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WPO202100046 Calculations 2021-08-12
Barnes Lumber ALBEMARLE COUNTY, VIRGINIA WPO PLAN DESIGN CALCULATIONS & NARRATIVE DECEMBER 16, 2020 REVISED .TUNE 28, 2021 •00000 i • TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. Prepared by: Clint Shifflett, PE Timmons Group 608 Preston Avenue, Suite 200 Charlottesville, VA 22903 434.327.1690 TH CLINT W. S FFLET > Lic. N 54380 Arl 6/28/2021 4AM AL Table of Contents Section Title 1. Project Narrative 2. LD-204 Inlet Calculations 3. LD-229 Pipe Calculations 4. LD-347 Hydraulic Grade Line Analysis 5. Pre -Developed HydroCAD Calculations 6. Post -Developed HydroCAD Calculations 7. Outlet Protection Sizing 8. Virginia Runoff Reduction Method Worksheet Summary Project Narrative: This project includes the construction of multiple roads, mixed use pad sites, associated utilities and landscaping. The project will be developed in multiple phases. Phase 1 will include the construction of 3 roads, rough grading and the stormwater management pond. The limits of disturbance for phase 1 is 18.64 acres. Water Quality: The current site is developed with multiple buildings and asphalt and concrete paving. The site was analyzed in the post development condition for the work to be done in Phase 1. Separate stormwater facilities will be provided for the future road work and the development of the parcels. The pre developed TP load is 20.78 lb/yr. The post developed TP load is 15.51 lb/yr. Due to reduction in impervious area, no further treatment is required. Water Quantity: The proposed stormwater conveyance system currently outfalls to 3 locations. Outfall 1 is the existing storm sewer system in Library Ave to the west. Outfall 2 is to an existing stream to the southeast. Outfall 3 is across the railroad tracks to the north. Each outfall was analyzed for the energy balance and 10-year storm individually. Outfall 1 and 3 meet the energy balance by a reduction in area resulting in a reduction in flow. A dry pond is proposed for Outfall 2 to detain the 1-year, 24-hour storm to meet the requirements of the energy balance equation for Outfall 2. Additionally, the 10-year, 24-hr storm is being detained to less than the pre -developed 10-year, 24-hour storm to meet flood protection requirements. FORM LD 400 STORMWATER INLET COMPUTATIONS SHEET OF ROUTE PROJECT CROZFTSOUARE DESIGNER: DATE mwmi CHECKED: UNITS'.NGLISH mmm�mmmomom��®���mm®mmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmommmmm�m�®mom m����m�mmmmmmmmmmmmmmmmmmmmmmmmm��m� m����mmmmmmmmmmmmmmmmmmmmmmmmmmm��m� ����mm�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomom��®���mm®mmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmommmmm�m�mtm� m���mm�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mm�o�ommmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmm��mm�mmmmmmmm©mm�mmmm�mtm ®����m�mmmmmmmmmmmmmmmmmmmmmmmmm��m� m���m��mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mm�omom��®���mm®mmmmmmmmmmm��m mmm�mmmmmmm��mmmmmmmmmmmommmm��m�mtm� m���mm�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mm�o�om��m���mm®mmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmmmm�mm���mt� m������mmmmmmmmmmmmmmmmmmmmmmmmm��m� INLETSOFT BY ENSOFTEC DATE: 6QSQ021 FORM LD 200 STORMWATER INLET COMPUTATIONS SHEET 2 OF ROUTE PROJECT CROZFTSOUARE DESIGNER: DATE S wmi CHECKED: UNITS'.NGLISH INLETSOFT BY ENSOFTEC DATE: 6QSQ021 FORM LD'100 STORMWATER INLET COMPUTATIONS SHEET 3 OF ROUTE PROJECT CROZFTSOUARE DESIGNER: DATE mwmi CHECKED: UNITS'.NGLISH mmm�mmmomom��®���mm®mmmmmmmmmmm��m mmm�mmmmmmm��mmmmmmmmmmmommmmmmm��m m����mmmmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomom��m���mm®mmmmmmmmmmm��m mmm�mmmmmmm��mmmmmmmmmmmomm�m�m���m m���mm�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomom��m���mm®mmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmomm�m®m��mt m������mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mm�omom��m���mm®mmmmmmmmmmm��m mmm����mmmmmmmmmmmmmmmmmmmmmmmmm��m0 mmm�mmmmo�ommmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmm��mmmmmmmmmmmmmm�mm���mtm �����m�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomom������mm®mmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmommmm�m���®� m������mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mmmomom��m���mm®mmmmmmmmmmm��m mmm�mmmmmmmm�mmmmmmmmmmmommmmmmm��m� m�m��m�mmmmmmmmmmmmmmmmmmmmmmmmm��m mmm�mm�omommmmmmmmmmmmmmmmmmmmm��m mmm�mmmmmmmm�mm�mmmmmmmm©mmmmmmm��m m���mm®mmmmmmmmmmmmmmmmmmmmmmmmm��m� mmm�mmm�omom�mm�mmmmmmmm�m�m��mm��m INLETSOFT BY ENSOFTEC DATE: 6QSQ021 38593-Prop_STRM STORM SEWER DESIGN COMPUTATIONS STORM FREQUENCY 10 PROJECT: Barnes LOCATION: COUNTY: A6emetle Designer) by: J. Denko Checked by: C. ShilfieN UNITS ENGDSN PIPE NO FROM POWT TOPOWT DRAW. AREA 'A' (3) RUNOFF COEFF. 'C' (A) CA TOTAL WLET TIME (]) RAW FALL RJEIr (8) RUNOFF Q CFS (9) BJVERTELEVATIONS LENGTH oFPipe Ft. (12) SLOPEESMES�E Ft/FLCFS (13)(15) Capacity Frlc Slope Ft/FL VEL Vn Ft/S. (16) FLOW TEME Min(1) (17) REMARKSMimIlea (18) WCRE- MEW (5) ACCIIM- ULATED (6) AD= CA UPPER END (10) LOWER END (11) REFERENCE STA. REFERENCE (2) STA. 101 102 WO 0000 0.000 0000 6.186 6.186 0.000 ].9W A9118 66A.000 663266 115938 O0M 114342 OWI 8.710 0220 309 310 308 0050 0.8W ON2 0062 0000 6.000 5608 0236 712.1% 711670 5Z025 0.010 15000 C. 6.A58 0.000 2501 0.3A7 307 309 306 0080 0.870 0070 0.112 0000 6.3A7 5519 0616 711.570 710.8W 73.024 0.010 15000 C. 6.A58 O.OW 3326 0366 305 3% 36A 0000 0000 0000 0.112 0000 6]13 5428 0606 710J40 7W MI 139.899 0.010 15000 C. 6.A58 0.10 3.309 0.705 303 306 3@ I 04W 0.523 0635 0000 7,417 5262 33W 709240 708.800 A0.000 0.010 18000 C. 10.502 0.001 5289 0.139 301 3M 2M 0220 0.no 0.180 0.915 0000 7.556 5231 426A 708J00 7080W 65.961 0.010 18000 C. 10.502 0.002 56A6 0.195 237 238 2M 0220 0.560 0.123 0.EU 0000 6.000 5W8 0691 713.529 713.309 43.999 O.WS 15000 C. 4.5W 0.000 2699 0273 235 236 232 O.mO 0.8M 0083 0206 0000 6273 5537 1142 713210 711.310 108037 0.018 15000 C. 8.566 0.000 4.862 0.370 233 234 232 0280 0.510 0.143 0.143 0000 6.000 5W8 0.801 711J50 711.310 A0.000 0.010 15000 C. 6.A58 0.000 35W 02N 231 232 2M 0090 0.8W 0.0]] 0426 0000 6.6A3 5AAA 2322 711210 7MM IW735 0.020 15000 C. 9A1 O.Wl 6223 0289 229 230 226 0000 0000 0000 12A2 0000 ].]51 5.188 6AA1 ]0].9W 7%Ng 217539 O.UO7 2A.000 C. 19589 0.001 5600 06A7 227 228 226 IOW 0470 0489 0489 0000 6,1W 5W8 2041 7W.800 7%580 43.998 O.U05 18000 Ctrs Z426 0.001 3.893 0.188 225 226 224 0.170 0.8W 0.143 1.803 0000 8.398 5050 9459 706.210 ]02.270 225.155 0.017 2A.000 C. 29923 0.002 8A63 0AA3 223 22A no 0.120 0.810 0097 Iwo 0000 8.8A1 4960 973 ]@.2]0 6"398 114.S69 0.025 2A.000 C. 35765 0.002 9719 0.197 221 222 no 0.850 0.510 04M 0434 0000 6,1W 5W8 2431 698.320 6W 880 43.999 0.010 18000 C. 10.502 0A01 4.8A5 0.151 219 220 218 O.mO 0.870 0087 2491 0000 9.038 4WI 12259 697J80 688.]]0 2W.235 0A38 2A.000 C. 43.8% O.W3 11,983 0.3M 217 218 214 0.130 0.8W 0.109 26W 0000 9.373 4857 12629 688670 682170 129%5 0A50 2A.000 C. 505W O.W3 13 W8 0.1@ 215 216 214 13W 0AW 0616 0616 0000 6,1W 5608 3456 6"w 683 W3 "A26 O.WO 15000 C. IZ916 0A03 8.935 0083 213 214 2W 0.110 0.8W 0095 3311 0000 9.53A 4827 15983 682.on 67.180 W997 O.W9 2A.000 C. 50068 O.WS 14.1% 0.119 211 212 200 04/0 0.350 0.165 0.165 0000 6,1W 5608 0922 677,SA5 6/6.191 63.932 0A21 15000 Ctrs 9.AW 0AW 4.881 0218 201 200 202B 0000 0000 0000 34/6 0000 9.651 4805 16WI 64.9W 6T2.517 88295 0A27 30000 C. 67M 0.002 11A74 0.128 205 206 2W O.mO 0.5W 0058 0058 0000 6,1W 5608 0325 674.952 6/4668 28.461 OA10 15000 C. 6.A58 0AW 2754 0.172 203 20A 2M 0050 0.850 00A3 0.101 0000 6.1T1 5563 0559 64.50 6/3.SW 102.906 OA10 15000 C. 64W 0.000 32M 0.530 209 210 208 1710 0.350 0.599 05W 0000 6.000 5W8 3356 6531 6/56A2 M6865 0A13 18000 C. 1L974 0A01 5.826 00]] 207 208 2M 03W 0600 0216 0.815 0000 6.0T1 5597 4551 650W 6/40W AAA27 0A22 18000 C.War 15353 0AM ]929 00% 201B 2M 202B 0000 0000 0000 0.915 0.000 6.]03 5430 4968 62.517 61714 35674 0A23 30000 Cl War 61555 0000 7545 2279 201A 202B 202A O.mO 0.800 0080 4471 0.000 %. o 4792 2137 6]0.110 666.000 1506/4 O.W1 30000 Ctraear 82761 OW3 14.191 0,7] A01 A02 A00 I I.IW 1 0.M0 I 0.3A2 1 0342 1 0000 1 6.000 1 5WS 1 1918 1 660.99A I 660.8% 1 19.3MA 1 O.UO7 1 12000 I Cvc Z999 1 0.003 1 4060 10.ON 503 506 5@ 4210 0.370 1,558 1559 0000 6.000 5W8 8935 6T/.597 666.8W 332T28 0.032 15000 Ctrs 11515 0.018 10 M51 O.SAA 501 502 500 0]90 0470 0.371 1W9 0000 6.SAA 5A69 10549 W,W 666.000 R742 0.035 15000 Ctrs 12023 0.027 110]8 0.120 38593-P.p STRM PROJECT: Bame3 DESIGNED BY: J. Denka HYDRAULIC GRADE LINE ANALYSIS Checked: C. Shiffle0 INCIDENCE PROBABILITY 10 Year INLET INLET OUTLET WATER OIA PIPE DESIGN DISGH, LENGTH PIPE FRICTION SLOPE. So, FRICTION LOSS JUNCTION LOSS FINAL Wet Wale, RI GOmmen% 5 OR STATION SURFACE DO CO LO If v0 H. OI VI OM wmg HI Angle IN HI l H sllmOe Elev JUNCTION ELEV. (F) ICES) (Fa (FT/FT) (F) (ED �kFAO'LSE (ED EIHa&n 102 666.47 48 49.12 115.94 0.12% 0.14 8.n 7 0 0 0 0 0 0 0 0.3 0.43 666.9 668.5 OK -1.6 202E 668.2 30 21.38 150.07 0.27% 0.41 14.17 0.78 16.7 11.47 191.62 2.04 0.72 91.67 1.43 2.93 0 FALSE 3.33 671.53 684 OK -12.46 200 674.52 30 16.7 88.3 0.17% 0.15 11.47 0.51 15.98 14.19 226.85 3.13 1.09 2.2 0 1.61 0 TRUE 0.95 6]5.4] 686.02 OK -10.55 214 6]8.]8 24 15.98 99.89 0.50% 0.5 14.19 0.78 12.63 13.41 169.33 2.79 0.98 87.55 0.87 2.63 0 TRUE 1.81 680.59 690.44 OK -9.85 218 683.77 24 12.63 129.94 0.31% 0.4 13.41 0.7 12.26 11.98 146.89 2.23 0.78 3.1 0 1.48 0 TRUE 1.14 664.91 695.75 OK -10.84 220 690.37 24 12.26 240.24 0.29% 0.71 11.98 0.56 9.n 9.72 94.99 1.47 0.51 92.17 0.26 1.33 0 TRUE 1.37 691.74 705.54 OK -13.8 224 701 24 9.n 114.87 0.19% 0.21 9.72 0.37 9.46 8.46 80.05 1.11 0.39 2.5 0 0.76 0 TRUE 0.59 701.59 709.52 OK -7.93 226 ]03.8] 24 9.46 225.16 0.17% 0.39 8.46 0.28 6.44 5.6 36.07 0.49 0.17 92.13 0.16 0.61 0 TRUE 0.7 ]04.5] 713.39 OK -8.82 230 ]0].91 24 6.44 217.54 0.08% 0.18 5.6 0.12 4.26 5.65 24.08 0.5 0.17 98.11 0.35 0.64 0 TRUE 0.5 708.41 716.58 OK -8.17 302 709.24 18 4.26 65.96 0.16% 0.11 5.65 0.12 3.34 529 1].6] 0.43 0.15 90 0.3 0.58 0.75 TRUE 0.49 ]09.]3 716.5 OK b.n 304 710 18 3.34 44 0.10% 0.04 529 0.11 0.61 3.31 2 0.17 0.06 86.66 0.12 0.29 0.37 TRUE 0.23 710.23 716.5 OK b.27 306 ]70.34 15 0.61 139.9 0.01% 0.01 3.31 0.04 0.62 3.33 2.05 0.1] 0.06 9].8] 0.12 0.22 0 TRUE 0.12 ]10.46 ]1].64 OK -].1] 308 ]71.84 15 0.62 ]3.02 0.01% 0.01 3.33 0.04 0.24 2.5 0.59 0.1 0.03 89.61 0.0] 0.14 0.19 TRUE 