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HomeMy WebLinkAboutWPO201800023 Calculations 2018-08-24Keswick Hall Central Energy Plant Demolition and Renovation SDP-2018-017 COUNTY OF ALBEMARLE, VIRGINIA MAJOR SITE PLAN AMENDMENT DESIGN CALCULATIONS & NARRATIVE MARCH 26, 2018 REVISED: JULY 189 2018 AUGUST 21, 2018 TIMMONS GROUP YOUR. VISION ACHIEVED THROUGH OURS. Prepared by: Craig Kotarski, PE Timmons Group 111 W. High Street Charlottesville, VA 22902 434.327.1688 CRAIGW J. KOrrARSICI y Lic. No. 0402048507 Table of Contents Section Title 1 Project Narrative 2 Pipe and Inlet Computations 3 Virginia Runoff Reduction Method Worksheet Summary 4 Pre -Developed HydroCAD Calculations 5 Post -Developed HydroCAD Calculations Project Narrative: This project includes the demolition of existing structures, construction of a central energy plant and associated utilities. Limits of clearing and grading area is 2.86 acres. Water Quality Compliance: The disturbed area of 2.28 acres was used for the water quality analysis. In the proposed condition there will be 1.95 acres of managed turf and 0.33 acres of impervious cover. Phosphorus removal will be achieved through the installation of a bioretention facility. All surplus credits we be used towards stormwater quality requirements, see plan titled "Keswick Hall Additions and Site Improvements". Water Quantity Compliance: Stormwater Quantity requirements for analysis point 1 will utilize a bioretention facility, adjacent to the central energy plant, in order to meet all stormwater quantity requirements for this drainage area. This bioretention facility lhas been sized to meet the demand of future site improvements (see plans titled "Keswick Hall Additions and Site Improvements"). Energy balance and channel protection for this analysis point are in compliance with all requirements. Stormwater quantity requirements for analysis point 2 will be met through the reduction in impervious area. Energy balance and channel protection for this analysis point are in compliance with all requirements. 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 with all requirements. FORM LID 204 ROUTE Keswick Road PROJECT Keswick Hall - CEP STORMWATER INLET COMPUTATIONS DESIGNER: AA CHECKED: SHEET 1 OF 1 DATE 7/18/2018 UNITS:NGLISH INLET H d dU v U w a 6i U U� x �6 3 H6i �Uw w w Uww W C) o Cv7w ° U�133 A x Sag Inlets Only c4 z� na s cGw' 606 DI-3B 6.000 0.320 0.65 0.208 0.000'RIGHT 0.208 4 0.832 0 0.832 0.0100 0.0400 3.396 2.000 0.5889 0.0833 2.0825 0.949 3.04 0.1266 0.1602 5.201 6.000 1.154 1.000 0.832 0.000 2.669 612 DI-9 1.000 0.040 0.90 0.036 0.000'RIGHT 0.036 4 0.144 0 0.144 0.0100 0.0208 3.280 2.000 0.6098 0.0220 1.0577 0.922 2.03 0.0845 0.0987 3.329 1.000 0.300 0.929 0.134 0.010 0.848 616 DI-9 1.000 0.030 0.90 0.027 WRIGHT 0.027 4 0.108 0 0.108 0.0100 0.0208 2.935 2.000 0.6814 0.0220 1.0577 0.955 2.03 0.0845 0.1015 2.901 1.000 0.345 0.959 0.104 0.004 0.761 INLETSOFT BY ENSOFTEC DATE: 7/18/2018 LD-229 PROJECT: Keswick Hall Central Energy Plant Demolition Designed by: AA STORM SEWER DESIGN COMPUTATIONS LOCATION: Keswick, VA STORM FREQUENCY 10 COUNTY: Charlottesville NOAA STATION: Checked by: UNITS I ENGLISH PIPE NO. FROM POINT TO POINT DRAIN. AREA "A" Acre (3) RUNOFF COEFF. "C" (4) CA TOTAL INLET TIME Minutes (7) RAIN FALL In/Hr (8) RUNOFF INVERT ELEVATIONS LENGTH of Pipe Ft. (12) SLOPE Ft./Ft. (13) SIZE (Dia. Or Span/Rise) In. (14) SHAPE Number of Pipes Capacity CFS (15) Friction Slope Ft./Ft. NORMAL FLOW FLOW TIME Sec. (17) REMARKS (18) INCRE- MENT (5) ACCUM- ULATED (6) Lateral CFS Total Q CFS (9) UPPER END (10) LOWER END (11) Depth of Flow, do Ft. Area of Flow, An SgFt Hm Ft. Vn Ft/Sec (16) En Ft. REFERENCE (1) STA. REFERENCE (2) STA. 601 602 600 0.00 0.00 0.00 5.00 0.00 0.00 2.46 431.00 430.41 29.44 0.02004 15 Circular 1 9.91 0.00130 0.42 0.37 0.24 6.70 1.12 4.40 603 604 600 1 0.00 0.00 0.54 5.10 5.02 0.00 2.74 431.16 426.51 55.21 0.08422 15 Circular 1 18.75 0.00190 0.32 0.25 0.19 10.91 2.17 5.06 605 606 604 0.32 0.65 0.21 0.54 5.04 5.03 0.00 2.74 432.73 431.26 31.44 0.04676 15 Circular 1 13.97 0.00190 0.38 0.31 0.21 8.84 1.59 3.56 607 608 606 0.61 0.55 0.34 0.34 5.00 5.04 0.00 1.69 432.94 432.83 10.74 0.01024 15 Circular 1 6.54 0.00070 0.43 0.38 0.24 4.47 0.74 2.40 611 612 610 0.04 0.90 0.04 0.10 5.23 4.98 0.00 0.50 437.55 437.00 26.82 0.02051 12 Circular 1 5.53 0.00020 0.20 0.11 0.12 4.36 0.50 6.15 613 614 612 0.04 0.90 1 0.04 0.04 5.00 5.04 0.00 0.18 438.52 437.65 43.47 0.02001 12 Circular 1 5.46 0.00000 0.13 0.06 0.08 3.22 0.29 13.50 615 616 1612 0.03 1 0.90 1 0.03 1 0.03 5.00 5.04 0.00 0.14 438.26 437.65 30.56 0.01996 12 Circular 1 5.45 0.00000 0.11 0.05 0.07 2.95 0.24 10.35 m,.an�.n..�...� ., Site Information . Post-oeveIoymentP,,j,d(Treatment Vuiome and Loads) eomiuni o.—nea ,o eM<eNr J iowieinuroee orevenreree. J r cover l.rml e. a �r o� e � rea n>ivri ao.a:imr �.noo.i onNl Drainage Area A Mainaae Area A land Cover 1.-0 A Soils B Soils C Soils D Soils Totals Land Cover Rv ForesVOpsn Space( acres) 0.00 0.00 Managed Turf(acres) 0.06 0.06 0.25 m pervious Cover (acres) 0.12 0.12 0.95 Total 0.18 Stormwater Rest Management Practices (RR = Runoff Reduction) 180718-Keswick Hell (C.E.P.}VRRM ReD-oorplienw 8praedsbee� ✓j_052018 DA. A Total Phosphorus Available for Removal in D.A. A (Ib/yr) 0.29 Post Development Treatment Volume in D.A. A (k)468 Runoff Managed Impervious Volume from Runoff Remaining Total BMP Phosphorus Phosphorus Load Untreated Phosphorus Remaining Downstream Practice to be Practice Reduction Turf Credit Cover Credit Upstream ' Reduction (k) Runoff Volume Treatment Removal from Upstream Phosphorus Load Removed By Phosphorus Load Employed Credit (%) Area (acres) Area (acres) Practice (k') (k') Volume (k') Efficiency (%) Practices (lb) to Practice (lb) Practice (lb) fib) S.a. Vegetated Roof #1(Spec #5) 45 0 0 0 0 0.00 0.00 0.00 1. b. Vegetated Roof #2 (Spec #5) E0 0 0 0 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) 2.d. To Dry WO or French Drain #1, I WIN 3. Permeable Pavement (RR) 4. Grass Channel (RR) 4o. Grass Channel A/B Soils (Spec #3) 5. Dry Swale (RR) 6. Bioretention (RR) 5. Dry Swale (RR) 6. Bioretention (RR) 7. Infiltration (RR) 8. Extended Detention Pond (RR) Nitrogen Nitrogen Load Untreated Nitrogen Remaining Removal from Upstream Nitrogen Load to Removed By Nitrogen Load Efficiency (%) Practices(lbs) Practice (Ibs) Practice(Ibs) (Ibs) 0 0.00 0.00 0.00 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) o o o Lavement (RR) 4. Grass Channel (RR) S. Dry Swale (RR) �6. (RR) ®®®®® 7. Infiltration (RR) 8. Extended Detention Pond (RR) 160716-K-i� Hall(C.E.P.)NFRM Re Dev_Complienre_6p-hea!