Runoff Depth>2.57"Subcatchment 1S: Pre Area 5-2 Tc=13.0 min CN=91 Runoff=3.16 cfs 0.197 af Runoff Area=0.600 ac 0.00% Impervious Runoff Depth>2.77"Subcatchment 2S: Post Area 5-4 Tc=13.0 min CN=93 Runoff=2.18 cfs 0.138 af Runoff Area=0.560 ac 0.00% Impervious Runoff Depth>1.97"Subcatchment 3S: Pre Area 5-1 Tc=7.0 min CN=84 Runoff=1.85 cfs 0.092 af Runoff Area=0.560 ac 0.00% Impervious Runoff Depth>2.39"Subcatchment 5S: Post Area 5-3 Tc=6.0 min CN=89 Runoff=2.24 cfs 0.112 af Inflow=4.77 cfs 0.289 afLink 4L: Areas Combined (Pre 5-1 + Pre 5-2) Primary=4.77 cfs 0.289 af Inflow=4.15 cfs 0.250 afLink 6L: Areas Combined (Post 5-3 + Post 5-4) Primary=4.15 cfs 0.250 af Total Runoff Area = 2.640 ac Runoff Volume = 0.539 af Average Runoff Depth = 2.45" 100.00% Pervious = 2.640 ac 0.00% Impervious = 0.000 ac Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 13HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pre Area 5-2 Runoff = 3.16 cfs @ 12.04 hrs, Volume= 0.197 af, Depth> 2.57" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.920 91 VRRM SPREADSHEET D.A. B 0.920 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.0 Direct Entry, Subcatchment 1S: Pre Area 5-2 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.920 ac Runoff Volume=0.197 af Runoff Depth>2.57" Tc=13.0 min CN=91 3.16 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 14HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Post Area 5-4 Runoff = 2.18 cfs @ 12.04 hrs, Volume= 0.138 af, Depth> 2.77" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.600 93 VRRM SPREADSHEET D.A. D 0.600 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.0 Direct Entry, Subcatchment 2S: Post Area 5-4 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.600 ac Runoff Volume=0.138 af Runoff Depth>2.77" Tc=13.0 min CN=93 2.18 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 15HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Pre Area 5-1 Runoff = 1.85 cfs @ 11.98 hrs, Volume= 0.092 af, Depth> 1.97" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.560 84 VRRM SPREADSHEET D.A. A 0.560 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 3S: Pre Area 5-1 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.560 ac Runoff Volume=0.092 af Runoff Depth>1.97" Tc=7.0 min CN=84 1.85 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 16HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Area 5-3 Runoff = 2.24 cfs @ 11.97 hrs, Volume= 0.112 af, Depth> 2.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 2-YR Rainfall=3.54" Area (ac) CN Description * 0.560 89 VRRM SPREADSHEET D.A. C 0.560 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 5S: Post Area 5-3 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)2 1 0 Type II 24-hr 2-YR Rainfall=3.54" Runoff Area=0.560 ac Runoff Volume=0.112 af Runoff Depth>2.39" Tc=6.0 min CN=89 2.24 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 17HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 4L: Areas Combined (Pre 5-1 + Pre 5-2) Inflow Area = 1.480 ac, 0.00% Impervious, Inflow Depth > 2.34" for 2-YR event Inflow = 4.77 cfs @ 12.01 hrs, Volume= 0.289 af Primary = 4.77 cfs @ 12.01 hrs, Volume= 0.289 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 4L: Areas Combined (Pre 5-1 + Pre 5-2) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)5 4 3 2 1 0 Inflow Area=1.480 ac 4.77 cfs 4.77 cfs Type II 24-hr 2-YR Rainfall=3.54"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 18HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 6L: Areas Combined (Post 5-3 + Post 5-4) Inflow Area = 1.160 ac, 0.00% Impervious, Inflow Depth > 2.59" for 2-YR event Inflow = 4.15 cfs @ 11.99 hrs, Volume= 0.250 af Primary = 4.15 cfs @ 11.99 hrs, Volume= 0.250 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 6L: Areas Combined (Post 5-3 + Post 5-4) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Inflow Area=1.160 ac 4.15 cfs 4.15 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 19HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Time span=0.00-24.00 hrs, dt=0.05 hrs, 481 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=0.920 ac 0.00% Impervious Runoff Depth>4.31"Subcatchment 1S: Pre Area 5-2 Tc=13.0 min CN=91 Runoff=5.15 cfs 0.331 af Runoff Area=0.600 ac 0.00% Impervious Runoff Depth>4.53"Subcatchment 2S: Post Area 5-4 Tc=13.0 min CN=93 Runoff=3.46 cfs 0.227 af Runoff Area=0.560 ac 0.00% Impervious Runoff Depth>3.59"Subcatchment 3S: Pre Area 5-1 Tc=7.0 min CN=84 Runoff=3.30 cfs 0.167 af Runoff Area=0.560 ac 0.00% Impervious Runoff Depth>4.10"Subcatchment 5S: Post Area 5-3 Tc=6.0 min CN=89 Runoff=3.73 cfs 0.192 af Inflow=8.04 cfs 0.498 afLink 4L: Areas Combined (Pre 5-1 + Pre 5-2) Primary=8.04 cfs 0.498 af Inflow=6.75 cfs 