0.1 711.94 718.53 OK b.59 310 ]12.6] 15 0.24 52.02 0.00% 0 2.5 0.02 0 0 0 0 0 0 0 0.02 0.03 TRUE 0.02 ]12.69 718.53 OK -5.94 202 6]3.]1 30 1 4.97 1 35.67 1 0.01% 0.01 1 7.54 1 0.22 4.55 1 ].]3 1 35.17 0.93 1 0.32 1 75.06 1 0.61 1.16 1 0 1 TRUE 0.58 1 674.3 1 682.88 OK -8.58 204 1 1 674.54 1 15 1 0.56 1 102.9 1 0.01% 1 0.01 1 323 1 0.04 1 0.33 1 2.75 1 0.9 1 0.12 1 0.04 1 87.81 1 0.08 1 0.16 1 0.21 1 TRUE 1 0.11 1 674.65 1 679.93 OK -5.28 206 1 1 6]5.6] 1 15 1 0.33 1 28.46 1 0.00% 1 0 1 2.75 1 0.03 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0.03 1 0.04 1 TRUE 1 0.02 1 675.69 1 6]9.9] OK �99 208 675.24 18 4.55 44.43 0.19% 0.08 ].]3 0.23 3.36 5.83 19.55 0.53 0.18 45.84 0.26 0.68 0.88 TRUE 1 0.53 675.n 682.88 1 OK -].12 210 676.84 18 3.36 26.86 0.10% 0.03 5.83 0.13 0 0 0 0 0 0 0 0.13 0.17 TRUE 0.11 676.95 680.18 OK -3.23 212 1 1 6n.19 1 15 1 0.92 1 63.93 1 0.02% 1 0.01 1 4.88 1 0.09 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0.09 1 0.12 1 TRUE 1 0.07 1 6n.26 1 68].]6 OK -10.5 216 684.06 15 3.46 44.43 0.29% 0.13 8.93 0.31 0 0 0 0 0 0 0 0.31 0.4 TRUE 0.33 684.39 690.44 OK b.05 222 699.08 18 2.43 44 0.05% 0.02 4.85 0.09 0 0 0 0 0 0 0 0.09 0.12 TRUE 0.08 699.16 705.54 OK b.38 228 1 1 707.78 1 18 1 2.74 1 44 1 0.07% 1 0.03 1 3.89 1 0.06 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0.06 1 0.08 1 TRUE 1 0.07 1 ]0].85 1 713.39 OK -5.55 232 1 1 710.06 15 1 2.32 1107.741 0.13% 0.14 1 622 1 0.15 1.14 1 4.86 1 5.55 0.37 1 0.13 1 96.27 1 0.14 0.42 1 0 1 TRUE 0.35 1 710.41 1 ]18.]8 OK -8.37 236 1 1 712.31 1 15 1 1.14 1108.041 0.03% 1 0.03 1 4.86 1 0.09 1 0.69 1 2.69 1 1.86 1 0.11 1 0.04 1 90 1 0.08 1 021 1 0.27 1 TRUE 1 0.17 1 712.48 1 720.63 OK -8.15 238 1 1 714.31 1 15 1 0.69 1 44 1 0.01% 1 0.01 1 2.69 1 0.03 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0.03 1 0.04 1 TRUE 1 0.02 1 714.33 1 720.62 OK b.29 234 1 1 712.31 1 15 1 0.8 1 44 1 0.02% 1 0.01 1 3.59 1 0.05 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0.05 1 0.07 1 TRUE 1 0.04 1 712.35 1 ]18.]8 OK b.43 402 661.66 12 1.92 19.38 0.29% 0.06 4.06 0.06 0 1 0 1 0 1 0 1 0 1 0 1 0 0.06 0.08 FALSE 0.14 661.8 662.16 OK -0.36 502 668.2 15 10.55 ]9.]4 2.67% 2.13 11.08 0.48 8.73 1 10.35 1 90.36 1 1.66 1 0.58 1 84.62 1 1.1 2.15 0 TRUE 3.2 671.4 672.15 OK -0.]5 504 671.4 15 8.73 33].]3 1.83% 6.18 10.35 0.42 0 0 0 0 0 0 0 0.42 0.54 TRUE 6.45 WAS 684.44 OK b.59 Pre-DA1-West 2S Pre-DA2-Southeast Subcat Reach Aon Llnk Pre-DA3-North Pre -new Timmons NOAA 24-hr D 1-Year Rainfall=3.40" Printed 6/28/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre-DA1-West Runoff Area=2.250 ac 85.33% Impervious Runoff Depth>2.55" Tc=6.0 min CN=94 Runoff=6.54 cfs 0.478 of Subcatchment2S: Pre-DA2-Southeast Runoff Area=16.120 ac 34.18% Impervious Runoff Depth>1.28" Flow Length=1,214' Tc=13.3 min CN=78 Runoff=20.36 cfs 1.722 of Subcatchment3S: Pre-DA3-North Runoff Area=0.270 ac 37.04% Impervious Runoff Depth>1.11" Tc=6.0 min CN=75 Runoff=0.37 cfs 0.025 of Pre -new NOAA 24-hrD 1-Year Rainfall=3.40" Prepared by Timmons Group Printed 6/28/2021 Summary for Subcatchment 1S: Pre-DA1-West Runoff = 6.54 cfs @ 12.13 hrs, Volume= 0.478 af, Depth> 2.55" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 1-Year Rainfall=3.40" Area (ac) CN Description 1.920 98 Paved parking, HSG B 0.210 61 >75% Grass cover, Good, HSG B 0.120 80 >75% Grass cover, Good, HSG D 2.250 94 Weighted Average 0.330 14.67% Pervious Area 1.920 85.33% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 1S: Pre-DA1-West Hydrograph 6 0 s NOAA 2;4-hr D_ 6 1-Year Rainfall-3.4i0" 5 RunOff Areal=2.250rac- Ru noff', Votum0=0.478', of 4 Runoff Depth�-2.55" T'c=6.0 min 3 CN=94 1 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Pre -new NOAA 24-hr D 1-Year Rainfall=3.40" Timmons Summary for Subcatchment 2S: Pre-DA2-Southeast Runoff = 20.36 cfs @ 12.22 hrs, Volume= 1.722 af, Depth> 1.28" Printed 6/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 1-Year Rainfall=3.40" Area (ac) CN Description 0.730 98 Paved parking, HSG B 4.780 98 Paved parking, HSG D 4.110 61 >75% Grass cover, Good, HSG B 3.660 80 >75% Grass cover, Good, HSG D 1.910 55 Woods, Good, HSG B 0.930 77 Woods, Good, HSG D 16.120 78 Weighted Average 10.610 65.82% Pervious Area 5.510 34.18% Impervious Area Tc Length Slope Velocity Capacity Description 7.4 100 0.0300 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 0.7 122 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1 32 0.2180 7.52 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 1.7 378 0.0530 3.71 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.4 582 0.0370 2.83 11.04 Channel Flow, Area= 3.9 sf Perim= 11.2' r= 0.35' n= 0.050 13.3 1,214 Total Pre -new Timmons NOAA 24-hr D 1-Year Rainfall=3.40" Subcatchment 2S: Pre-DA2-Southeast Hydrograph Printed 6/28/2021 ---I----+----'----+----~---+------------+----~---------------+---- I I I I ■Runoff 22 _______r____________r____,____r___ --- ___r____r___r____r___--- ___r____ 21 ---- I ---- 1---- '____1__________2036!I____ NO r _ �" 19 / I I I I I I -------------:----;---��---,--- I I I 18 - ---III----T1--Year kairfa11T34�A"-- 17 ___ J____1____ I____ 1____I____J__. __I___-i ___LL---_ JLr____ �___J!y�_w/_A/_�__ RUnnoffAte&I6.'�20-ac 16 --- I ---- +---- I ---- 4----~___+--- _- ___ __, _fFW�tWl 14 ---J--------_�____,_____ V��u tP---1-1,7-LL� of 13 ___L_ _ L___�{ __i__{�J�_ ��i��jj 12 -� -+ -I -, -I -+- RU_Un_a-L D�t�l__ .8 r- 0 11 --- I I I LL 10 ___ -____ ---- ----I ----L--- - -----F[biN-f�en�tf>� �4T- 8 --- r-------r--- -I-- ______ "r- _"f 7 I --- J------------L--------L-- ---- L---- L---L---- L--- tN=19 _ i 6 I T 4 _________ --- 3 - ------ I--------'----L---L- -L--- _---L- Y 5 6 7 8 9 10 11 12 13 Time (hours) Pre -new Timmons NOAA 24-hr D 1-Year Rainfall=3.40" Summary for Subcatchment 3S: Pre-DA3-North Runoff = 0.37 cfs @ 12.14 hrs, Volume= 0.025 af, Depth> 1.11" Printed 6/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 1-Year Rainfall=3.40" Area (ac) CN Description 0.100 98 Paved parking, HSG D 0.170 61 >75% Grass cover, Good, HSG B 0.270 75 Weighted Average 0.170 62.96% Pervious Area 0.100 37.04% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: Pre-DA3-North 0.4 I 03]cfs 0.36 .--J----'�---J--------J----�- -------------NQAA21ff D 0.34 --------'r--------*---7----r-- ---r---1=tarflLai11TJ.u- 0.32 0.3 _--r ----r- - r----r---r----I ---,---1- -r---wi__-w--r-/_�--r- -r--- --r-- RYn6ff Am �V.27V c 0.28 ��__ - ��___ ��__ ---1---- I- - I - -- I---_'1_pI--/_�_I--A_C_I-__ 0.26 �, --- '�,----'�,-- - '�,----'�,---- '�,---- -- ---ilia iDffVAO 1p ••Y=i{��.02- J'}a# 0.24 "--J----� i------- J - - - -; 02 -- --,--------r-------Tb=8lIImin 0.18 0.16 --------r- ------r--------r-- --r--------r--------r---PN450.12 0.14 0.08 0.06 1 0.04---r----r- r----r-----r--- --r--- -------r---- 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runoff Pre -new Timmons NOAA 24-hr D 5-Year Rainfall=5.20" Printed 6/28/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre-DA1-West Runoff Area=2.250 ac 85.33% Impervious Runoff Depth>4.18" Tc=6.0 min CN=94 Runoff=10.43 cfs 0.783 of Subcatchment2S: Pre-DA2-Southeast Runoff Area=16.120 ac 34.18% Impervious Runoff Depth>2.64" Flow Length=1,214' Tc=13.3 min CN=78 Runoff=41.71 cfs 3.543 of Subcatchment3S: Pre-DA3-North Runoff Area=0.270 ac 37.04% Impervious Runoff Depth>2.39" Tc=6.0 min CN=75 Runoff=0.80 cfs 0.054 of Pre -new NOAA 24-hr D 5-Year Rainfall=5.20" Prepared by Timmons Group Printed 6/28/2021 Summary for Subcatchment 1S: Pre-DA1-West Runoff = 10.43 cfs @ 12.13 hrs, Volume= 0.783 af, Depth> 4.18" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 5-Year Rainfall=5.20" Area (ac) CN Description 1.920 98 Paved parking, HSG B 0.210 61 >75% Grass cover, Good, HSG B 0.120 80 >75% Grass cover, Good, HSG D 2.250 94 Weighted Average 0.330 14.67% Pervious Area 1.920 85.33% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 1S: Pre-DA1-West Hydrograph ❑ Runoff m ig 3 N LL 5 _L _J a 3 ~ ~ NOAA 24-hr D ---5-rear Rainfa&: 20' _ - --RunotArea=2.250'ac - -';1Zu Ooff;`Vo jumO=O-.;783' of - Runot Depth;*41,8W - --- Tc=6'.-0-n tr-- -----------------'---- 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre -new NOAA 24-hr D 5-Year Rainfall=5.20" Timmons Summary for Subcatchment 2S: Pre-DA2-Southeast Runoff = 41.71 cfs @ 12.21 hrs, Volume= 3.543 af, Depth> 2.64" Printed 6/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 5-Year Rainfall=5.20" Area (ac) CN Description 0.730 98 Paved parking, HSG B 4.780 98 Paved parking, HSG D 4.110 61 >75% Grass cover, Good, HSG B 3.660 80 >75% Grass cover, Good, HSG D 1.910 55 Woods, Good, HSG B 0.930 77 Woods, Good, HSG D 16.120 78 Weighted Average 10.610 65.82% Pervious Area 5.510 34.18% Impervious Area Tc Length Slope Velocity Capacity Description 7.4 100 0.0300 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 0.7 122 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1 32 0.2180 7.52 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 1.7 378 0.0530 3.71 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.4 582 0.0370 2.83 11.04 Channel Flow, Area= 3.9 sf Perim= 11.2' r= 0.35' n= 0.050 13.3 1,214 Total Pre -new Timmons NOAA 24-hr D 5-Year Rainfall=5.20" Subcatchment 2S: Pre-DA2-Southeast Hydrograph Printed 6/28/2021 46 ------ - - - - -- -- - - - - -i--- - - - --- ----+----I ---- +---- _______________+---_�___�____�____�____'____ - -; ------------i---------i------------- Runoff 44 I ___,____T____� ___T____r _i_ 4V1cfs 1 1 i____T___T____T____i____T____ 42 ---J____ L____I____1---- L___J___. 1 1 1 -- 11----L___NOAA-�t. 1_D_ 1 1 1 ■,C■rpr^p n 38 _________________7____�r___Ji__. _�i____ iza'Kr�rrTr2w 36----L----L---L--- I I I 1 1 1 --' _t S, r _ 1 1 1 1 1 1 1 34 ___y____+____,____+____r____i__. _ � __ +____ f Atrd&1S.'IZQTa� 32 --- --- ___r____�____7____�T___,___ _Rpmo _ 30 - -- j____!____ILL---L___ _i__ _ L-- i543,af_ I 43,a 28 -y -t _, _' r -y �t�tOff�' Q�UMQ-3_:l _ .