_� 062016 DA. A B.b. ED.1 IS—.111 11 0 0 0 0 15 0.no 0.00 0.no ono 30 0.no 0.no ..no 0.00 9. Sheetflow to Filter/Open Space (RR) TOTAL IMPERVIOUS COVER TREATED (ac) 0.12 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac)l 0.06 AREA CHECK: OK. TOTAL RUNOFF REDUCTION IN D.A. A [W)j 187 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A (Ib/yr) 0.29 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) 0.16 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. A (lb/yr) 0.13 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS t Swale (no RR) 11. Filtering Practices (no RR) 12. Constructed Wetland (no RR) 13. Wet Ponds (no RR) 14. Manufactured Treatment Devices (no RR) TOTAL IMPERVIOUS COVER TREATED (ac) 0.12 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED(ac) 0.06 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (lb/yr) 0.11 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A (Ib/yr) 0.29 TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (lb/yr) 0.16 TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. A (Ib/yr) 0.16 TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. A (lb/yi 0.13 9. Sheetflow to TOTAL IMPERVIOUS COVER TREATED (ac) 0.12 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac)l 0.06 AREA CHECK: OK. TOTAL RUNOFF REDUCTION IN D.A. A [W)j 187 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A (Ib/yr) 0.29 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) 0.16 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. A (lb/yr) 0.13 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS t Swale (no RR) 11. Filtering Practices (no RR) 12. Constructed Wetland (no RR) 13. Wet Ponds (no RR) 14. Manufactured Treatment Devices (no RR) TOTAL IMPERVIOUS COVER TREATED (ac) 0.12 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED(ac) 0.06 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (lb/yr) 0.11 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A (Ib/yr) 0.29 TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (lb/yr) 0.16 TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. A (Ib/yr) 0.16 TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. A (lb/yi 0.13 9. Sheetflow to 14. Manufactured Treatment Devices (no RR) TOTAL IMPERVIOUS COVER TREATED (ac) 0.12 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED(ac) 0.06 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (lb/yr) 0.11 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A (Ib/yr) 0.29 TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (lb/yr) 0.16 TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. A (Ib/yr) 0.16 TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. A (lb/yi 0.13 9. Sheetflow to TOTAL IMPERVIOUS COVER TREATED (ac) 0.12 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED(ac) 0.06 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (lb/yr) 0.11 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. A (Ib/yr) 0.29 TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A (Ib/yr) 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (lb/yr) 0.16 TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. A (Ib/yr) 0.16 TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. A (lb/yi 0.13 9. Sheetflow to Filter/Open Space (RR) TOTAL RUNOFF REDUCTION IN D.A. A )ti 387 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A (lb/yr) 1 1.35 SEE WATER QUALITY COMPLIANCE TAB FOR SITE CALCULATIONS (Information Only) 10. Wet Swale (Coastal Plain) (no RR) zs a.DD DaD o.00 o.no 35 0.00 0.00 0.00 0.00 Practices (no RR) 0 r1l.Filtering ructed Wetland (no RR) ®®®® 0 13. Wet Ponds (no RR) 14. Manufactured BMP (no RR) 14. Manufactured BMP (no RR) SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. A(Ib/yrl 1.35 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. A Qb/yr( 0.00 TOTAL NITROGEN REMOVED IN D.A. A(Ib/yr) 1.35 Drainage Area B nrainaen Area A i and rnvnr t.,r i A Soils B Soils C Soils D Soils Totals land Cover Rv Forest/Open Spam (acres) 0.00 0.00 Managed Turf (acres) 0.00 0.00 Impervious Cover (acres) 0.00 0.00 Total 0.00 Storrnwatpr Rest Manaepmpnt Practices (RR = Runoff Reduction) 180716 - Keswick He (C.E.P.)-VRRM_ReDev_Carnpllance_Spreadsheet _0 052016 D.A. B Total Phosphorus Available for Removal in D.A. B (lb/yr) 0.00 Post Development Treatment Volume in D.A. B (ft') 0 __Gnln�r i.nm d.nndnwn lieie_ Phosphorus Untreated Runoff Managed Impervious Volumefrom Runoff Remaining Total Phosphorus Load from Phosphorus Phosphorus Remaining Downstream Practice to be Practice Reduction Turf Credit Cover Credit Upstream Reduction Ift') Runoff Treatment Removal Upstream Load to Removed By Phosphorus Employed Credit (%) Area (acres) Area (acres) Practice (fN) Volume (ft') Volume (ft') Efficiency (%) Practices (lb) Practice (lb) Practice (lb) Load (lb) 1.a. Vegetated Roof ##(Spec ft5) 45 0 0 0 0 0.00 0.00 0.00 1.b. Vegetated Roof ft2 (Spec ft5) 60 0 0 0 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) 2.a. Simple Disconnection to A/B Soils 2.b. Simple Disconnection to C/D Soils 2.c. To Soil Amended FiLr Path as per 2.d. To Dry Well or French Drain #1, 2.e. To Dry Well or French Drain #2, Micro -infiltration #2 (Spec #8) 2g. To Rain Garden #2, 2.h. To Rainwater Harvesting (Spec #6� 13. Permeable Pavement (RR) Is. Permeable Pavement #1 (Spec #71 It. Permeable Pavement #2 (Spec #71 4. Grass Channel (RR) 4.a. Grass Channel A/B Soils (Spec 43) 4.1b. Grass Channel C/D Soil, (Spec #3� 5. Dry Swale (RR) �6. Bioretention (RR) Nitrogen Nitrogen Load Untreated Nitrogen Remaining Removal from Upstream Nitrogen Load to Removed By Nitrogen Efficiency (%) Practices (Ibs) Practice (Ibs) Practice (Ibs) Load (Ibs) 0 0.00 0.00 0.00 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) 3. Permeable Pavement (RR) 4. Grass Channel (RR) 5. Dry Swale (RR) 6. Bioretention (RR) l/18 2018 5 of 25 2:59 PM 180716 - Keswick_Hall (C.E.P.)