0.418 afLink 6L: Areas Combined (Post 5-3 + Post 5-4) Primary=6.75 cfs 0.418 af Total Runoff Area = 2.640 ac Runoff Volume = 0.916 af Average Runoff Depth = 4.16" 100.00% Pervious = 2.640 ac 0.00% Impervious = 0.000 ac Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 20HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pre Area 5-2 Runoff = 5.15 cfs @ 12.04 hrs, Volume= 0.331 af, Depth> 4.31" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.920 91 VRRM SPREADSHEET D.A. B 0.920 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.0 Direct Entry, Subcatchment 1S: Pre Area 5-2 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)5 4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.920 ac Runoff Volume=0.331 af Runoff Depth>4.31" Tc=13.0 min CN=91 5.15 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 21HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Post Area 5-4 Runoff = 3.46 cfs @ 12.04 hrs, Volume= 0.227 af, Depth> 4.53" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.600 93 VRRM SPREADSHEET D.A. D 0.600 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.0 Direct Entry, Subcatchment 2S: Post Area 5-4 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.600 ac Runoff Volume=0.227 af Runoff Depth>4.53" Tc=13.0 min CN=93 3.46 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 22HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 3S: Pre Area 5-1 Runoff = 3.30 cfs @ 11.98 hrs, Volume= 0.167 af, Depth> 3.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.560 84 VRRM SPREADSHEET D.A. A 0.560 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 3S: Pre Area 5-1 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.560 ac Runoff Volume=0.167 af Runoff Depth>3.59" Tc=7.0 min CN=84 3.30 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 23HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Area 5-3 Runoff = 3.73 cfs @ 11.96 hrs, Volume= 0.192 af, Depth> 4.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 10-YR Rainfall=5.35" Area (ac) CN Description * 0.560 89 VRRM SPREADSHEET D.A. C 0.560 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 5S: Post Area 5-3 Runoff Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)4 3 2 1 0 Type II 24-hr 10-YR Rainfall=5.35" Runoff Area=0.560 ac Runoff Volume=0.192 af Runoff Depth>4.10" Tc=6.0 min CN=89 3.73 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 24HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 4L: Areas Combined (Pre 5-1 + Pre 5-2) Inflow Area = 1.480 ac, 0.00% Impervious, Inflow Depth > 4.04" for 10-YR event Inflow = 8.04 cfs @ 12.01 hrs, Volume= 0.498 af Primary = 8.04 cfs @ 12.01 hrs, Volume= 0.498 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 4L: Areas Combined (Pre 5-1 + Pre 5-2) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)9 8 7 6 5 4 3 2 1 0 Inflow Area=1.480 ac 8.04 cfs 8.04 cfs Type II 24-hr 10-YR Rainfall=5.35"Keswick Hall_Analysis Point 5 (PRE-POST) Printed 4/29/2019Prepared by Timmons Group Page 25HydroCAD® 10.00-19 s/n 06538 © 2016 HydroCAD Software Solutions LLC Summary for Link 6L: Areas Combined (Post 5-3 + Post 5-4) Inflow Area = 1.160 ac, 0.00% Impervious, Inflow Depth > 4.33" for 10-YR event Inflow = 6.75 cfs @ 11.99 hrs, Volume= 0.418 af Primary = 6.75 cfs @ 11.99 hrs, Volume= 0.418 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 6L: Areas Combined (Post 5-3 + Post 5-4) Inflow Primary Hydrograph Time (hours) 2423222120191817161514131211109876543210Flow (cfs)7 6 5 4 3 2 1 0 Inflow Area=1.160 ac 6.75 cfs 6.75 cfs January 26, 2018 Mr. Andrew Allison Timmons Group 608 Preston Avenue, Suite 200 Charlottesville, VA 22903 RE: CBNLT / Oak Grove – Nutrient Credit Availability Project Reference: Keswick Hall and Golf Club Attention: Mr. Allison: This letter is to confirm the availability of authorized Nutrient Credits sufficient to meet your project requirements at our Oak Grove nutrient facility, which is registered with the Virginia Department of Environmental Quality (DEQ). These Nutrient Credits are generated and managed under the terms of the Oak Grove Nutrient Reduction Implementation Plan dated May 11, 2017 which was authorized by the DEQ on August 31, 2017. The Oak Grove project has been authorized to provide Nutrient Credits for use in the James River watershed. These Credits are transferable to those entities regulated under DEQ's Stormwater Management Program in accordance with VA Code § 62.1-44.15:35. Currently our Oak Grove facility has 38.16 pounds of Phosphorus Credits available. If we can provide further assistance please feel free to contact our office. Sincerely, Chesapeake Bay Nutrient Land Trust, LLC By Its Manager EarthSource Solutions, Inc. Scott A. Reed Scott A. Reed Vice President