� 26 1 -1 -T -r -T -r -T -T R6noff Dqpth�_Z-.64_`_F_ 24 ____L___J___ __i____1___ 0 22 - I I I 1 1 1 -- - --- - ----- --- - -- ----1 --- 1- 1 1 1 1 1 1 1 ----+-FIO Len th�fi21 -_ LL 20 _l _T _r _T _I _I _I -T -r -T -1 -j-T 16 ---J--------;-------1L---L1-- ---- -L1--------1L---L1-To-13'�3--jin-_- 16 ---"---------'----+--------�-- ------+----�---�--�----�-- - 14 Tr``]J --_T--__r ____1____r-�-NF:l 12 J J J i I 1 I ----r- - - -r r r r T- I I I T----r-------1 1 1 g ___J____L____I__ 1 1 _J_ 1 1 1 __L___ 1 1____-L 1 1 1 1 1 1 1 1 1 Time (hours) Pre -new Timmons NOAA 24-hr D 5-Year Rainfall=5.20" Summary for Subcatchment 3S: Pre-DA3-North Runoff = 0.80 cfs @ 12.13 hrs, Volume= 0.054 af, Depth> 2.39" Printed 6/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 5-Year Rainfall=5.20" Area (ac) CN Description ' 0.100 98 Paved parking, HSG D 0.170 61 >75% Grass cover, Good, HSG B 0.270 75 Weighted Average 0.170 62.96% Pervious Area 0.100 37.04% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, 12 Subcatchment 3S: Pre-DA3-North Hydrograph I I I I I -------- -------- --- ----- I I I I I I III III III -- ----III I --- ----III --- --- I L_ _J____L__-J____ I I I I I I I____}____I____r____I____}____ ■Runoff I I I I I I ------ NOAA 24-hr D - 5-Year Rainfall=5.20' Runoff Area=0.270 ac Runoff Vo1ume=O.p54,af_ Runoff Delpt"2.39' I I I I - --- --- --- t_ mtn_ - - -- I I I I I I I N7- - r____I r____I r___ I CA--r5 --------------------- I I I I I I I I I I I I I I I I I I I I I 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre -new Timmons NOAA 24-hr D 10-Year Rainfall=6.20" Printed 6/28/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre-DA1-West Runoff Area=2.250 ac 85.33% Impervious Runoff Depth>5.08" Tc=6.0 min CN=94 Runoff=12.57 cfs 0.952 of Subcatchment2S: Pre-DA2-Southeast Runoff Area=16.120 ac 34.18% Impervious Runoff Depth>3.45" Flow Length=1,214' Tc=13.3 min CN=78 Runoff=54.16 cfs 4.639 of Subcatchment3S: Pre-DA3-North Runoff Area=0.270 ac 37.04% Impervious Runoff Depth>3.17" Tc=6.0 min CN=75 Runoff=1.06 cfs 0.071 of Pre -new Timmons NOAA 24-hr D 10-Year Rainfall=6.20" Summary for Subcatchment 1S: Pre-DA1-West Runoff = 12.57 cfs @ 12.13 hrs, Volume= 0.952 af, Depth> 5.08" Printed 6/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=6.20" Area (ac) CN Description 1.920 98 Paved parking, HSG B 0.210 61 >75% Grass cover, Good, HSG B 0.120 80 >75% Grass cover, Good, HSG D 2.250 94 Weighted Average 0.330 14.67% Pervious Area 1.920 85.33% Impervious Area Tc Length Capacity Description Direct Entry, Subcatchment 1S: Pre-DA1-West Hydrograph 1 I 1 I 0 _Y_ ear f_a_inf_a_1_fr_&.20_`_'_- I —♦ —F —y —4 —I —J Runbff Ares=2.250 'ac ------- ---'1Ru�toff,-Volump=0-1957-af-- -----i RunaffDepth;o&08"-- 6-0 Min - 1 1 —T N= 4 --1----1----L---J----L----1----1-——— 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Pre -new NOAA 24-hr D 10-Year Rainfall=6.20" Timmons Summary for Subcatchment 2S: Pre-DA2-Southeast Runoff = 54.16 cfs @ 12.21 hrs, Volume= 4.639 af, Depth> 3.45" Printed 6/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=6.20" Area (ac) CN Description 0.730 98 Paved parking, HSG B 4.780 98 Paved parking, HSG D 4.110 61 >75% Grass cover, Good, HSG B 3.660 80 >75% Grass cover, Good, HSG D 1.910 55 Woods, Good, HSG B 0.930 77 Woods, Good, HSG D 16.120 78 Weighted Average 10.610 65.82% Pervious Area 5.510 34.18% Impervious Area Tc Length Slope Velocity Capacity Description 7.4 100 0.0300 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 0.7 122 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1 32 0.2180 7.52 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 1.7 378 0.0530 3.71 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.4 582 0.0370 2.83 11.04 Channel Flow, Area= 3.9 sf Perim= 11.2' r= 0.35' n= 0.050 13.3 1,214 Total Pre -new Timmons NOAA 24-hr D 10-Year Rainfall=6.20" Subcatchment 2S: Pre-DA2-Southeast Hydrograph Printed 6/28/2021 --------- ---- I I --- NOAA-�44 hrz- 10-Year- RWnfaW--& 2A"-- RUnoff Atea-16.120-ac - --upoffl,LVourrte=4.116-39;af - -----t-Runoff Depth?&.45"- --- -Flow Lerfirl-,214'-- --,---- ---,I Tc=1311,3-rjirr- I �`{Q I I Time (hours) ■ Runoff Pre -new NOAA 24-hr D 10-Year Rainfall=6.20" Prepared by Timmons Group Printed 6/28/2021 LJ...1.. AM4n nn nC ..1.. nOCCO /l nA4n LJ...1.. All C..p........ C..I..I:...... I I !` rl--- AC Summary for Subcatchment 3S: Pre-DA3-North Runoff = 1.06 cfs @ 12.13 hrs, Volume= 0.071 af, Depth> 3.17" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=6.20" Area (ac) CN Description 0.100 98 Paved parking, HSG D 0.170 61 >75% Grass cover, Good, HSG B 0.270 75 Weighted Average 0.170 62.96% Pervious Area 0.100 37.04% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, 1 Subcatchment 3S: Pre-DA3-North Hydrograph NOAA 24-hr D 10-Year Rainfall=6.20" Runoff Area=0.270 ac Runoff Volume=0.071 of Runoff Depth>3.17" Tc=6.0 min CN=75 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ❑ Runoff Pre -new Timmons NOAA 24-hr D 100-Year Rainfall= 10. 10" Printed 6/28/2021 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment1S: Pre-DA1-West Runoff Area=2.250 ac 85.33% Impervious Runoff Depth>8.58" Tc=6.0 min CN=94 Runoff=20.84 cfs 1.610 of Subcatchment2S: Pre-DA2-Southeast Runoff Area=16.120 ac 34.18% Impervious Runoff Depth>6.83" Flow Length=1,214' Tc=13.3 min CN=78 Runoff=103.67 cfs 9.173 of Subcatchment3S: Pre-DA3-North Runoff Area=0.270 ac 37.04% Impervious Runoff Depth>6.47" Tc=6.0 min CN=75 Runoff=2.08 cfs 0.146 of Pre -new Timmons NOAA 24-hr D 100-Year Rainfall= 10. 10" Summary for Subcatchment 1S: Pre-DA1-West Runoff = 20.84 cfs @ 12.13 hrs, Volume= 1.610 af, Depth> 8.58" Printed 6/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=10.10" Area (ac) CN Description 1.920 98 Paved parking, HSG B 0.210 61 >75% Grass cover, Good, HSG B 0.120 80 >75% Grass cover, Good, HSG D 2.250 94 Weighted Average 0.330 14.67% Pervious Area 1.920 85.33% Impervious Area Tc Length Capacity Description 6.0 Direct Entry, Subcatchment 1S: Pre-DA1-West Hydrograph 23 --------'-------------F----------------------F---F---------I--------- 22 --- ---T----i ----I ---I----T----i ----I----i----I----i --- ,---- T---T �20.8t cfa 21 ---J____i--------L----L---L--- _-------L ---- L--- I NA7►irI���_Y_ I SJL7L1 1 I ---------------7----I ----I---- ==I1=00rYearRa1nfWJFiOF10"- 16 I ___l____T____1---T----I I I I I I I I I 15 --- ------------1---- ,I---L,-----I,RunoffLVofume=l.640'aT14- w 13 I ---,----T-------,----L -- , V .� 12 ' _J _1 _I _1 _L _J __ _ I _1 Runoff Depth>8.58" 3 0 11 i -------+---- Tc=6.0 min LL 10 9 J _1 _I _1 _L _J__ _1 ----L. 'II---------'F-------- PN=;94- 8 -----------------;----'F--------- 7 - ---'--- '---- - --- -I ---'--- --------T- I I I I '---------'-------'--- '--- I 6 ---J----1---- 1---- 1----L---J- I I I --1----1---- L--- J----L---- 1----1--- I I I I I I I 3 ---i----L---L----L---L ---L ---L----L---L----L----I----L--- 12 13 14 15 16 17 18 19 20 Time (hours) ■ Runofi Pre -new NOAA 24-hr D 100-Year Rainfall= 10. 10" Timmons Summary for Subcatchment 2S: Pre-DA2-Southeast Runoff = 103.67 cfs @ 12.21 hrs, Volume= 9.173 af, Depth> 6.83" Printed 6/28/2021 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=10.10" Area (ac) CN Description 0.730 98 Paved parking, HSG B 4.780 98 Paved parking, HSG D 4.110 61 >75% Grass cover, Good, HSG B 3.660 80 >75% Grass cover, Good, HSG D 1.910 55 Woods, Good, HSG B 0.930 77 Woods, Good, HSG D 16.120 78 Weighted Average 10.610 65.82% Pervious Area 5.510 34.18% Impervious Area Tc Length Slope Velocity Capacity Description 7.4 100 0.0300 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 0.7 122 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1 32 0.2180 7.52 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 1.7 378 0.0530 3.71 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.4 582 0.0370 2.83 11.04 Channel Flow, Area= 3.9 sf Perim= 11.2' r= 0.35' n= 0.050 13.3 1,214 Total Pre -new NOAA 24-hr D 100-Year Rainfa/h-10.10" Prepared by Timmons Group Printed 6/28/2021 HydroCAD0 10.00-25 s/n 08663 02019 HydroCAD Software Solutions LLC Page 20 Subcatchment 2S: Pre-DA2-Southeast Hydrograph 115 --- ---- ----'------------`----'----'----'---- --- ---------- --- ---- --- ---- r----r-----r---r---r--r---- ■Runoff 110 � ________!____L 1036]cfs I I I 17]�'� I I 105 ___1----I----'_____ ___'--------'---NOO-2'rl9J�_�_ 100 �I,�7� ___-____r___ -,___. ._7__}_�_,_�_y__-___Jr 95- n 90 ___�____�___ i___. ._�0Y-T_l ear_ftjnfa 1 10 O'_- 85 . i i i i 1 1 RurtoffAtea=ISA20lac_ ___J____L____,____L___J____1__- 75 ---a - 70 ---7----r--------`--- IuYIUJJ'YOl 65 60 �,------- '--------------- I- RuiMO DOpflt 50 ' ----F flowL4en h 't,214'- y r----I ----I- -- 45 'Co, 40 -- , r _ F3_MIrt _ 35 ___'__ r - 30 ___�____L____� !.___i____i_ �_ i____i____�____ �___�____ ___�____ _-- 1 ---- L _- -- 15 ___ �____-__. .____i 1 i 1 1 12 13 Time (hours) Pre -new NOAA 24-hr D 100-Year Rainfall= 10. 10" Prepared by Timmons Group Printed 6/28/2021 Summary for Subcatchment 3S: Pre-DA3-North Runoff = 2.08 cfs @ 12.13 hrs, Volume= 0.146 af, Depth> 6.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=10.10" Area (ac) CN Description 0.100 98 Paved parking, HSG D 0.170 61 >75% Grass cover, Good, HSG B 0.270 75 Weighted Average 0.170 62.96% Pervious Area 0.100 37.04% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: Pre-DA3-North Hydrograph ❑ Runoff 2 NOAA 24-hr D 100-Year Rainfall=10.10" Runoff Area=0.270 ac Runoff Volume=0.146 of Riiinnff r)anfh�>A A7" LL 111 rU Tc=6.0 min CN=75 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 1S 2S 3S 4S Post -West road) post- at (parcels) post-Southe t (road) Post outheast arcels) 5L 6L Post -West Post-Sout ast 7P SWM \ Total SE Subcat Reach Aon Llnk ad) Post -new NOAA 24-hr D 1-Year Rainfall=3.40" Prepared by Timmons Group Printed 7/1/2021 HVdroCAD® 10.00-25 s/n 08663 © 2019 HVdroCAD Software Solutions LLC Paae 2 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 Subcatchment 1S: Post -West (road) Runoff Area=0.260 ac 84.62% Impervious Runoff Depth>2.54" Tc=6.0 min CN=92 Runoff=0.72 cfs 0.055 of Subcatchment 2S: Post -West (parcels) Runoff Area=0.820 ac 0.00% Impervious Runoff Depth>1.49" Tc=6.0 min CN=79 Runoff=1.39 cfs 0.102 of Subcatchment 3S: Post -Southeast (road) Runoff Area=5.940 ac 49.66% Impervious Runoff Depth>2.01" Tc=9.1 min CN=86 Runoff=12.17 cfs 0.993 of Subcatchment 4S: Post -Southeast (parcels) Runoff Area=9.580 ac 0.00% Impervious Runoff Depth>1.11" Flow Length=875' Tc=10.5 min CN=73 Runoff=10.01 cfs 0.886 of Subcatchment 7S: Post -Southeast (road, Runoff Area=1.820 ac 15.93% Impervious Runoff Depth>1.05" Tc=6.0 min CN=72 Runoff=2.12 cfs 0.160 of Subcatchment 9S: Post -Southeast (parcels, Runoff Area=0.210 ac 0.00% Impervious Runoff Depth>0.53" Flow Length=1,420' Tc=11.6 min CN=61 Runoff=0.08 cfs 0.009 of Pond 7P: SWM Peak Elev=666.31' Storage=14,470 cf Inflow=21.95 cfs 1.879 of Outflow=10.75 cfs 1.850 of Link 5L: Post -West Inflow=2.11 cfs 0.157 of Primary=2.11 cfs 0.157 of Link 6L: Post -Southeast Inflow=21.95 cfs 1.879 of Primary=21.95 cfs 1.879 of Link 10L: Total SE Inflow=11.60 cfs 2.019 of Primary=11.60 cfs 2.019 of Post -new Prepared by Timmons G NOAA 24-hr D 1-Year Rainfall=3.40" Printed 7/1/2021 Summary for Subcatchment 1 S: Post -West (road) Runoff = 0.72 cfs @ 12.13 hrs, Volume= 0.055 af, Depth> 2.54" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 1-Year Rainfall=3.40" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.040 61 >75% Grass cover, Good, HSG B 0.260 92 Weighted Average 0.040 15.38% Pervious Area 0.220 84.