-VRRM_ReDev_C—pliance_Sp—d.heet_v3_052016 D.A. B 7. Infiltration (RR) 8. Extended Detention Pond (RR) 19. Sheetflow to Filter/Open Space (RR) 9.b. Sheetflow to Conservation Area, C/o Solis TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL TURF AREA TREATED(ac) 0.00 AREA CHECK: OK. TOTAL RUNOFF REDUCTION IN D.A. B (fP) 0 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. B (Ib/yr 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. B (Ib/yr 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. B (Ib/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS 110. Wet Swale (no RR) 1. Filtering Practices (no RR) 13. Wet Ponds (no RR) 60 0.00 0.00 0.00 0.00 7. Infiltration (RR) S. Extended Detention S. Extended Detention Pond (RR) 9. Sheetflow to Filter/Open Space (RR) TOTAL RUNOFF REDUCTION IN D.A. B (fP) 0 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. B (lb/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE CALCULATIONS (Information Only) 10. Wet Swale Plain) RR) (Coastal (no 11. Filtering Practices RR) (no 12. Constructed Wetland (no RR) 13. Wet Ponds (no RR) Vim 18 6025 2:69 PM 180716 - K,—k_Hall (C.E.P.)-VRRM_ReDev_Compliance_Spreatlsheet_v3_052016 D.A. B 14. Manufactured Treatment Devices RR) (no TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac) 0.00 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (Ib/yr) 0.11 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. B (Ib/yr 0.00 TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. B (Ib/yr 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. B (Ib/yr 0.00 TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. B (Ib/yr 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. B (Ib/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. B (Ib/yr 0.00 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. B (Ib/yr 0.00 TOTAL NITROGEN REMOVED IN D.A. B (Ib/yr) 0.00 14. Manufactured BMP RR) (no 71182 18 of 25 2:59 PM Drainage Area C nrainaee Area A i and rnver t.,r l A Soils B Soils C Soils D Soils Totals land Cover Rv Forest/Open Spam (acres) 0.00 0.00 Managed Turf (acres) 0.00 0.00 Impervious Cover (acres) 0.00 0.00 Total 0.00 Stormwatpr Rest Manaepmpnt Practices (RR = Runoff Reduction) 180716 - Keswick He (C.E.P.)-VRRM_ReDev_Carnpllance_Spreadsheet _JJ_052016 DA.0 Tota l Phosphorus Available for Remova l in D.A. Clb/yr) 0.00 Post Development Treatment Volume in D.A. C (fta) 0 ( __Gnln�r i.nm d.nndnwn lieie_ Runoff Managed Impervious Volumefrom Runoff Remaining Total BMP Phosphorus Untreated Phosphorus Phosphorus Remaining Practice Reduction Turf Credit Cover Credit Upstream Reduction Runoff Treatment Removal Load from Phosphorus Removed By Phosphorus Downstream Practice to be Credit (%) Area (acres) Area (acres) practice (fta) (fta) Volume (fit) Volume (fta) Efficiency (%) Upstream Load to Practice (lb) Load (lb) Employed Practices [lb) Practice (lb) 1.a. Vegetated Roof #1(Spec #5) 45 0 0 0 0 0.00 0.00 0.00 1.b. Vegetated Roof #2 (Spec #5) 60 0 0 0 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) 2.a. Simple Disconnection to A/B Soils 2.b. Simple Disconnection to CID Soils 2.c. To Soil Amended FiLr Path as per specifications (existing C/D soils) (Spec #4) 2 d To Dry Well or French Drain #1, 2.e. To Dry Well or French Drain #2, Micro -infiltration #2 (Spec #8) 2g. To Rain Garden #2, 2.h. To Rainwater Harvesting (Spec #6� 13. Permeable Pavement (RR) Is. Permeable Pavement 91 (Spec #71 It. Permeable Pavement #2 (Spec #71 4. Grass Channel (RR) 4.a. Grass Channel A/B Soils (Spec 43� 4.b. Grass Channel C/D Soil, (Spec #3� 5. Dry Swale (RR) �6. Bioretention (RR) Nitrogen Nitrogen Load Untreated Nitrogen Remaining Removal from Upstream Nitrogen Load to Removed By Nitrogen Efficiency (%) Practices (Ibs) Practice (Ibs) Practice (Ibs) Load (Ibs) 0 0.00 0.00 0.00 0 0.00 0.00 mM 0.00 2. Rooftop Disconnection (RR) 3. Permeable Pavement (RR) 4. Grass Channel (RR) S. Dry Swale (RR) 6. Bioretention (RR) l/18 2018 8 or 25 2:59 PM 180716- Keswick_Hall (C.E.P.)-VRRM_Rao- Compliance_Spreatlsheet_v3_052016 D.A. C 7. Infiltration (RR) 8. Extended Detention Pond (RR) 19. Sheetflow to Filter/Open Space (RR) 9.b. Sheetflow to Conservation Area, C/D Solis TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac) 0.00 AREA CHECK: OK. TOTAL RUNOFF REDUCTION IN D.A. C (ft') 0 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. C (lb/yr 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. C (lb/yr 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. C (Ib/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS - 10. Wet Swale (no RR) 1. Filtering Practices (no RR) 13. Wet Ponds (no RR) 60 0.00 0.00 0.00 0.00 7. Infiltration (RR) S. Extended Detention S. Extended Detention Pond (RR) 9. Sheetflow to Filter/Open Space (RR) TOTAL RUNOFF REDUCTION IN D.A. C (f[) 0 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. C (lb/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE CALCULATIONS (Information Only) 10. Wet Swale Plain) RR) (Coastal (no 11. Filtering Practices (no RR) 12. Constructed Wetland (no RR) 13. Wet Ponds (no RR) ]/18/ m 9 0f 25 2:69 PM 180716-K.—ick_Ha11(C.E.P.)-VRRM_R.D- Compliance_Spreatlsheet_v3_052016 D.A. C 114. Manufactured Treatment Devices RR) (no TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac)l 0.00 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (Ib/yr) 0.11 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. C (Ib/yr 0.00 TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. C (Ib/yr 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. C (Ib/yr 0.00 TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. C (Ib/yr 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. C (Ib/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. C (Ib/yr 0.00 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. C (Ib/yr 0.00 TOTAL NITROGEN REMOVED IN D.A. C (Ib/yr 0.00 14. Manufactured BMP (no RR) l/1M 18 10 of 25 2:59 PM Drainage Area D nrainaee Area A i and rnver t.,r l A Soils B Soils C Soils D Soils Totals land Cover Rv Forest/Open Spam (acres) 0.00 0.00 Managed Turf (acres) 0.00 0.00 Impervious Cover (acres) 0.00 0.00 Total 0.00 Stormwater Rest Management Practices (RR = Runoff Reduction) 180716 - Keswick He (C.E.P.)