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Post -West (road) Hydrograph ■ Rurwff 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 1-Year Rainfall=3.40" Printed 7/1/2021 Summary for Subcatchment 2S: Post -West (parcels) Runoff = 1.39 cfs @ 12.13 hrs, Volume= 0.102 af, Depth> 1.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 1-Year Rainfall=3.40" Area (ac) CN 0.760 80 0.060 61 0.820 79 Weighted Average 0.820 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Post -West (parcels) Hydrograph ■ Rurwff Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 1-Year Rainfall=3.40" Printed 7/1/2021 Summary for Subcatchment 3S: Post -Southeast (road) Runoff = 12.17 cfs @ 12.16 hrs, Volume= 0.993 af, Depth> 2.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 1-Year Rainfall=3.40" Area (ac) CN Description 1.160 98 Paved parking, HSG B 1.790 98 Paved parking, HSG D 0.820 61 >75% Grass cover, Good, HSG B 2.170 80 >75% Grass cover, Good, HSG D 5.940 86 Weighted Average 2.990 50.34% Pervious Area 2.950 49.66% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.1 Direct Entry, From Pipe Calcs 13_ 12 11 10 9 8 w 7 0 LL 6 5 4 3 2 1 Subcatchment 3S: Post -Southeast (road) Hydrograph off Vol - 0.993 I Tc=9.1 min■■ II CN=86 �/ ■n■ ■■■■■■■■■■ ■■■■■■■■■■ ■■■■■■■■■■ ■■■■■■■■■■ ■■■■■■■■■■ ■■■■■■■■■■ ■■■■■■■■■■ 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Rurwff Post -new Prepared by Timmons G NOAA 24-hr D 1-Year Rainfall=3.40" Printed 7/1/2021 Summary for Subcatchment 4S: Post -Southeast (parcels) Runoff = 10.01 cfs @ 12.19 hrs, Volume= 0.886 af, Depth> 1.11" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 1-Year Rainfall=3.40" Area (ac) CN Description 3.450 61 >75% Grass cover, Good, HSG B 6.130 80 >75% Grass cover, Good, HSG D 9.580 73 Weighted Average 9.580 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.4 100 0.0300 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 0.9 154 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 2.2 621 0.0330 4.69 15.01 Channel Flow, Area= 3.2 sf Perim= 8.5' r= 0.38' n= 0.030 10.5 875 Total 11 10 9 8 4 CA 2 Subcatchment 4S: Post -Southeast (parcels) Hydrograph I - • - • II Flow Length=876' ' 1/ ■■■ ■■■■■■■■■■ ■■■■■■■■■■ ■M■■■■■■■■ ■■■■■■■■■■ _ mioiiiiiiiii�IEN Time (houm) ■ Rurwff Post -new Prepared by Timmons G NOAA 24-hr D 1-Year Rainfall=3.40" Printed 7/1/2021 Summary for Subcatchment 7S: Post -Southeast (road, undetained) Runoff = 2.12 cfs @ 12.14 hrs, Volume= 0.160 af, Depth> 1.05" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 1-Year Rainfall=3.40" Area (ac) CN Description 0.220 98 Paved parking, HSG B ' 0.070 98 Paved parking, HSG D 1.020 61 >75% Grass cover, Good, HSG B 0.510 80 >75% Grass cover, Good, HSG D 1.820 72 Weighted Average 1.530 84.07% Pervious Area 0.290 15.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, 2 LL 1 Subcatchment 7S: Post -Southeast (road, undetained) Hydrograph ��111 � r I 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Tim (hours) ■ Rurwff Post -new Prepared by Timmons G NOAA 24-hr D 1-Year Rainfall=3.40" Printed 7/1/2021 Summary for Subcatchment 9S: Post -Southeast (parcels, undetained) Runoff = 0.08 cfs @ 12.22 hrs, Volume= 0.009 af, Depth> 0.53" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 1-Year Rainfall=3.40" Area (ac) CN 0.210 61 >75% Grass cover, Good, HSG B 0.210 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.1 100 0.0746 0.33 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 3.3 667 0.0430 3.34 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.2 653 0.0200 3.41 27.59 Channel Flow, Area= 8.1 sf Perim= 11.1' r= 0.73' n= 0.050 11.6 1,420 Total Subcatchment 9S: Post -Southeast (parcels, undetained) Hydrograph ■ Rurwff Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 1-Year Rainfall=3.40" Summary for Pond 7P: SWM Printed 7/1/2021 Inflow Area = 15.520 ac, 19.01 % Impervious, Inflow Depth > 1.45" for 1-Year event Inflow = 21.95 cfs @ 12.17 hrs, Volume= 1.879 of Outflow = 10.75 cfs @ 12.36 hrs, Volume= 1.850 af, Atten= 51%, Lag= 10.9 min Primary = 10.75 cfs @ 12.36 hrs, Volume= 1.850 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 666.31' @ 12.36 hrs Surf.Area= 7,442 sf Storage= 14,470 cf Plug -Flow detention time= 25.9 min calculated for 1.850 of (98% of inflow) Center -of -Mass det. time= 17.3 min ( 869.6 - 852.4 ) Volume Invert Avail.Storage Storage Description #1 664.00' 62,006 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 664.00 5,147 0 0 665.00 6,102 5,625 5,625 666.00 7,114 6,608 12,233 667.00 8,182 7,648 19,881 668.00 9,307 8,745 28,625 669.00 10,489 9,898 38,523 670.00 11,727 11,108 49,631 671.00 13,022 12,375 62,006 Device Routing Invert Outlet Devices #1 Primary 664.00' 54.0" Round Culvert L= 115.9' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 664.00' / 663.27' S= 0.0063 '/' Cc= 0.900 n= 0.013, Flow Area= 15.90 sf #2 Device 1 664.00' 20.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 #3 Device 1 667.65' 17.3' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Z�Primary OutFlow Max=10.75 cfs @ 12.36 hrs HW=666.30' (Free Discharge) _Cu (Passes 10.75 cfs of 38.18 cfs potential flow) �2=Orifice/Grate (Orifice Controls 10.75 cfs @ 6.45 fps) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Post -new Prepared by Timmons Pond 7P: SWM Hydrograph Tim (hours) NOAA 24-hr D 1-Year Rainfall=3.40" Printed 7/l/2021 ■ h fim— ■ Primary Post -new Prepared by Timmons G Elevation Primary (feet) (cfs) 664.00 0.00 664.04 0.01 664.08 0.04 664.12 0.10 664.16 0.19 664.20 0.31 664.24 0.46 664.28 0.63 664.32 0.83 664.36 1.07 664.40 1.33 664.44 1.56 664.48 1.78 664.52 2.01 664.56 2.24 664.60 2.49 664.64 2.74 664.68 3.00 664.72 3.27 664.76 3.54 664.80 3.83 664.84 4.12 664.88 4.42 664.92 4.72 664.96 5.03 665.00 5.35 665.04 5.63 665.08 5.88 665.12 6.12 665.16 6.34 665.20 6.55 665.24 6.76 665.28 6.95 665.32 7.15 665.36 7.33 665.40 7.51 665.44 7.68 665.48 7.85 665.52 8.02 665.56 8.18 665.60 8.34 665.64 8.50 665.68 8.65 665.72 8.80 665.76 8.95 665.80 9.09 665.84 9.23 665.88 9.37 665.92 9.51 665.96 9.65 666.00 9.78 666.04 9.91 NOAA 24-hr D 1-Year Rainfall=3.40" Stage -Discharge for Pond 7P: SWIM Elevation Primary (feet) (cfs) 666.08 10.04 666.12 10.17 666.16 10.30 666.20 10.42 666.24 10.55 666.28 10.67 666.32 10.79 666.36 10.91 666.40 11.03 666.44 11.15 666.48 11.26 666.52 11.38 666.56 11.49 666.60 11.60 666.64 11.71 666.68 11.82 666.72 11.93 666.76 12.04 666.80 12.15 666.84 12.25 666.88 12.36 666.92 12.46 666.96 12.56 667.00 12.67 667.04 12.77 667.08 12.87 667.12 12.97 667.16 13.07 667.20 13.17 667.24 13.27 667.28 13.36 667.32 13.46 667.36 13.55 667.40 13.65 667.44 13.74 667.48 13.84 667.52 13.93 667.56 14.02 667.60 14.11 667.64 14.21 667.68 14.59 667.72 15.43 667.76 16.54 667.80 17.84 667.84 19.33 667.88 20.96 667.92 22.74 667.96 24.64 668.00 26.67 668.04 28.80 668.08 31.04 668.12 33.39 Elevation Primary (feet) (cfs) 668.16 35.82 668.20 38.35 668.24 40.97 668.28 43.67 668.32 46.46 668.36 49.32 668.40 52.26 668.44 55.28 668.48 58.37 668.52 61.52 668.56 64.75 668.60 68.05 668.64 71.41 668.68 74.83 668.72 78.31 668.76 81.86 668.80 85.47 668.84 89.14 668.88 92.86 668.92 96.64 668.96 100.47 669.00 104.36 669.04 108.31 669.08 112.30 669.12 116.35 669.16 120.45 669.20 124.60 669.24 128.80 669.28 133.05 669.32 136.43 669.36 137.47 669.40 138.48 669.44 139.46 669.48 140.42 669.52 141.33 669.56 142.21 669.60 143.06 669.64 143.85 669.68 144.60 669.72 145.30 669.76 145.93 669.80 146.50 669.84 146.98 669.88 147.36 669.92 147.59 669.96 147.60 670.00 146.61 670.04 147.92 670.08 149.22 670.12 150.50 670.16 151.78 670.20 153.04 Printed 7/1/2021 Elevation Primary (feet) (cfs) 670.24 154.30 670.28 155.54 670.32 156.78 670.36 158.00 670.40 159.22 670.44 160.42 670.48 161.62 670.52 162.81 670.56 163.99 670.60 165.16 670.64 166.32 670.68 167.48 670.72 168.62 670.76 169.76 670.80 170.89 670.84 172.02 670.88 173.14 670.92 174.25 670.96 175.35 671.00 176.44 Post -new Prepared by Timmons G NOAA 24-hr D 1-Year Rainfall=3.40" Stage -Area -Storage for Pond 7P: SWIM Elevation Surface Storage (feet) (sq-ft) (cubic -feet) 664.00 5,147 0 664.10 5,243 519 664.20 5,338 1,049 664.30 5,433 1,587 664.40 5,529 2,135 664.50 5,625 2,693 664.60 5,720 3,260 664.70 5,816 3,837 664.80 5,911 4,423 664.90 6,006 5,019 665.00 6,102 5,625 665.10 6,203 6,240 665.20 6,304 6,865 665.30 6,406 7,501 665.40 6,507 8,146 665.50 6,608 8,802 665.60 6,709 9,468 665.70 6,810 10,144 665.80 6,912 10,830 665.90 7,013 11,526 666.00 7,114 12,233 666.10 7,221 12,949 666.20 7,328 13,677 666.30 7,434 14,415 666.40 7,541 15,164 666.50 7,648 15,923 666.60 7,755 16,693 666.70 7,862 17,474 666.80 7,968 18,265 666.90 8,075 19,068 667.00 8,182 19,881 667.10 8,295 20,704 667.20 8,407 21,539 667.30 8,519 22,386 667.40 8,632 23,243 667.50 8,745 24,112 667.60 8,857 24,992 667.70 8,970 25,884 667.80 9,082 26,786 667.90 9,194 27,700 668.00 9,307 28,625 668.10 9,425 29,562 668.20 9,543 30,510 668.30 9,662 31,470 668.40 9,780 32,442 668.50 9,898 33,426 668.60 10,016 34,422 668.70 10,134 35,429 668.80 10,253 36,449 668.90 10,371 37,480 669.00 10,489 38,523 669.10 10,613 39,578 Elevation Surface Storage (feet) (sq-ft) (cubic -feet) 669.20 10,737 40,646 669.30 10,860 41,725 669.40 10,984 42,818 669.50 11,108 43,922 669.60 11,232 45,039 669.70 11,356 46,169 669.80 11,479 47,310 669.90 11,603 48,464 670.00 11,727 49,631 670.10 11,857 50,810 670.20 11,986 52,002 670.30 12,115 53,207 670.40 12,245 54,425 670.50 12,375 55,656 670.60 12,504 56,900 670.70 12,634 58,157 670.80 12,763 59,427 670.90 12,892 60,710 671.00 13,022 62,006 Printed 7/1/2021 Post -new Prepared by Timmons G NOAA 24-hr D 1-Year Rainfall=3.40" Printed 7/1/2021 Summary for Link 5L: Post -West Inflow Area = 1.080 ac, 20.37% Impervious, Inflow Depth > 1.74" for 1-Year event Inflow = 2.11 cfs @ 12.13 hrs, Volume= 0.157 of Primary = 2.11 cfs @ 12.13 hrs, Volume= 0.157 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 