-VRRM_ReDev_Carnpllance_Spreadsheet _JJ_052016 DA.D Total Phosphorus Available for Removal in D.A. D (lb/yr) 0.00 Post Development Treatment Volume in D.A. D (fta) 0 __Gnln�r i.nm d.nndnwn lieie_ Runoff Managed Impervious Volumefrom Runoff Remaining Total BMP Phosphorus Untreated Phosphorus Phosphorus Remaining Practice Reduction Turf Credit Cover Credit Upstream Reduction Runoff Treatment Removal Load from Phosphorus Removed By Phosphorus Downstream Practice to be Credit (%) Area (acres) Area (acres) practice (fta) (fta) Volume (fta) Volume (fta) Efficiency (%) Upstream Load to Practice (lb) Load (lb) Employed Practices [lb) Practice (lb) 1.a. Vegetated Roof #1(Spec #5) 45 0 0 0 0 0.00 0.00 0.00 Lb. Vegetated Roof #2 (Spec #5) 60 0 0 0 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) 2.a. Simple Disconnection to A/B Soils 2.b. Simple Disconnection to C/D Soils 2.c. To Soil Amended FiLr Path as per specifications (existing C/D soils) (Spec #4) 2.d. To Dry Well or French Drain #1, 2.e. To Dry Well or French Drain #2, Micro -infiltration #2 (Spec #8) 2g. To Rain Garden #2, 2.h. To Rainwater Harvesting (Spec #6� 13. Permeable Pavement (RR) Is. Permeable Pavement #1 (Spec #71 It. Permeable Pavement #2 (Spec #71 4. Grass Channel (RR) 4.a. Grass Channel A/B Soils (Spec 43� 4.b. Grass Channel C/D Soil, (Spec #3� 5. Dry Swale (RR) �6. Bioretention (RR) Nitrogen Nitrogen Load Untreated Nitrogen Remaining Removal from Upstream Nitrogen Load to Removed By Nitrogen Efficiency (%) Practices (Ibs) Practice (Ibs) Practice (Ibs) Load (Ibs) 0 0.00 0.00 0.00 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) 3. Permeable Pavement (RR) 4. Grass Channel (RR) S. Dry Swale (RR) 6. Bioretention (RR) l/18 2018 11 or 25 2:59 PM 180716- Keswick_Hall (C.E.P.)-VRRM_Rao- Compliance_Spreatlsheet_v3_052016 D.A. D 7. Infiltration (RR) 8. Extended Detention Pond (RR) 19. Sheetflow to Filter/Open Space (RR) 9.b. Sheetflow to Conservation Area, C/D Solis TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac) 0.00 AREA CHECK: OK. TOTAL RUNOFF REDUCTION IN D.A. D (fe) 0 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. D (Ib/yr 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. D (Ib/yr 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. D (Ib/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS - 10. Wet Swale (no RR) 1. Filtering Practices (no RR) 13. Wet Ponds (no RR) 60 0.00 0.00 0.00 0.00 7. Infiltration (RR) S. Extended Detention S. Extended Detention Pond (RR) 9. Sheetflow to Filter/Open Space (RR) TOTAL RUNOFF REDUCTION IN D.A. D (ft') 0 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. D (Ib/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE CALCULATIONS (Information Only) 10. Wet Swale Plain) RR) (Coastal (no 11. Filtering Practices (no RR) 12. Constructed Wetland (no RR) 13. Wet Ponds (no RR) Vim 18 12 of 25 2:69 PM 180716-K.—ick_Ha11(C.E.P.)-VRRM_R.D- Compliance_Spreatlsheet_v3_052016 D.A. D 114. Manufactured Treatment Devices RR) (no TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac)l 0.00 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (Ib/yr) 0.11 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. D (Ib/yr 0.00 TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. D (Ib/yr 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. D (Ib/yr 0.00 TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. D (Ib/yr 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. D (Ib/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. D (Ib/yr 0.00 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. D (Ib/yr 0.00 TOTAL NITROGEN REMOVED IN D.A. D (Ib/yr 0.00 14. Manufactured BMP (no RR) l/1M 18 13 of 25 2:59 PM Drainage Area E nrainaee Area A i and rnver t.,r l A Soils B Soils C Soils D Soils Totals land Cover Rv Forest/Open Spam (acres) 0.00 0.00 Managed Turf (acres) 0.00 0.00 Impervious Cover (acres) 0.00 0.00 Total 0.00 Stormwater Rest Manaeement Practices (RR = Runoff Reduction) 180716 - Keswick He (C.E.P.)-VRRM_ReDev_Carnpllance_Spreadsheet _JJ_052016 D.A. E Total Phosphorus Available for Removal in D.A. E (lb/yr) 0.00 Post Development Treatment Volume in D.A. E (fta) 0 __Gnln�r i.nm d.nndnwn lieie_ Runoff Managed Impervious Volumefrom Runoff Remaining Total BMP Phosphorus Untreated Phosphorus Phosphorus Remaining Practice Reduction Turf Credit Cover Credit Upstream Reduction Runoff Treatment Removal Load from Phosphorus Removed By Phosphorus Downstream Practice to be Credit (%) Area (acres) Area (acres) practice (fta) (fta) Volume (fta) Volume (fta) Efficiency (%) Upstream Load to Practice (lb) Load (lb) Employed Practices(lb) Practice(lb) 1.a. Vegetated Roof #1(Spec #5) 45 0 0 0 0 0.00 0.00 0.00 Lb. Vegetated Roof #2 (Spec #5) 60 0 0 0 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) 2.a. Simple Disconnection to A/B Soils 2.b. Simple Disconnection to C/D Soils 2.c. To Soil Amended FiLr Path as per specifications (existing C/D soils) (Spec #4) 2.d. To Dry Well or French Drain #1, 2.e. To Dry Well or French Drain #2, Micro -infiltration #2 (Spec #8) 2g. To Rain Garden #2, 2.h. To Rainwater Harvesting (Spec #6� 13. Permeable Pavement (RR) Is. Permeable Pavement #1 (Spec #71 It. Permeable Pavement #2 (Spec #71 4. Grass Channel (RR) 4.a. Grass Channel A/B Soils (Spec 43� 4.b. Grass Channel C/D Soil, (Spec #3� 5. Dry Swale (RR) �6. Bioretention (RR) Nitrogen Nitrogen Load Untreated Nitrogen Remaining Removal from Upstream Nitrogen Load to Removed By Nitrogen Efficiency (%) Practices (Ibs) Practice (Ibs) Practice (Ibs) Load (Ibs) 0 0.00 0.00 0.00 0 0.00 0.00 0.00 2. Rooftop Disconnection (RR) 3. Permeable Pavement (RR) 4. Grass Channel (RR) S. Dry Swale (RR) 6. Bioretention (RR) l/18 2018 14 or 25 2:59 PM 180716- Keswick_Hall (C.E.P.)-VRRM_Rao- C—pliance_Sp—d.heet_v3_052016 D.A. E 7. Infiltration (RR) 8. Extended Detention Pond (RR) 19. Sheetflow to Filter/Open Space (RR) 9.b. Sheetflow to Conservation Area, C/D Solis TOTAL IMPERVIOUS COVER TREATED(ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac) 0.00 AREA CHECK: OK. TOTAL RUNOFF REDUCTION IN D.A. E (ft') 0 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. E (Ib/yr 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. E (Ib/yr 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING RUNOFF REDUCTION PRACTICES IN D.A. E (lb/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS - 10. Wet Swale (no RR) 1. Filtering Practices (no RR) 13. Wet Ponds (no RR) 60 0.00 0.00 0.00 0.00 7. Infiltration (RR) S. Extended Detention S. Extended Detention Pond (RR) 9. Sheetflow to Filter/Open Space (RR) TOTAL RUNOFF REDUCTION IN D.A. E (ft') 0 NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. E (lb/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE CALCULATIONS (Information Only) 10. Wet Swale Plain) RR) (Coastal (no 11. Filtering Practices (no RR) 12. Constructed Wetland (no RR) 13. Wet Ponds (no RR) 7/1M 18 15 of 25 2:69 PM 180716 - Keswick_Hall (C.E.P.)-VRRM_ReDev_Compliance_Spreatlsheet_v3_052016 D.A. E 14. Manufactured Treatment Devices RR) (no TOTAL IMPERVIOUS COVER TREATED (ac) 0.00 AREA CHECK: OK. TOTAL MANAGED TURF AREA TREATED (ac) 0.00 AREA CHECK: OK. TOTAL PHOSPHORUS REMOVAL REQUIRED ON SITE (Ib/yr) 0.11 TOTAL PHOSPHORUS AVAILABLE FOR REMOVAL IN D.A. E (Ib/yr 0.00 TOTAL PHOSPHORUS REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. E (Ib/yr 0.00 TOTAL PHOSPHORUS REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. E (I"yr 0.00 TOTAL PHOSPHORUS LOAD REDUCTION ACHIEVED IN D.A. E (Ib/yr 0.00 TOTAL PHOSPHORUS REMAINING AFTER APPLYING BMP LOAD REDUCTIONS IN D.A. E (Ib/yr 0.00 SEE WATER QUALITY COMPLIANCE TAB FOR SITE COMPLIANCE CALCULATIONS NITROGEN REMOVED WITH RUNOFF REDUCTION PRACTICES IN D.A. E (Ib/yr 0.00 NITROGEN REMOVED WITHOUT RUNOFF REDUCTION PRACTICES IN D.A. E (Ib/yr 0.00 TOTAL NITROGEN REMOVED IN D.A. E (Ib/yr 0.00 14. Manufactured BMP (no RR) 711& 18 16 d 25 2:59 PM Site Results (Water Quality Compliance) Area Checks rsr/qvm svgcE pr mpq mP mpr A I:q .ANAom 1— Eo l.r Site Treatment volume (ft') wlolololol� wotal Phph rus vw Ub/yr x RE"-D pb/vrl TP LOAD o llb/yrl Nq Ilh/yrl: —AININ—PLO- RE N REqulampb/yrl: TARGETTP REgURION E.LEE— ey a.as La/—R Total Nitrogen (For Information Purposesm/y) AO I m Im/yr) RrmAlxmq PosrarvELovn7rm xirRgnrx Lggo llh/yrj Runoff Volume and Curve Number Calculations Enter design storm rainfall depths (in): 1-year storm 3-year storm IB-yearstorm OAAAdoz sa(nrcA/�m<. .gov/taz4A/d:/ •Notes (ue below): 11111 "ff-I. eswmpuceam Ih,I spreadsheetfor each drainagearea are limited in-irappli-ilityfor aeterminingana aemonsI—g compliance-h water quantity uaements.5ee VRPM Users Guide antl Documentation for aatliti.nal informrtion. (21 Ru me(RV l for pre-antl post-tlevelopmem drainage areas must bein volume[n<units le.g crPfeet or <.bi< feet)wM1en using the Energy ga — Equation. Runoff measured in Vncnes and shown in [ne zpreaesnee[ as Rvlwa[ersM1ed inch) can only be usetl in roe Energy Balance Equation when roe pm and post-0evelopmen[ drainage areas are equal. ONemise Rvlwa[ersnetl-in<M1)mun bem ped by[M1e tlrainagearea. 131 Atlua reb—donrunoR retluttion volumes as Calculated in D.A. tabs. An a —ti- CN Vegetatetl Poofs is included in BMP sce MkIion N.. 5. Drainage Area Curve Numbers and Runoff Depths Curve numbers (CN, CNadj) and runandepths (RV are computed with and without reduction practices. Drainage Ate.A AS.ils BSails CSoils DS.ils Area Wn't): 0.18 fgrezt/open seam-unainurbea, proteaea red lacresl punq%Raauttlon —1/q , spacer reforeztetl land melh'1: 1E] anagetl Turf-d.--, graded f.rvarmarpmer red lanes) turtrobe mowetl/managed m rvi.. .ve red lacresl CN — 0 1-year storm 2-ye,u Mn, ID -year storm RV..velepea t—n—ed-inch) with no Runoff Reduction' RV._., with Run.%Reduction" Adlusted CN` 1.11 1.19 *See Notes above RV..velepea (watershed -Inch) with na RV.,,.,_ (watershed -inch) with RV,.wlep.e (watershed -inch) with no Runoff Reduction` RVo.veerea (watershed -inch) with Runoff Reduction' Adlusted CN" Drainage Are.D ASoils BSails CS.ils DSoils men )oared): 0.00 forezt/0ce5paa-una'mumea, protected red lacresl f.rezVopen space or ref.rezt.d land 0 anagetl turfrob. Turf-.1,bed,gratled f.ryaNz.r.tM1er red lacresl mowed/mana d r red la[rezl CNI.A..1 0 1-year storm 2-year storm 10.year storm RVoewlapm (waNnhed-inch) with no Run.%Reduction" RVmvem (watershed -inch) with Run.ff Reducti.n" Adlusted CN` See Natez ahnue Drainage—E ASolls B5oils CSoils D5oi15 Area parer: o.00 Forest/Oce Space- unalzturbea,proteaed red lanes) pun.%Retluttie I. /.pen space., reforested 30meIRaI: 0 anagetl Turf -disturbed, gratled f.ryaNz.r.tM1er red lacresl turfto be mowed/mana tl r red lanes) CNmw n 0 1-year storm 2-year storm 10.year storm RVoewlapm (watershed -inch) with no Run.ff Reduction" RV._.,_(watershed-inch) with Ru..%Reducti.n" Adjusted CN` See Nntez ahnue Virginia Runoff Reduction Method Worksheet DEQ Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet - Version 3.0 BMP Design Specifications List: 2013 Draft Stds & Specs Site Summary Total Rainfall (in): 43 Total Disturbed Acreage: 2.28 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 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.00 0.00 1.75 1.75 77 Impervious Cover (acres) 0.00 0.00 0.00 0.53 0.53 23 2.28 100 Post-ReDevelopment Land Cover (acres) A soils B Soils C Soils D Soils Totals % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.00 0.00 1.95 1.95 86 Impervious Cover (acres) 0.00 0.00 0.00 0.33 0.33 14 2.28 100 Site Tv and Land Cover Nutrient Loads Final Post -Development Post Post- Adjusted Pre- (Post-ReDevelopment ReDevelopment Development ReDevelopment Impervious) & New Im p ) (New Impervious) Site Rv 0.35 0.35 0.41 Treatment Volume (ft) 2,908 2,908 3,416 TP Load (lb/yr) 1 1.83 1.83 2.15 Total TP Load Reduction Required (lb/yr) 0.11 0.11 0 Final Post -Development Load (Post-ReDevelopment & New Impervious) Pre- ReDevelopment TN Load (lb/yr) 13.07 15.35 Site Compliance Summary Maximum % Reduction Required Below 20% Pre-ReDevelopment Load Pre- ReDevelopment