5L: Post -West Hydrograph ■ Inflow ■ Primary Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 1-Year Rainfall=3.40" Printed 7/1/2021 Summary for Link 6L: Post -Southeast Inflow Area = 15.520 ac, 19.01 % Impervious, Inflow Depth > 1.45" for 1-Year event Inflow = 21.95 cfs @ 12.17 hrs, Volume= 1.879 of Primary = 21.95 cfs @ 12.17 hrs, Volume= 1.879 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 6L: Post -Southeast Hydrograph ■ Inflow ■ Primary Time (horns) Post -new Prepared by Timmons G NOAA 24-hr D 1-Year Rainfall=3.40" Printed 7/1/2021 Summary for Link 10L: Total SE Inflow Area = 17.550 ac, 18.46% Impervious, Inflow Depth > 1.38" for 1-Year event Inflow = 11.60 cfs @ 12.32 hrs, Volume= 2.019 of Primary = 11.60 cfs @ 12.32 hrs, Volume= 2.019 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 10L: Total SE Hydrograph ■ Inflow ■ Primary Time (hours) Post -new NOAA 24-hr D 2-Year Rainfall=4.10" Prepared by Timmons Group Printed 7/1/2021 HVdroCAD® 10.00-25 s/n 08663 © 2019 HVdroCAD Software Solutions LLC Paoe 16 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 Subcatchment 1S: Post -West (road) Runoff Area=0.260 ac 84.62% Impervious Runoff Depth>3.21" Tc=6.0 min CN=92 Runoff=0.90 cfs 0.070 of Subcatchment 2S: Post -West (parcels) Runoff Area=0.820 ac 0.00% Impervious Runoff Depth>2.04" Tc=6.0 min CN=79 Runoff=1.91 cfs 0.140 of Subcatchment 3S: Post -Southeast (road) Runoff Area=5.940 ac 49.66% Impervious Runoff Depth>2.63" Tc=9.1 min CN=86 Runoff=15.85 cfs 1.303 of Subcatchment 4S: Post -Southeast (parcels) Runoff Area=9.580 ac 0.00% Impervious Runoff Depth>1.60" Flow Length=875' Tc=10.5 min CN=73 Runoff=14.72 cfs 1.273 of Subcatchment 7S: Post -Southeast (road, Runoff Area=1.820 ac 15.93% Impervious Runoff Depth>1.53" Tc=6.0 min CN=72 Runoff=3.14 cfs 0.232 of Subcatchment 9S: Post -Southeast (parcels, Runoff Area=0.210 ac 0.00% Impervious Runoff Depth>0.86" Flow Length=1,420' Tc=11.6 min CN=61 Runoff=0.15 cfs 0.015 of Pond 7P: SWM Peak Elev=667.19' Storage=21,495 cf Inflow=30.29 cfs 2.576 of Outflow=13.15 cfs 2.544 of Link 5L: Post -West Inflow=2.81 cfs 0.209 of Primary=2.81 cfs 0.209 of Link 6L: Post -Southeast Inflow=30.29 cfs 2.576 of Primary=30.29 cfs 2.576 of Link 10L: Total SE Inflow=14.32 cfs 2.791 of Primary=14.32 cfs 2.791 of Post -new Prepared by Timmons G NOAA 24-hr D 2-Year Rainfall=4.10" Printed 7/1/2021 Summary for Subcatchment 1 S: Post -West (road) Runoff = 0.90 cfs @ 12.13 hrs, Volume= 0.070 af, Depth> 3.21" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=4.10" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.040 61 >75% Grass cover, Good, HSG B 0.260 92 Weighted Average 0.040 15.38% Pervious Area 0.220 84.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Post -West (road) Hydrograph ■ Rurwff 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 2-Year Rainfall=4.10" Printed 7/1/2021 Summary for Subcatchment 2S: Post -West (parcels) Runoff = 1.91 cfs @ 12.13 hrs, Volume= 0.140 af, Depth> 2.04" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=4.10" Area (ac) CN 0.760 80 0.060 61 0.820 79 Weighted Average 0.820 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Post -West (parcels) Hydrograph ■ Rurwff 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 2-Year Rainfall=4.10" Printed 7/1/2021 Summary for Subcatchment 3S: Post -Southeast (road) Runoff = 15.85 cfs @ 12.16 hrs, Volume= 1.303 af, Depth> 2.63" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=4.10" Area (ac) CN Description 1.160 98 Paved parking, HSG B ' 1.790 98 Paved parking, HSG D 0.820 61 >75% Grass cover, Good, HSG B 2.170 80 >75% Grass cover, Good, HSG D 5.940 86 Weighted Average 2.990 50.34% Pervious Area 2.950 49.66% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.1 Direct Entry, From Pipe Calcs 17 16 15 14 13 12 11 w 10 3 9 8 LL 7 6 5 4 3 2 1 0 0 Subcatchment 3S: Post -Southeast (road) Hydrograph ■ ® ■.. :...■■■■.�� ..■■■■■�' ■■NNEN .......■■■ ........ . .......... ■■■■■■■■■■ (�� ■■■■■■■■■� ■■■■■■■■■■ MAP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Rurwff Post -new Prepared by Timmons G NOAA 24-hr D 2-Year Rainfall=4.10" Printed 7/1/2021 Summary for Subcatchment 4S: Post -Southeast (parcels) Runoff = 14.72 cfs @ 12.19 hrs, Volume= 1.273 af, Depth> 1.60" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=4.10" Area (ac) CN Description 3.450 61 >75% Grass cover, Good, HSG B 6.130 80 >75% Grass cover, Good, HSG D 9.580 73 Weighted Average 9.580 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.4 100 0.0300 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 0.9 154 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 2.2 621 0.0330 4.69 15.01 Channel Flow, Area= 3.2 sf Perim= 8.5' r= 0.38' n= 0.030 10.5 875 Total Subcatchment 4S: Post -Southeast (parcels) Hydrograph i 1 0 1 2 3 4 5 7 8 9 1020 Time (houm) IN ■ Rurwff Post -new Prepared by Timmons G NOAA 24-hr D 2-Year Rainfall=4.10" Printed 7/1/2021 Summary for Subcatchment 7S: Post -Southeast (road, undetained) Runoff = 3.14 cfs @ 12.14 hrs, Volume= 0.232 af, Depth> 1.53" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=4.10" Area (ac) CN 0.220 98 Paved parking, HSG B 0.070 98 Paved parking, HSG D 1.020 61 >75% Grass cover, Good, HSG B 0.510 80 >75% Grass cover, Good, HSG D 1.820 72 Weighted Average 1.530 84.07% Pervious Area 0.290 15.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 7S: Post -Southeast (road, undetained) Hydrograph ■ Rurwff Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 2-Year Rainfall=4.10" Printed 7/1/2021 Summary for Subcatchment 9S: Post -Southeast (parcels, undetained) Runoff = 0.15 cfs @ 12.21 hrs, Volume= 0.015 af, Depth> 0.86" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 2-Year Rainfall=4.10" Area (ac) CN 0.210 61 >75% Grass cover, Good, HSG B 0.210 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.1 100 0.0746 0.33 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 3.3 667 0.0430 3.34 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.2 653 0.0200 3.41 27.59 Channel Flow, Area= 8.1 sf Perim= 11.1' r= 0.73' n= 0.050 11.6 1,420 Total Subcatchment 9S: Post -Southeast (parcels, undetained) Hydrograph ■ Rurwff Time (home) Post -new Prepared by Timmons G NOAA 24-hr D 2-Year Rainfall=4.10" Summary for Pond 7P: SWM Printed 7/1/2021 Inflow Area = 15.520 ac, 19.01 % Impervious, Inflow Depth > 1.99" for 2-Year event Inflow = 30.29 cfs @ 12.17 hrs, Volume= 2.576 of Outflow = 13.15 cfs @ 12.38 hrs, Volume= 2.544 af, Atten= 57%, Lag= 12.5 min Primary = 13.15 cfs @ 12.38 hrs, Volume= 2.544 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 667.19' @ 12.38 hrs Surf.Area= 8,401 sf Storage= 21,495 cf Plug -Flow detention time= 25.5 min calculated for 2.539 of (99% of inflow) Center -of -Mass det. time= 18.2 min ( 861.4 - 843.2 ) Volume Invert Avail.Storage Storage Description #1 664.00' 62,006 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 664.00 5,147 0 0 665.00 6,102 5,625 5,625 666.00 7,114 6,608 12,233 667.00 8,182 7,648 19,881 668.00 9,307 8,745 28,625 669.00 10,489 9,898 38,523 670.00 11,727 11,108 49,631 671.00 13,022 12,375 62,006 Device Routing Invert Outlet Devices #1 Primary 664.00' 54.0" Round Culvert L= 115.9' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 664.00' / 663.27' S= 0.0063 '/' Cc= 0.900 n= 0.013, Flow Area= 15.90 sf #2 Device 1 664.00' 20.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 #3 Device 1 667.65' 17.3' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Z�Primary OutFlow Max=13.14 cfs @ 12.38 hrs HW=667.19' (Free Discharge) _Cu (Passes 13.14 cfs of 66.01 cfs potential flow) �2=Orifice/Grate (Orifice Controls 13.14 cfs @ 7.88 fps) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Post -new Prepared by Timmons Pond 7P: SWM Hydrograph Time (houm) NOAA 24-hr D 2-Year Rainfall=4.10" Printed 7/l/2021 ■ Inflow ■ Primary Post -new Prepared by Timmons Elevation Primary (feet) (cfs) 664.00 0.00 664.04 0.01 664.08 0.04 664.12 0.10 664.16 0.19 664.20 0.31 664.24 0.46 664.28 0.63 664.32 0.83 664.36 1.07 664.40 1.33 664.44 1.56 664.48 1.78 664.52 2.01 664.56 2.24 664.60 2.49 664.64 2.74 664.68 3.00 664.72 3.27 664.76 3.54 664.80 3.83 664.84 4.12 664.88 4.42 664.92 4.72 664.96 5.03 665.00 5.35 665.04 5.63 665.08 5.88 665.12 6.12 665.16 6.34 665.20 6.55 665.24 6.76 665.28 6.95 665.32 7.15 665.36 7.33 665.40 7.51 665.44 7.68 665.48 7.85 665.52 8.02 665.56 8.18 665.60 8.34 665.64 8.50 665.68 8.65 665.72 8.80 665.76 8.95 665.80 9.09 665.84 9.23 665.88 9.37 665.92 9.51 665.96 9.65 666.00 9.78 666.04 9.91 NOAA 24-hr D 2-Year Rainfall=4.10" Stage -Discharge for Pond 7P: SWM Elevation Primary (feet) (cfs) 666.08 10.04 666.12 10.17 666.16 10.30 666.20 10.42 666.24 10.55 666.28 10.67 666.32 10.79 666.36 10.91 666.40 11.03 666.44 11.15 666.48 11.26 666.52 11.38 666.56 11.49 666.60 11.60 666.64 11.71 666.68 11.82 666.72 11.93 666.76 12.04 666.80 12.15 666.84 12.25 666.88 12.36 666.92 12.46 666.96 12.56 667.00 12.67 667.04 12.77 667.08 12.87 667.12 12.97 667.16 13.07 667.20 13.17 667.24 13.27 667.28 13.36 667.32 13.46 667.36 13.55 667.40 13.65 667.44 13.74 667.48 13.84 667.52 13.93 667.56 14.02 667.60 14.11 667.64 14.21 667.68 14.59 667.72 15.43 667.76 16.54 667.80 17.84 667.84 19.33 667.88 20.96 667.92 22.74 667.96 24.64 668.00 26.67 668.04 28.80 668.08 31.04 668.12 33.39 Elevation Primary (feet) (cfs) 668.16 35.82 668.20 38.35 668.24 40.97 668.28 43.67 668.32 46.46 668.36 49.32 668.40 52.26 668.44 55.28 668.48 58.37 668.52 61.52 668.56 64.75 668.60 68.05 668.64 71.41 668.68 74.83 668.72 78.31 668.76 81.86 668.80 85.47 668.84 89.14 668.88 92.86 668.92 96.64 668.96 100.47 669.00 104.36 669.04 108.31 669.08 112.30 669.12 116.35 669.16 120.45 669.20 124.60 669.24 128.80 669.28 133.05 669.32 136.43 669.36 137.47 669.40 138.48 669.44 139.46 669.48 140.42 669.52 141.33 669.56 142.21 669.60 143.06 669.64 143.85 669.68 144.60 669.72 145.30 669.76 145.93 669.80 146.50 669.84 146.98 669.88 147.36 669.92 147.59 669.96 147.60 670.00 146.61 670.04 147.92 670.08 149.22 670.12 150.50 670.16 151.78 670.20 153.04 Printed 7/1/2021 Elevation Primary (feet) (cfs) 670.24 154.30 670.28 155.54 670.32 156.78 670.36 158.00 670.40 159.22 670.44 160.42 670.48 161.62 670.52 162.81 670.56 163.99 670.60 165.16 670.64 166.32 670.68 167.48 670.72 168.62 670.76 169.76 670.80 170.89 670.84 172.02 670.88 173.14 670.92 174.25 670.96 175.35 671.00 176.44 Post -new Prepared by Timmons G NOAA 24-hr D 2-Year Rainfall=4.10" Stage -Area -Storage