Final Post -Development Post-ReDevelopment TP TP Load per acre TP Load per acre Load per acre (lb/acre/yr) (lb/acre/yr) (lb/acre/yr) 0.94 0.80 0.80 Summary Print Virginia Runoff Reduction Method Worksheet Total Runoff Volume Reduction (ft) 187 Total TP Load Reduction Achieved (lb/yr) 0.16 Total TN Load Reduction Achieved (lb/yr) 1.35 Remaining Post Development TP Load 1.67 (lb/yr) Remaining TP Load Reduction (lb/yr) Required 0.00 Drainage Area Summary ** TARGET TP REDUCTION EXCEEDED BY 0.05 LB/YEAR ** IIIIIIIIIIiL 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 0.00 0.00 Managed Turf (acres) 0.06 0.00 0.00 0.00 0.00 0.06 Impervious Cover (acres) 0.12 0.00 0.00 0.00 0.00 0.12 Total Area (acres) 0.18 0.00 0.00 0.00 0.00 0.18 Drainage Area Compliance Summary D.A. A D.A. B D.A. C D.A. D D.A. E Total TP Load Reduced (lb/yr) 0.16 0.00 0.00 0.00 0.00 0.16 TN Load Reduced (lb/yr) 1.35 0.00 0.00 0.00 0.00 1.35 Drainage Area A Summary Land Cover Summary A Soils B Soils C Soils D Soils Total % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.00 0.00 0.06 0.06 33 Impervious Cover (acres) 0.00 0.00 0.00 0.12 0.12 67 0.18 BMP Selections Managed Turf Impervious BMP Treatment TP Load from Untreated TP Load TP Removed TP Remaining Downstream Treatment Practice Credit Area Cover Credit I 3 Volume (ft ) Upstream to Practice (Ibs) (lb/yr) (lb/yr) to be Employed (acres) Area (acres) Practices (Ibs) Total Impervious Cover Treated (acres) 0.12 Total Turf Area Treated (acres) 0.06 Summary Print Virginia Runoff Reduction Method Worksheet Total TP Load Reduction Achieved in D.A. (lb/yr) 0.16 Total TN Load Reduction Achieved in D.A. 1.36 (lb/yr) Drainage Area B Summary Land Cover Summary A Soils B Soils C Soils D Soils Total % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.00 0.00 0.00 0.00 0 Impervious Cover (acres) 0.00 0.00 0.00 0.00 0.00 0 0.00 BMP Selections Managed Turf Impervious BMP Treatment TP Load from Untreated TP Load TP Removed TP Remaining Downstream Treatment Practice Credit Area Cover Credit I 3 Volume (ft) Upstream to Practice (Ibs) (Ib/yr) (Ib/yr) to be Employed (acres) Area (acres) Practices (Ibs) Total Impervious Cover Treated (acres) 0.00 Total Turf Area Treated (acres) 0.00 Total TP Load Reduction Achieved in D.A. (lb/yr) 0.00 Total TN Load Reduction Achieved in D.A. (lb/yr) 0.00 Drainage Area C Summary Land Cover Summary A Soils B Soils C Soils D Soils Total % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.00 0.00 0.00 0.00 0 Impervious Cover (acres) 0.00 0.00 0.00 0.00 0.00 0 0.00 BMP Selections Managed Turf Impervious BMP Treatment TP Load from Untreated TP Load TP Removed TP Remaining Downstream Treatment Practice Credit Area Cover Credit I 3 Volume (ft) Upstream to Practice (Ibs) (lb/yr) (lb/yr) to be Employed (acres) Area (acres) Practices (Ibs) Total Impervious Cover Treated (acres) 0.00 Total Turf Area Treated (acres) 0.00 Summary Print Virginia Runoff Reduction Method Worksheet Total TP Load Reduction Achieved in D.A. (lb/yr) 0.00 Total TN Load Reduction Achieved in D.A. (lb/yr) 0.00 Drainage Area D Summary Land Cover Summary A Soils B Soils C Soils D Soils Total % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.00 0.00 0.00 0.00 0 Impervious Cover (acres) 0.00 0.00 0.00 0.00 0.00 0 0.00 BMP Selections Managed Turf Impervious BMP Treatment TP Load from Untreated TP Load TP Removed TP Remaining Downstream Treatment Practice Credit Area Cover Credit I 3 Volume (ft) Upstream to Practice (Ibs) (Ib/yr) (Ib/yr) to be Employed (acres) Area (acres) Practices (Ibs) Total Impervious Cover Treated (acres) 0.00 Total Turf Area Treated (acres) 0.00 Total TP Load Reduction Achieved in D.A. (lb/yr) 0.00 Total TN Load Reduction Achieved in D.A. (Ib/yr) 0.00 Drainage Area E Summary Land Cover Summary A Soils B Soils C Soils D Soils Total % of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acres) 0.00 0.00 0.00 0.00 0.00 0 Impervious Cover (acres) 0.00 0.00 0.00 0.00 0.00 0 0.00 BMP Selections Managed Turf Impervious BMP Treatment TP Load from Untreated TP Load TP Removed TP Remaining Downstream Treatment Practice Credit Area Cover Credit I 3 Volume (ft ) Upstream to Practice (Ibs) (lb/yr) (lb/yr) to be Employed (acres) Area (acres) Practices (Ibs) Total Impervious Cover Treated (acres) 0.00 Total Turf Area Treated (acres) 0.00 Summary Print Virginia Runoff Reduction Method Worksheet Total TP Load Reduction Achieved in D.A. (lb/yr) 0.00 Total TN Load Reduction Achieved in D.A. (lb/yr) 0.00 Runoff Volume and CN Calculations 1-year storm 2-year storm 30-year storm Target Rainfall Event (in) 1 2.92 3.54 5.35 Drainage Areas RV & CN Drainage Area A Drainage Area B Drainage Area C Drainage Area D Drainage Area E CN 92 0 0 0 0 RR (ft) J'RIV 187 0 0 0 0 1-year return periodVwRR(ws-in) wo RR (ws-in) 2.09 0.00 0.00 0.00 0.00 1.80 0.00 0.00 0.00 0.00 CN adjusted 89 0 0 0 0 2-year return period RV wo RR (ws-in) 2.68 0.00 0.00 0.00 0.00 RV w FIR (ws-in) 2.39 0.00 0.00 0.00 0.00 CN adjusted 89 0 0 0 0 10-year return period RV wo RR (ws-in) 4.43 0.00 0.00 0.00 0.00 RV w RR (ws-in) 4.14 0.00 0.00 0.00 0.00 CN adjusted 89 0 0 0 0 Summary Print 180716 - Keswick —Hall (C.E.P.)-VRRM_ReDev_Compliance_ Spreadsheet_v3_052016 Version 2.8 - June 2014 - 2011 BMP Stds & Specs 1 Fixed summary sheet - totals /percentage column fixed 2 Corrected nitrogen efficiency percentages 3 Corrected the Rv value in column J for managed turf 4 Checked and revised runoff reduction credit values assigned Version 3.0 - 2011 and draft 2013 BMP Stds & Specs General 1 Added error checks and user prompts to Site tab, DA tabs, and Runoff Volume and CN tab for data input errors. 2 Various format changes thoughout the spreadsheet. 3 Combined 2011 and 2013 BMP spreadsheets into one spreadsheet with a user selection option included in Site tab. 4 User input cell color changed from cyan blue to green; calculation cells changed from mid -grey to light grey; and added final result cell in indigo. Site tab 5 Locked annual rainfall of 43 inches for use throughout Virginia since regulatory site based TP load limit is based on this value. 