for Pond 7P: SWIM Elevation Surface Storage (feet) (sq-ft) (cubic -feet) 664.00 5,147 0 664.10 5,243 519 664.20 5,338 1,049 664.30 5,433 1,587 664.40 5,529 2,135 664.50 5,625 2,693 664.60 5,720 3,260 664.70 5,816 3,837 664.80 5,911 4,423 664.90 6,006 5,019 665.00 6,102 5,625 665.10 6,203 6,240 665.20 6,304 6,865 665.30 6,406 7,501 665.40 6,507 8,146 665.50 6,608 8,802 665.60 6,709 9,468 665.70 6,810 10,144 665.80 6,912 10,830 665.90 7,013 11,526 666.00 7,114 12,233 666.10 7,221 12,949 666.20 7,328 13,677 666.30 7,434 14,415 666.40 7,541 15,164 666.50 7,648 15,923 666.60 7,755 16,693 666.70 7,862 17,474 666.80 7,968 18,265 666.90 8,075 19,068 667.00 8,182 19,881 667.10 8,295 20,704 667.20 8,407 21,539 667.30 8,519 22,386 667.40 8,632 23,243 667.50 8,745 24,112 667.60 8,857 24,992 667.70 8,970 25,884 667.80 9,082 26,786 667.90 9,194 27,700 668.00 9,307 28,625 668.10 9,425 29,562 668.20 9,543 30,510 668.30 9,662 31,470 668.40 9,780 32,442 668.50 9,898 33,426 668.60 10,016 34,422 668.70 10,134 35,429 668.80 10,253 36,449 668.90 10,371 37,480 669.00 10,489 38,523 669.10 10,613 39,578 Elevation Surface Storage (feet) (sq-ft) (cubic -feet) 669.20 10,737 40,646 669.30 10,860 41,725 669.40 10,984 42,818 669.50 11,108 43,922 669.60 11,232 45,039 669.70 11,356 46,169 669.80 11,479 47,310 669.90 11,603 48,464 670.00 11,727 49,631 670.10 11,857 50,810 670.20 11,986 52,002 670.30 12,115 53,207 670.40 12,245 54,425 670.50 12,375 55,656 670.60 12,504 56,900 670.70 12,634 58,157 670.80 12,763 59,427 670.90 12,892 60,710 671.00 13,022 62,006 Printed 7/1/2021 Post -new Prepared by Timmons G NOAA 24-hr D 2-Year Rainfall=4.10" Printed 7/1/2021 Summary for Link 5L: Post -West Inflow Area = 1.080 ac, 20.37% Impervious, Inflow Depth > 2.32" for 2-Year event Inflow = 2.81 cfs @ 12.13 hrs, Volume= 0.209 of Primary = 2.81 cfs @ 12.13 hrs, Volume= 0.209 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 5L: Post -West Hydrograph ■ Inflow ■ Primary Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 2-Year Rainfall=4.10" Printed 7/1/2021 Summary for Link 6L: Post -Southeast Inflow Area = 15.520 ac, 19.01 % Impervious, Inflow Depth > 1.99" for 2-Year event Inflow = 30.29 cfs @ 12.17 hrs, Volume= 2.576 of Primary = 30.29 cfs @ 12.17 hrs, Volume= 2.576 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 6L: Post -Southeast Hydrograph ■ h fim— ■ Primary Time (horns) Post -new Prepared by Timmons G NOAA 24-hr D 2-Year Rainfall=4.10" Printed 7/1/2021 Summary for Link 10L: Total SE Inflow Area = 17.550 ac, 18.46% Impervious, Inflow Depth > 1.91" for 2-Year event Inflow = 14.32 cfs @ 12.32 hrs, Volume= 2.791 of Primary = 14.32 cfs @ 12.32 hrs, Volume= 2.791 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 10L: Total SE Hydrograph ■ Inflow ■ Primary Time (horns) Post -new NOAA 24-hr D 10-Year Rainfall=6.20" Prepared by Timmons Group Printed 7/1/2021 HVdroCAD® 10.00-25 s/n 08663 © 2019 HVdroCAD Software Solutions LLC Paoe 30 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 Subcatchment 1S: Post -West (road) Runoff Area=0.260 ac 84.62% Impervious Runoff Depth>5.26" Tc=6.0 min CN=92 Runoff=1.42 cfs 0.114 of Subcatchment 2S: Post -West (parcels) Runoff Area=0.820 ac 0.00% Impervious Runoff Depth>3.85" Tc=6.0 min CN=79 Runoff=3.56 cfs 0.263 of Subcatchment 3S: Post -Southeast (road) Runoff Area=5.940 ac 49.66% Impervious Runoff Depth>4.59" Tc=9.1 min CN=86 Runoff=26.98 cfs 2.273 of Subcatchment 4S: Post -Southeast (parcels) Runoff Area=9.580 ac 0.00% Impervious Runoff Depth>3.25" Flow Length=875' Tc=10.5 min CN=73 Runoff=30.36 cfs 2.593 of Subcatchment 7S: Post -Southeast (road, Runoff Area=1.820 ac 15.93% Impervious Runoff Depth>3.15" Tc=6.0 min CN=72 Runoff=6.55 cfs 0.478 of Subcatchment 9S: Post -Southeast (parcels, Runoff Area=0.210 ac 0.00% Impervious Runoff Depth>2.13" Flow Length=1,420' Tc=11.6 min CN=61 Runoff=0.41 cfs 0.037 of Pond 7P: SWM Peak Elev=668.36' Storage=32,026 cf Inflow=56.95 cfs 4.866 of Outflow=49.12 cfs 4.824 of Link 5L: Post -West Inflow=4.98 cfs 0.377 of Primary=4.98 cfs 0.377 of Link 6L: Post -Southeast Inflow=56.95 cfs 4.866 of Primary=56.95 cfs 4.866 of Link 10L: Total SE Inflow=53.04 cfs 5.339 of Primary=53.04 cfs 5.339 of Post -new Prepared by Timmons G NOAA 24-hr D 10-Year Rainfall=6.20" Printed 7/1/2021 Summary for Subcatchment 1 S: Post -West (road) Runoff = 1.42 cfs @ 12.13 hrs, Volume= 0.114 af, Depth> 5.26" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=6.20" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.040 61 >75% Grass cover, Good, HSG B 0.260 92 Weighted Average 0.040 15.38% Pervious Area 0.220 84.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Post -West (road) Hydrograph I 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Rurwff 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Rurwff Post -new Prepared by Timmons G NOAA 24-hr D 10-Year Rainfall=6.20" Printed 7/1/2021 Summary for Subcatchment 2S: Post -West (parcels) Runoff = 3.56 cfs @ 12.13 hrs, Volume= 0.263 af, Depth> 3.85" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=6.20" Area (ac) CN Description 0.760 80 0.060 61 0.820 79 Weighted Average 0.820 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Post -West (parcels) Hydrograph ■ Runofi 9 1 2 3 4 5 6 7 8 9 19 11 12 13 14 15 16 17 18 19 29 21 22 23 24 Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 10-Year Rainfall=6.20" Printed 7/1/2021 Summary for Subcatchment 3S: Post -Southeast (road) Runoff = 26.98 cfs @ 12.16 hrs, Volume= 2.273 af, Depth> 4.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=6.20" Area (ac) CN Description 1.160 98 Paved parking, HSG B ' 1.790 98 Paved parking, HSG D 0.820 61 >75% Grass cover, Good, HSG B 2.170 80 >75% Grass cover, Good, HSG D 5.940 86 Weighted Average 2.990 50.34% Pervious Area 2.950 49.66% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.1 Direct Entry, From Pipe Calcs 4 2 0 0 Subcatchment 3S: Post -Southeast (road) Hydrograph i :■■■: I� ::::■■■::: ■■■■■■EM ■■■■■■■■■■ ■■■■■■■ O� ■■■W■■■''I 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Rurwff Post -new Prepared by Timmons G NOAA 24-hr D 10-Year Rainfall=6.20" Printed 7/1/2021 Summary for Subcatchment 4S: Post -Southeast (parcels) Runoff = 30.36 cfs @ 12.18 hrs, Volume= 2.593 af, Depth> 3.25" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=6.20" Area (ac) CN Description 3.450 61 >75% Grass cover, Good, HSG B 6.130 80 >75% Grass cover, Good, HSG D 9.580 73 Weighted Average 9.580 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.4 100 0.0300 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 0.9 154 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 2.2 621 0.0330 4.69 15.01 Channel Flow, Area= 3.2 sf Perim= 8.5' r= 0.38' n= 0.030 10.5 875 Total 34 32 30 28 26 24 22 20 18 p 16 LL 14 12 10 8 6 4 2 0 Subcatchment 4S: Post -Southeast (parcels) Hydrograph MEN ■■■■ ■■■ / ■■ MEMEMEME ■■■E■■■ ■■■■■■ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Runoff Post -new Prepared by Timmons G NOAA 24-hr D 10-Year Rainfall=6.20" Printed 7/1/2021 Summary for Subcatchment 7S: Post -Southeast (road, undetained) Runoff = 6.55 cfs @ 12.13 hrs, Volume= 0.478 af, Depth> 3.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 10-Year Rainfall=6.20" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.070 98 Paved parking, HSG D 1.020 61 >75% Grass cover, Good, HSG B 0.510 80 >75% Grass cover, Good, HSG D 1.820 72 Weighted Average 1.530 84.07% Pervious Area 0.290 15.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 7S: Post -Southeast (road, undetained) Hydrograph 7 6 5 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Rurwff Post -new Prepared by Timmons G NOAA 24-hr D 10-Year Rainfall=6.20" Printed 7/1/2021 Summary for Subcatchment 9S: Post -Southeast (parcels, undetained) Runoff = 0.41 cfs @ 12.20 hrs, Volume= 0.037 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 NOAA 24-hr D 10-Year Rainfall=6.20" Area (ac) CN 0.210 61 >75% Grass cover, Good, HSG B 0.210 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.1 100 0.0746 0.33 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 3.3 667 0.0430 3.34 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.2 653 0.0200 3.41 27.59 Channel Flow, Area= 8.1 sf Perim= 11.1' r= 0.73' n= 0.050 11.6 1,420 Total Subcatchment 9S: Post -Southeast (parcels, undetained) Hydrograph ■ Runoff 04 NOAA 24-hr'D', 0.3 sa6 10-Year Rainfall=6.20" 0 .3 sa2 - --.Runoff Area=0.210 ac °.3 0.28 Runoff Volume=0.037 of 0.24 Runoff Depth>2.13" M °oz Flow Length=1,420' 018 n ,a Tc=11.6. min I Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 10-Year Rainfall=6.20" Summary for Pond 7P: SWM Printed 7/1/2021 Inflow Area = 15.520 ac, 19.01 % Impervious, Inflow Depth > 3.76" for 10-Year event Inflow = 56.95 cfs @ 12.17 hrs, Volume= 4.866 of Outflow = 49.12 cfs @ 12.24 hrs, Volume= 4.824 af, Atten= 14%, Lag= 4.0 min Primary = 49.12 cfs @ 12.24 hrs, Volume= 4.824 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 668.36' @ 12.24 hrs Surf.Area= 9,729 sf Storage= 32,026 cf Plug -Flow detention time= 22.0 min calculated for 4.814 of (99% of inflow) Center -of -Mass det. time= 16.9 min ( 841.5 - 824.6 ) Volume Invert Avail.Storage Storage Description #1 664.00' 62,006 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 664.00 5,147 0 0 665.00 6,102 5,625 5,625 666.00 7,114 6,608 12,233 667.00 8,182 7,648 19,881 668.00 9,307 8,745 28,625 669.00 10,489 9,898 38,523 670.00 11,727 11,108 49,631 671.00 13,022 12,375 62,006 Device Routing Invert Outlet Devices #1 Primary 664.00' 54.0" Round Culvert L= 115.9' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 664.00' / 663.27' S= 0.0063 '/' Cc= 0.900 n= 0.013, Flow Area= 15.90 sf #2 Device 1 664.00' 20.