6 Corrected error in formula for total phosporus load reduction requirement. Previous formula was inconsistent with 9VAC25-870-63 A.2 and under certain circumstances provided erroneous TP load reduction requirement for development on prior developed lands. 7 Added button and shortcut (Ctrl+Shift+R) to clear user inputs from all worksheets. 8 Added shortcut (Ctrl+Shift+D) to clear land cover data from Site tab. 9 Added TP Baseline Load for adjusted pre-redevelopement portion (cell C58). 10 Added note (triggered to appear when applicable) below "Land Cover Summary for Redevelopment'- indicating that reduction below baseline TP load (<0.41 Ibs/acre) not required as per 9VAC25-870-63. 11 Added error messages when data input areas incomplete or not entered correctly. 12 Conditional formatting (Summary sections grayed out) when input information incomplete or incorrect. 13 Added Pre -redevelopment and Post -development load in Ibs/acre/yr (row 57) for additional comparison purposes 14 Corrected error in excel formula for new impervious cover Rv. 15 Corrected errors in excel formula for total site area and Rv's in redevelopment portion: error appeared when soil types change between pre -redevelopment and post -development with no net increases in impervious increase. 16 Added section for Final Post -Development to Land Cover Summaries to show combination of redevelopment portion and new net impervious cover portion. 17 Added informational section in blue (columns B to F, rows 12-14) and input/error guide (columns H to K, rows 12-14) to indicate to users upfront when new net impervious cover is being triggered, when 10 or 20 % reductions are being utilized, and when data entry is completed correctly. 18 Added data entry instruction when user inputs blank (row 8). 19 Added option for linear development projects (row 6, and cells D64-G64) D.A. tabs 20 Added MTDs: Hydrodynamic, Filtering, Generic. 21 Added "Total BMP Treatment Volume (W)" column. 22 Rearranged previous Turf and Impervious input rows to adjacent cells in same row so each practice now located on 1 row only. 23 Consolidated BMP Practice heading and added (RR or no RR label) to each practice to identify those with and without Runoff Reduction. 24 Added " Total Phosphorus Available for Removal in D.A. _ (Ibs)". 25 Added button to clear BMP credit areas entered for each practice. 26 Added user prompts to assist with user -input Rainwater Harvesting runoff reduction credit, and MTDs. 27 Renamed Credit and Phosphorus/Nitrogen Efficiency column headers to Runoff Removal Credit and Phosphorus/Nitrogen Removal Efficiency for clarity. 28 Removed "RR" from Column headings referring to runoff volume and TP load from upstream practices (which may be RR or non -RR practices). 29 Renamed "l 0. Wet Swale (Coastal Plain)" to "10. Wet Swale" in BMP heading in order to improve clarity. The practice is well suited for but not limited to the Coastal Plain. 30 Renamed "14. Manufactured BMPs" section heading to "14. Manufactured Treatment Device"s for consistency with Virginia BMP Clearinghouse. 31 Added "Micro-Bioretention #1" and "Micro-Bioretention #2" to Bioretention headings (6.a and 6.b on tab, respectively) from Spec 9. 32 Replaced zero values from all data entry cells with blank cells, blocked out calculation and data entry cells where input or calculations are not applicable. Water Quality Compliance tab 33 Optimized and reorganized for improved information output. 34 Added "Runoff Reduction Volume and TP By Drainage Area". 35 Added section for linear development projects (rows 21-26) Runoff Volume and CN tab 36 Reorganized and renamed Channel and Flood Protection tab to Runoff Volume and CN to more accurately reflect information provided. 37 Added user notes regarding limitations of Runoff Volume and CN tab for water quantity calculations. 38 Renamed CNw i,ihred to CNio.A. xl for the CNs based on soils and land cover types for each drainage area Summary tab 39 Added "Print Preview" button. 40 Fixed runtime error in Summary tab update macro. 41 Added "BMP Treatment Volume", "TP Load from Upstream practice", 7P Removed" and "TP remaining" columns to Summary tab. 42 Optimized macro efficiency and eliminated screen updating/flashing during macros. 43 Corrected Summary tab macro -Turf missing routine missing "<>". 44 Added additional pre and post site data onto Summary tab. 45 Added Error Summary Table to Summary tab (appears only if errors on Site tab or Drainage Area tabs are present) 46 Expanded and improved Runoff Coefficient and CN calculation section. 47 Added summary information for linear projects, only populates if applicable. 1 S 10S Pre Area 1-2 (Onsite) 11 L [:1 5L Pre Area 1-1 (Offsite) Areas Combined ( Pre Total Areas Combined 14S 1-2 + Pre 1-3) (Pre 1-1 + Pre 1-2 + Pre 1-3) Pre Area 1-3 (Onsite) Pre Area 2-1 (Onsite) Pre Area 3-1 (Onsite) Subcat Reach on Link Keswick Hall_C.E.P. (PRE) Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 2.060 80 >75% Grass cover, Good, HSG D (1S, 2S, 10S, 12S, 14S) 0.710 98 Paved parking, HSG D (1 S, 2S, 10S, 12S, 14S) 2.770 85 TOTAL AREA Keswick Hall_C.E.P. (PRE) Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 2.770 HSG D 1 S, 2S, 10S, 12S, 14S 0.000 Other 2.770 TOTAL AREA Keswick Hall C.E.P. (PRE) Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 0.000 2.060 0.000 2.060 >75% Grass cover, Good 1 S, 2S, 10S, 12S, 14S 0.000 0.000 0.000 0.710 0.000 0.710 Paved parking 1 S, 2S, 10S, 12S, 14S 0.000 0.000 0.000 2.770 0.000 2.770 TOTAL AREA Keswick Hall_C.E.P. (PRE) Type 1124-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 5 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 Subcatchment1S: Pre Area 1-2 (Onsite) Runoff Area=0.340 ac 2.94% Impervious Runoff Depth>1.25" Tc=7.0 min CN=81 Runoff=0.72 cfs 0.035 ai Subcatchment2S: Pre Area 3-1 (Onsite) Runoff Area=0.260 ac 30.77% Impervious Runoff Depth>1.58" Tc=30.0 min CN=86 Runoff=0.36 cfs 0.034 of Subcatchment10S: Pre Area 1-1 (Offsite) Runoff Area=0.490 ac 36.73% Impervious Runoff Depth>1.67" Tc=7.0 min CN=87 Runoff=1.37 cfs 0.068 ai Subcatchment12S: Pre Area 2-1 (Onsite) Runoff Area=0.970 ac 19.59% Impervious Runoff Depth>1.45" Tc=7.0 min CN=84 Runoff=2.38 cfs 0.117 of Subcatchment14S: Pre Area 1-3 (Onsite) Runoff Area=0.710 ac 35.21% Impervious Runoff Depth>1.59" Tc=8.0 min CN=86 Runoff=1.84 cfs 0.094 of Link 11 L: Areas Combined ( Pre 1-2 + Pre 1-3) Inflow=2.56 cfs 0.130 of Primary=2.56 cfs 0.130 of Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Inflow=3.93 cfs 0.198 of Primary=3.93 cfs 0.198 of Total Runoff Area = 2.770 ac Runoff Volume = 0.349 of Average Runoff Depth = 1.51" 74.37% Pervious = 2.060 ac 25.63% Impervious = 0.710 ac Keswick Hall_C.E.P. (PRE) Type // 24-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 1 S: Pre Area 1-2 (Onsite) Runoff = 0.72 cfs @ 11.99 hrs, Volume= 0.035 af, Depth> 1.25" 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 0.010 98 Paved parking, HSG D 0.330 80 >75% Grass cover, Good, HSG D 0.340 81 Weighted Average 0.330 97.06% Pervious Area 0.010 2.