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 #3 Device 1 667.65' 17.3' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Z�Primary OutFlow Max=48.10 cfs @ 12.24 hrs HW=668.34' (Free Discharge) _Cu (Passes 48.10 cfs of 105.87 cfs potential flow) �2=Orifice/Grate (Orifice Controls 15.72 cfs @ 9.43 fps) 3=Sharp-Crested Rectangular Weir (Weir Controls 32.38 cfs @ 2.72 fps) Post -new Prepared by Timmons Pond 7P: SWM Hydrograph Time (houm) NOAA 24-hr D 10-Year Rainfall=6.20" Printed 7/l/2021 ■ Inflow ■ Primary Post -new Prepared by Timmons G Elevation Primary (feet) (cfs) 664.00 0.00 664.04 0.01 664.08 0.04 664.12 0.10 664.16 0.19 664.20 0.31 664.24 0.46 664.28 0.63 664.32 0.83 664.36 1.07 664.40 1.33 664.44 1.56 664.48 1.78 664.52 2.01 664.56 2.24 664.60 2.49 664.64 2.74 664.68 3.00 664.72 3.27 664.76 3.54 664.80 3.83 664.84 4.12 664.88 4.42 664.92 4.72 664.96 5.03 665.00 5.35 665.04 5.63 665.08 5.88 665.12 6.12 665.16 6.34 665.20 6.55 665.24 6.76 665.28 6.95 665.32 7.15 665.36 7.33 665.40 7.51 665.44 7.68 665.48 7.85 665.52 8.02 665.56 8.18 665.60 8.34 665.64 8.50 665.68 8.65 665.72 8.80 665.76 8.95 665.80 9.09 665.84 9.23 665.88 9.37 665.92 9.51 665.96 9.65 666.00 9.78 666.04 9.91 NOAA 24-hr D 10-Year Rainfall=6.20" Stage -Discharge for Pond 7P: SWIM Elevation Primary (feet) (cfs) 666.08 10.04 666.12 10.17 666.16 10.30 666.20 10.42 666.24 10.55 666.28 10.67 666.32 10.79 666.36 10.91 666.40 11.03 666.44 11.15 666.48 11.26 666.52 11.38 666.56 11.49 666.60 11.60 666.64 11.71 666.68 11.82 666.72 11.93 666.76 12.04 666.80 12.15 666.84 12.25 666.88 12.36 666.92 12.46 666.96 12.56 667.00 12.67 667.04 12.77 667.08 12.87 667.12 12.97 667.16 13.07 667.20 13.17 667.24 13.27 667.28 13.36 667.32 13.46 667.36 13.55 667.40 13.65 667.44 13.74 667.48 13.84 667.52 13.93 667.56 14.02 667.60 14.11 667.64 14.21 667.68 14.59 667.72 15.43 667.76 16.54 667.80 17.84 667.84 19.33 667.88 20.96 667.92 22.74 667.96 24.64 668.00 26.67 668.04 28.80 668.08 31.04 668.12 33.39 Elevation Primary (feet) (cfs) 668.16 35.82 668.20 38.35 668.24 40.97 668.28 43.67 668.32 46.46 668.36 49.32 668.40 52.26 668.44 55.28 668.48 58.37 668.52 61.52 668.56 64.75 668.60 68.05 668.64 71.41 668.68 74.83 668.72 78.31 668.76 81.86 668.80 85.47 668.84 89.14 668.88 92.86 668.92 96.64 668.96 100.47 669.00 104.36 669.04 108.31 669.08 112.30 669.12 116.35 669.16 120.45 669.20 124.60 669.24 128.80 669.28 133.05 669.32 136.43 669.36 137.47 669.40 138.48 669.44 139.46 669.48 140.42 669.52 141.33 669.56 142.21 669.60 143.06 669.64 143.85 669.68 144.60 669.72 145.30 669.76 145.93 669.80 146.50 669.84 146.98 669.88 147.36 669.92 147.59 669.96 147.60 670.00 146.61 670.04 147.92 670.08 149.22 670.12 150.50 670.16 151.78 670.20 153.04 Printed 7/1/2021 Elevation Primary (feet) (cfs) 670.24 154.30 670.28 155.54 670.32 156.78 670.36 158.00 670.40 159.22 670.44 160.42 670.48 161.62 670.52 162.81 670.56 163.99 670.60 165.16 670.64 166.32 670.68 167.48 670.72 168.62 670.76 169.76 670.80 170.89 670.84 172.02 670.88 173.14 670.92 174.25 670.96 175.35 671.00 176.44 Post -new Prepared by Timmons G NOAA 24-hr D 10-Year Rainfall=6.20" Stage -Area -Storage for Pond 7P: SWIM Elevation Surface Storage (feet) (sq-ft) (cubic -feet) 664.00 5,147 0 664.10 5,243 519 664.20 5,338 1,049 664.30 5,433 1,587 664.40 5,529 2,135 664.50 5,625 2,693 664.60 5,720 3,260 664.70 5,816 3,837 664.80 5,911 4,423 664.90 6,006 5,019 665.00 6,102 5,625 665.10 6,203 6,240 665.20 6,304 6,865 665.30 6,406 7,501 665.40 6,507 8,146 665.50 6,608 8,802 665.60 6,709 9,468 665.70 6,810 10,144 665.80 6,912 10,830 665.90 7,013 11,526 666.00 7,114 12,233 666.10 7,221 12,949 666.20 7,328 13,677 666.30 7,434 14,415 666.40 7,541 15,164 666.50 7,648 15,923 666.60 7,755 16,693 666.70 7,862 17,474 666.80 7,968 18,265 666.90 8,075 19,068 667.00 8,182 19,881 667.10 8,295 20,704 667.20 8,407 21,539 667.30 8,519 22,386 667.40 8,632 23,243 667.50 8,745 24,112 667.60 8,857 24,992 667.70 8,970 25,884 667.80 9,082 26,786 667.90 9,194 27,700 668.00 9,307 28,625 668.10 9,425 29,562 668.20 9,543 30,510 668.30 9,662 31,470 668.40 9,780 32,442 668.50 9,898 33,426 668.60 10,016 34,422 668.70 10,134 35,429 668.80 10,253 36,449 668.90 10,371 37,480 669.00 10,489 38,523 669.10 10,613 39,578 Elevation Surface Storage (feet) (sq-ft) (cubic -feet) 669.20 10,737 40,646 669.30 10,860 41,725 669.40 10,984 42,818 669.50 11,108 43,922 669.60 11,232 45,039 669.70 11,356 46,169 669.80 11,479 47,310 669.90 11,603 48,464 670.00 11,727 49,631 670.10 11,857 50,810 670.20 11,986 52,002 670.30 12,115 53,207 670.40 12,245 54,425 670.50 12,375 55,656 670.60 12,504 56,900 670.70 12,634 58,157 670.80 12,763 59,427 670.90 12,892 60,710 671.00 13,022 62,006 Printed 7/1/2021 Post -new Prepared by Timmons G NOAA 24-hr D 10-Year Rainfall=6.20" Printed 7/1/2021 Summary for Link 5L: Post -West Inflow Area = 1.080 ac, 20.37% Impervious, Inflow Depth > 4.19" for 10-Year event Inflow = 4.98 cfs @ 12.13 hrs, Volume= 0.377 of Primary = 4.98 cfs @ 12.13 hrs, Volume= 0.377 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 5L: Post -West Hydrograph ■ Infim— ■ Primary Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 10-Year Rainfall=6.20" Printed 7/1/2021 Summary for Link 6L: Post -Southeast Inflow Area = 15.520 ac, 19.01 % Impervious, Inflow Depth > 3.76" for 10-Year event Inflow = 56.95 cfs @ 12.17 hrs, Volume= 4.866 of Primary = 56.95 cfs @ 12.17 hrs, Volume= 4.866 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 6L: Post -Southeast Hydrograph ■ Inflow ■ Primary Time (houm) Post -new Prepared by Timmons G NOAA 24-hr D 10-Year Rainfall=6.20" Printed 7/1/2021 Summary for Link 10L: Total SE Inflow Area = 17.550 ac, 18.46% Impervious, Inflow Depth > 3.65" for 10-Year event Inflow = 53.04 cfs @ 12.23 hrs, Volume= 5.339 of Primary = 53.04 cfs @ 12.23 hrs, Volume= 5.339 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 10L: Total SE Hydrograph ■ Inflow ■ Primary Time (hours) Post -new NOAA 24-hrD 100-Year Rainfall=10.10" Prepared by Timmons Group Printed 7/1/2021 HVdroCAD® 10.00-25 s/n 08663 © 2019 HVdroCAD Software Solutions LLC Paoe 44 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 Subcatchment 1S: Post -West (road) Runoff Area=0.260 ac 84.62% Impervious Runoff Depth>9.12" Tc=6.0 min CN=92 Runoff=2.39 cfs 0.198 of Subcatchment 2S: Post -West (parcels) Runoff Area=0.820 ac 0.00% Impervious Runoff Depth>7.48" Tc=6.0 min CN=79 Runoff=6.69 cfs 0.511 of Subcatchment 3S: Post -Southeast (road) Runoff Area=5.940 ac 49.66% Impervious Runoff Depth>8.37" Tc=9.1 min CN=86 Runoff=47.48 cfs 4.141 of Subcatchment 4S: Post -Southeast (parcels) Runoff Area=9.580 ac 0.00% Impervious Runoff Depth>6.70" Flow Length=875' Tc=10.5 min CN=73 Runoff=61.61 cfs 5.345 of Subcatchment 7S: Post -Southeast (road, Runoff Area=1.820 ac 15.93% Impervious Runoff Depth>6.57" Tc=6.0 min CN=72 Runoff=13.38 cfs 0.997 of Subcatchment 9S: Post -Southeast (parcels, Runoff Area=0.210 ac 0.00% Impervious Runoff Depth>5.10" Flow Length=1,420' Tc=11.6 min CN=61 Runoff=1.01 cfs 0.089 of Pond 7P: SWM Peak Elev=669.00' Storage=38,532 cf Inflow=108.52 cfs 9.486 of Outflow=104.45 cfs 9.429 of Link 5L: Post -West Inflow=9.08 cfs 0.709 of Primary=9.08 cfs 0.709 of Link 6L: Post -Southeast Inflow=108.52 cfs 9.486 of Primary=108.52 cfs 9.486 of Link 10L: Total SE Inflow=114.67 cfs 10.515 of Primary=114.67 cfs 10.515 of Post -new Prepared by Timmons G NOAA 24-hr D 100-Year Rainfall=10.10" Printed 7/1/2021 Summary for Subcatchment 1 S: Post -West (road) Runoff = 2.39 cfs @ 12.13 hrs, Volume= 0.198 af, Depth> 9.12" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=10.10" Area (ac) CN Description 0.220 98 Paved parking, HSG B 0.040 61 >75% Grass cover, Good, HSG B 0.260 92 Weighted Average 0.040 15.38% Pervious Area 0.220 84.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Post -West (road) Hydrograph ■ Rurwff 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 100-Year Rainfall=10.10" Printed 7/1/2021 Summary for Subcatchment 2S: Post -West (parcels) Runoff = 6.69 cfs @ 12.13 hrs, Volume= 0.511 af, Depth> 7.48" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=10.10" Area (ac) CN Description 0.760 80 0.060 61 0.820 79 Weighted Average 0.820 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Post -West (parcels) Hydrograph ■ Rurwff Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 100-Year Rainfall=10.10" Printed 7/1/2021 Summary for Subcatchment 3S: Post -Southeast (road) Runoff = 47.48 cfs @ 12.16 hrs, Volume= 4.141 af, Depth> 8.37" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=10.10" Area (ac) CN Description 1.160 98 Paved parking, HSG B ' 1.790 98 Paved parking, HSG D 0.820 61 >75% Grass cover, Good, HSG B 2.170 80 >75% Grass cover, Good, HSG D 5.940 86 Weighted Average 2.990 50.34% Pervious Area 2.950 49.66% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.1 Direct Entry, From Pipe Calcs 50 45 40 35 w 30 3p 25 LL 20 15 10 5 Subcatchment 3S: Post -Southeast (road) Hydrograph Monson■ �, NINE■■■■ 00 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 �1i7,18 i8..19 .20 .2�2Z.23. 24 Time (hours) ■ Rurwff Post -new Prepared by Timmons G NOAA 24-hr D 100-Year Rainfall=10.10" Printed 7/1/2021 Summary for Subcatchment 4S: Post -Southeast (parcels) Runoff = 61.61 cfs @ 12.18 hrs, Volume= 5.345 af, Depth> 6.70" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=10.10" Area (ac) CN Description 3.450 61 >75% Grass cover, Good, HSG B 6.130 80 >75% Grass cover, Good, HSG D 9.580 73 Weighted Average 9.580 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.4 100 0.0300 0.23 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 0.9 154 0.0330 2.92 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 2.2 621 0.0330 4.69 15.01 Channel Flow, Area= 3.2 sf Perim= 8.5' r= 0.38' n= 0.030 10.5 875 Total Subcatchment 4S: Post -Southeast (parcels) Hydrograph VA ■■■ f+�'ili�iii�ii�ililii3�Y Lii���G�i�73C�i 1� ■■■■■■■■■■ ■■■■■■■■■■ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) ■ Runoff Post -new Prepared by Timmons G NOAA 24-hr D 100-Year Rainfall=10.10" Printed 7/1/2021 Summary for Subcatchment 7S: Post -Southeast (road, undetained) Runoff = 13.38 cfs @ 12.13 hrs, Volume= 0.997 af, Depth> 6.57" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=10.10" Area (ac) CN 0.220 98 Paved parking, HSG B 0.070 98 Paved parking, HSG D 1.020 61 >75% Grass cover, Good, HSG B 0.510 80 >75% Grass cover, Good, HSG D 1.820 72 Weighted Average 1.530 84.07% Pervious Area 0.290 15.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 7S: Post -Southeast (road, undetained) Hydrograph ■ Rurwff Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 100-Year Rainfall=10.10" Printed 7/1/2021 Summary for Subcatchment 9S: Post -Southeast (parcels, undetained) Runoff = 1.01 cfs @ 12.20 hrs, Volume= 0.089 af, Depth> 5.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=10.10" Area (ac) CN 0.210 61 >75% Grass cover, Good, HSG B 0.210 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.1 100 0.0746 0.33 Sheet Flow, Grass: Short n= 0.150 P2= 4.10" 3.3 667 0.0430 3.34 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 3.2 653 0.0200 3.41 27.59 Channel Flow, Area= 8.1 sf Perim= 11.1' r= 0.73' n= 0.050 11.6 1,420 Total Subcatchment 9S: Post -Southeast (parcels, undetained) Hydrograph 0 Runoff Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 100-Year Rainfall=10.10" Summary for Pond 7P: SWM Printed 7/1/2021 Inflow Area = 15.520 ac, 19.01 % Impervious, Inflow Depth > 7.33" for 100-Year event Inflow = 108.52 cfs @ 12.17 hrs, Volume= 9.486 of Outflow = 104.45 cfs @ 12.20 hrs, Volume= 9.429 af, Atten= 4%, Lag= 1.9 min Primary = 104.45 cfs @ 12.20 hrs, Volume= 9.429 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 669.00' @ 12.20 hrs Surf.Area= 10,490 sf Storage= 38,532 cf Plug -Flow detention time= 18.0 min calculated for 9.410 of (99% of inflow) Center -of -Mass det. time= 14.2 min ( 819.3 - 805.1 ) Volume Invert Avail.Storage Storage Description #1 664.00' 62,006 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 664.00 5,147 0 0 665.00 6,102 5,625 5,625 666.00 7,114 6,608 12,233 667.00 8,182 7,648 19,881 668.00 9,307 8,745 28,625 669.00 10,489 9,898 38,523 670.00 11,727 11,108 49,631 671.00 13,022 12,375 62,006 Device Routing Invert Outlet Devices #1 Primary 664.00' 54.0" Round Culvert L= 115.9' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 664.00' / 663.27' S= 0.0063 '/' Cc= 0.900 n= 0.013, Flow Area= 15.90 sf #2 Device 1 664.00' 20.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 #3 Device 1 667.65' 17.3' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Z�Primary OutFlow Max=104.35 cfs @ 12.20 hrs HW=669.00' (Free Discharge) _Cu (Passes 104.35 cfs of 127.32 cfs potential flow) �2=Orifice/Grate (Orifice Controls 17.01 cfs @ 10.21 fps) 3=Sharp-Crested Rectangular Weir (Weir Controls 87.33 cfs @ 3.80 fps) Post -new Prepared by Timmons Pond 7P: SWM Hydrograph Time (hours) NOAA 24-hr D 100-Year Rainfall=10.10" Printed 7/l/2021 ■ Inflow ■ Primary Post -new Prepared by Timmons Elevation Primary (feet) (cfs) 664.00 0.00 664.04 0.01 664.08 0.04 664.12 0.10 664.16 0.19 664.20 0.31 664.24 0.46 664.28 0.63 664.32 0.83 664.36 1.07 664.40 1.33 664.44 1.56 664.48 1.78 664.52 2.01 664.56 2.24 664.60 2.49 664.64 2.74 664.68 3.00 664.72 3.27 664.76 3.54 664.80 3.83 664.84 4.12 664.88 4.42 664.92 4.72 664.96 5.03 665.00 5.35 665.04 5.63 665.08 5.88 665.12 6.12 665.16 6.34 665.20 6.55 665.24 6.76 665.28 6.95 665.32 7.15 665.36 7.33 665.40 7.51 665.44 7.68 665.48 7.85 665.52 8.02 665.56 8.18 665.60 8.34 665.64 8.50 665.68 8.65 665.72 8.80 665.76 8.95 665.80 9.09 665.84 9.23 665.88 9.37 665.92 9.51 665.96 9.65 666.00 9.78 666.04 9.91 NOAA 24-hr D 100-Year Rainfall=10.10" Stage -Discharge for Pond 7P: SWM Elevation Primary (feet) (cfs) 666.08 10.04 666.12 10.17 666.16 10.30 666.20 10.42 666.24 10.55 666.28 10.67 666.32 10.79 666.36 10.91 666.40 11.03 666.44 11.15 666.48 11.26 666.52 11.38 666.56 11.49 666.60 11.60 666.64 11.71 666.68 11.82 666.72 11.93 666.76 12.04 666.80 12.15 666.84 12.25 666.88 12.36 666.92 12.46 666.96 12.56 667.00 12.67 667.04 12.77 667.08 12.87 667.12 12.97 667.16 13.07 667.20 13.17 667.24 13.27 667.28 13.36 667.32 13.46 667.36 13.55 667.40 13.65 667.44 13.74 667.48 13.84 667.52 13.93 667.56 14.02 667.60 14.11 667.64 14.21 667.68 14.59 667.72 15.43 667.76 16.54 667.80 17.84 667.84 19.33 667.88 20.96 667.92 22.74 667.96 24.64 668.00 26.67 668.04 28.80 668.08 31.04 668.12 33.39 Elevation Primary (feet) (cfs) 668.16 35.82 668.20 38.35 668.24 40.97 668.28 43.67 668.32 46.46 668.36 49.32 668.40 52.26 668.44 55.28 668.48 58.37 668.52 61.52 668.56 64.75 668.60 68.05 668.64 71.41 668.68 74.83 668.72 78.31 668.76 81.86 668.80 85.47 668.84 89.14 668.88 92.86 668.92 96.64 668.96 100.47 669.00 104.36 669.04 108.31 669.08 112.30 669.12 116.35 669.16 120.45 669.20 124.60 669.24 128.80 669.28 133.05 669.32 136.43 669.36 137.47 669.40 138.48 669.44 139.46 669.48 140.42 669.52 141.33 669.56 142.21 669.60 143.06 669.64 143.85 669.68 144.60 669.72 145.30 669.76 145.93 669.80 146.50 669.84 146.98 669.88 147.36 669.92 147.59 669.96 147.60 670.00 146.61 670.04 147.92 670.08 149.22 670.12 150.50 670.16 151.78 670.20 153.04 Printed 7/1/2021 Elevation Primary (feet) (cfs) 670.24 154.30 670.28 155.54 670.32 156.78 670.36 158.00 670.40 159.22 670.44 160.42 670.48 161.62 670.52 162.81 670.56 163.99 670.60 165.16 670.64 166.32 670.68 167.48 670.72 168.62 670.76 169.76 670.80 170.89 670.84 172.02 670.88 173.14 670.92 174.25 670.96 175.35 671.00 176.44 Post -new Prepared by Timmons G NOAA 24-hr D 100-Year Rainfall=10.10" Stage -Area -Storage for Pond 7P: SWIM Elevation Surface Storage (feet) (sq-ft) (cubic -feet) 664.00 5,147 0 664.10 5,243 519 664.20 5,338 1,049 664.30 5,433 1,587 664.40 5,529 2,135 664.50 5,625 2,693 664.60 5,720 3,260 664.70 5,816 3,837 664.80 5,911 4,423 664.90 6,006 5,019 665.00 6,102 5,625 665.10 6,203 6,240 665.20 6,304 6,865 665.30 6,406 7,501 665.40 6,507 8,146 665.50 6,608 8,802 665.60 6,709 9,468 665.70 6,810 10,144 665.80 6,912 10,830 665.90 7,013 11,526 666.00 7,114 12,233 666.10 7,221 12,949 666.20 7,328 13,677 666.30 7,434 14,415 666.40 7,541 15,164 666.50 7,648 15,923 666.60 7,755 16,693 666.70 7,862 17,474 666.80 7,968 18,265 666.90 8,075 19,068 667.00 8,182 19,881 667.10 8,295 20,704 667.20 8,407 21,539 667.30 8,519 22,386 667.40 8,632 23,243 667.50 8,745 24,112 667.60 8,857 24,992 667.70 8,970 25,884 667.80 9,082 26,786 667.90 9,194 27,700 668.00 9,307 28,625 668.10 9,425 29,562 668.20 9,543 30,510 668.30 9,662 31,470 668.40 9,780 32,442 668.50 9,898 33,426 668.60 10,016 34,422 668.70 10,134 35,429 668.80 10,253 36,449 668.90 10,371 37,480 669.00 10,489 38,523 669.10 10,613 39,578 Elevation Surface Storage (feet) (sq-ft) (cubic -feet) 669.20 10,737 40,646 669.30 10,860 41,725 669.40 10,984 42,818 669.50 11,108 43,922 669.60 11,232 45,039 669.70 11,356 46,169 669.80 11,479 47,310 669.90 11,603 48,464 670.00 11,727 49,631 670.10 11,857 50,810 670.20 11,986 52,002 670.30 12,115 53,207 670.40 12,245 54,425 670.50 12,375 55,656 670.60 12,504 56,900 670.70 12,634 58,157 670.80 12,763 59,427 670.90 12,892 60,710 671.00 13,022 62,006 Printed 7/1/2021 Post -new Prepared by Timmons G NOAA 24-hr D 100-Year Rainfall=10.10" Printed 7/1/2021 Summary for Link 5L: Post -West Inflow Area = 1.080 ac, 20.37% Impervious, Inflow Depth > 7.88" for 100-Year event Inflow = 9.08 cfs @ 12.13 hrs, Volume= 0.709 of Primary = 9.08 cfs @ 12.13 hrs, Volume= 0.709 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 5L: Post -West Hydrograph ■ InMov ■ Primary Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 100-Year Rainfall=10.10" Printed 7/1/2021 Summary for Link 6L: Post -Southeast Inflow Area = 15.520 ac, 19.01 % Impervious, Inflow Depth > 7.33" for 100-Year event Inflow = 108.52 cfs @ 12.17 hrs, Volume= 9.486 of Primary = 108.52 cfs @ 12.17 hrs, Volume= 9.486 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 6L: Post -Southeast Hydrograph ■ h fim— ■ Primary Time (hours) Post -new Prepared by Timmons G NOAA 24-hr D 100-Year Rainfall=10.10" Printed 7/1/2021 Summary for Link 10L: Total SE Inflow Area = 17.550 ac, 18.46% Impervious, Inflow Depth > 7.19" for 100-Year event Inflow = 114.67 cfs @ 12.19 hrs, Volume= 10.515 of Primary = 114.67 cfs @ 12.19 hrs, Volume= 10.515 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 10L: Total SE Hydrograph ■ Infim— ■ Primary Time (hours) If ' �� 1. 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I I I r � I — Po IIIIIIII; � II 1 1 1 11 11 11 111 1 Virginia Runoff Reduction Method WOMsheel DEQ Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet - Version 3.0 BMP Design Specifications List: 2013 Draft Stds & Specs Site Summary Project Title: Barnes Lumber Date: 44375 Total Rainfall (in): 43 Total Disturbed Acreage: I8.fi4 Site Land Cover Summary Pre-ReDevelopment Land Cover (acres) A soils B Soils C Soils D Soils Totals %of Total Forest/Open (acres) 0.00 1.91 0.00 0.93 2.84 15 Managed Turf (acres) 1 0.00 4.32 0.00 3.95 8.27 44 Impervious Cover (acres) 1 0.00 0.97 0.00 6.56 7.53 40 18.64 100 Post-ReDevelopment Land Cover (acres) !Ells B Sol Is C Solis D Solis Totals %of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acre') 1 0.00 5.60 0.00 9.58 15.18 81 Impervious Cover (acres) 0.00 1.60 0.00 1.86 3.46 19 18.64 100 Site Tv and Land Cover Nutrient Loads Final Post -Development Post Post- Adjusted Pre- (Post-ReDevelopment Development &New Impervious) ReDevelopment (New Impervious) ReDevelopment Site Rv 0.36 0.36 - 0.49 Treatment Volume(fts) 24,686 24,686 -- 33,067 TP Load (lb/yr) 15.51 15.51 - 20.78 Total TP Load Reduction Required (lb/yr) -1.11 -1.11 0 Final Post -Development Load (Post-ReDevelopment & New Impervious) Pre- ReDevelopment TN Load (Ib/yr) 110.96 148.63 Pre ReDevelopment Final Post -Development Port-ReDevelopment TP TP Load per acre TP Load per acre Load per acre (lb/acre/yr) (lb/acre/yr) Ib acrer 1.11 0.83 0.83 Summary Print Virginia Runoff Reduction Method WOMsheel ----------------------------- _-_ ------ _-_ ------ _-_ _-_._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___- Site Compliance Summary Maximum %Reduction Required Below PrieReDevelopment Load 20% Total Runoff Volume Reduction (f[s) 0 Total TP Load Reduction Achieved (Ih/yr) 0.00 Total TN Load Reduction Achieved (Ih/yr) 0.00 Remaining Post Development TP Load 15.51 (Ih/yr) Remaining TP Load Reduction(16/yr) 000 Required ** TARGET TP REDUCTION EXCEEDED BY 1.11 LB/YEAR ** Summary Print Virginia Runoff Reduction Method WOMsheel Drainage Area Summary D.A. A D.A. B D.A. C D.A. D D.A. E Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.0o coo Managed Turf (acres) 0.00 0.00 0.00 0.00 0.0o coo Impervious Cover (acres) 0.00 0.00 0.00 0.00 0.0o coo Total Area (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Drainage Area Compliance Summary D.A. A D.A. B D.A. C D.A. D D.A. E Total TP Load Reduced (Ib/yr) 0.00 0.00 0.00 D.DD coo 0.00 TN Load Reduced (lb/yr) 0.00 0.00 0.00 D.DD coo 0.00 Summary Print Virginia Runoff Reduction Method! WoMsheel Runoff Volume and CN Calculations ITarget Rainfall EVeot(in) 1 0.00 1 0.00 1 0.00 1 Drainage Areas RV&CN Drainage Area Drainage Area Drainage Area Drainage Area Drainage Area ON 0 0 0 0 0 RR (ft°) 0 0 0 0 0 1-year return period RV wo RR(ws-in) 0.00 0.00 OAO 0.00 0.00 RVw RR (.sin) 0.00 0.00 OAO 0.00 0.00 CN adjusted 0 0 0 0 0 2-year return period RV wo RR(ws-in) 0.00 0.00 OAO 0.00 0.00 RV. RR (wsn) 0.00 0.00 OAO 0.00 0.00 CN adjusted 0 0 0 0 0 10-year return period o0.R (ws-in) 0.00 0.00 0.00 0.00 0.00 PRklw:R0.(wsin) 0.00 0.00 0.00 0.00 0.00 CN adjusted 0 0 0 0 0 Summary Print