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 1 S: Pre Area 1-2 (Onsite) Hydrograph -I-t-1-tt-1-t-I-t-1-1-- 0.8 J -L 1 L J I 1 I L J 1 -1 1 - I C J ■Runoff 0.75 0.72 cfs- 0.7 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Type MI 0.65 n24-hr �ri1HiIIb.2�`'- 1 0.6 --I-T-I-77-1-T-1-7J 7-I-T Riff -Ate -0.340-arc 0.55 -I- T -I- L- J -I- T -I- -L J -1- -1- 1--1---Ln-I-� - 0.5 RunofflVdlume-0.035 ef F 0.45 - I- -I - - I- -I - -I 1 1I�I �� '1off ' 3 0.4 o - 1 T 1 T T 1 T 1 -F -1 7 I""TP 7"" I I T 1 1 7-TCi:'7-.O-rhi-1 LL 0.35 0.3 -1 -1- 1 -1- L J - I- 1 -I- L J 1 -I- L -I - I- -L -I- L CNr-811- 0.25 1 1 1 1 1 1 1 1 1 1 1 1 - 1 1 1 1 1 1 1 1 1 1 1 0.2 1 - - 1 1 1 - - - 1 1 - - - - 1 1 - - 1 1 1 - - - - 1 1 1 1 1 1 1 1 1 1 1 - - - - - - - - - - - - - - - 0.15 t -1 1 T I T T 1 T I T-1 1 F 1 1 T 1 F T 0.1 -4 _I- + -I- -I- + -I- + -I- + -I 1- + -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) Keswick Hall_C.E.P. (PRE) Type // 24-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 2S: Pre Area 3-1 (Onsite) Runoff = 0.36 cfs @ 12.25 hrs, Volume= 0.034 af, Depth> 1.58" 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 1-Yr Rainfall=2.92" Area (ac) CN Description 0.080 98 Paved parking, HSG D 0.180 80 >75% Grass cover, Good, HSG D 0.260 86 Weighted Average 0.180 69.23% Pervious Area 0.080 30.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.0 Direct Entry, Subcatchment 2S: Pre Area 3-1 (Onsite) Hydrograph --7-1-77-1-T-1-7---1-7-1-r-1 1--1-r7- 0.4 I T 1 T T T 1 T--1T 1 T F-1 ■Runoff 0.38 -1— T 1 T T F T 1 T o.ss T— 1 F 7 T 1 F T 0.36 TypiI-Mo-h f 1 T 1 1 1 1 1 1 1 1 1 1 1 1 1 0.34 0.32 — — — —— — — — — — — — — — — I 1 I_ I I I � nia — — — — — — — — — — — — — — — — I I I I I I I I I I I 0.3 0.28 1 1 �u ho -Arda#:0l.2s9lad I I I I I I I I I I 1 1 0.26 1 1 1 11/ 11 1 1 1 1 1 1 Runoff 1Volume=0.034-a 1 1 1 -1- 1 -1- 1 1- 1 0.24 v 0.22 v�'- 11 11- 11 3 0.2af 018 1 "'I"-r"l>I -� ��30.0 riili _I_ -I - 1 _I -I - -11 - I- - -I - - _I_ _I_I_ _I_ _I_ _ ALL 0.16 1 ��+11 1 �1�� 1 1 1 1 1 1 1 CN#86-1_ I_ I 1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1_ 0.14 _1_ _I_ _I_ _I_I_ _I_ _1_ 0.12 1 1 1 1 1 1 1 1 1 1 1II 0.1 0.08 I I 1 I T I I I I L I I I L 1 1 I 0.06 I I L —I-L I I I L-1 1 L 1 1 0.04 I _ I -I— L J 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) Keswick Hall_C.E.P. (PRE) Type // 24-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 10S: Pre Area 1-1 (Offsite) Runoff = 1.37 cfs @ 11.98 hrs, Volume= 0.068 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 0.180 98 Paved parking, HSG D 0.310 80 >75% Grass cover, Good, HSG D 0.490 87 Weighted Average 0.310 63.27% Pervious Area 0.180 36.73% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 10S: Pre Area 1-1 (Offsite) Hydrograph 1$7 cfs Type Ili 24-hr 1,Yr1 Painfall=2.02" 'Runoff Aeea=0.490 a6 11 1 1 1 1 I I I I I I I I Runoff lVmlume=0.068 of I Ou;nOff',Depth>1.1,671' 1 1 1 1 1 Tc=7.,O Min LL CN;:817 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 Keswick Hall_C.E.P. (PRE) Type // 24-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 12S: Pre Area 2-1 (Onsite) Runoff = 2.38 cfs @ 11.99 hrs, Volume= 0.117 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 0.190 98 Paved parking, HSG D 0.780 80 >75% Grass cover, Good, HSG D 0.970 84 Weighted Average 0.780 80.41 % Pervious Area 0.190 19.59% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, N 3 0 LL 2 0 Subcatchment 12S: Pre Area 2-1 (Onsite) Hydrograph I I I I I I I I I I — — — —I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I Type Ili 24-hr 47Yr Rainfalt= . I' 'Runbff Area=0.970 ad I I I I I I I I Runoff lVmlume=0.117 of Ou;nOff IlDepth>1.4451' Tc=7.10 M i n CN;=84 I I I 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) ❑ Runoff Keswick Hall_C.E.P. (PRE) Type // 24-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment 14S: Pre Area 1-3 (Onsite) Runoff = 1.84 cfs @ 11.99 hrs, Volume= 0.094 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 0.250 98 Paved parking, HSG D 0.460 80 >75% Grass cover, Good, HSG D 0.710 86 Weighted Average 0.460 64.79% Pervious Area 0.250 35.21 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 14S: Pre Area 1-3 (Onsite) Hydrograph 2 1.84 efs Type Ili 24-hr 1,Yr, Painfall=2.026' IRunbff Area=0.710 ad Runoff iVmlume=0.094 of y - - - - - *unOff',Dept6 LL Tc=8.'0 M i n CN;=86 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 Keswick Hall_C.E.P. (PRE) Type 1124-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 11 Summary for Link 11L: Areas Combined ( Pre 1-2 + Pre 1-3) Inflow Area = 1.050 ac, 24.76% Impervious, Inflow Depth > 1.48" for 1-Yr event Inflow = 2.56 cfs @ 11.99 hrs, Volume= 0.130 of Primary = 2.56 cfs @ 11.99 hrs, Volume= 0.130 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs N V 3 0 LL Link 11 L: Areas Combined ( Pre 1-2 + Pre 1-3) Hydrograph 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) ❑ Inflow ❑ Primary Keswick Hall_C.E.P. (PRE) Type 1124-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 12 Summary for Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Inflow Area = 1.540 ac, 28.57% Impervious, Inflow Depth > 1.54" for 1-Yr event Inflow = 3.93 cfs @ 11.99 hrs, Volume= 0.198 of Primary = 3.93 cfs @ 11.99 hrs, Volume= 0.198 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs N V 3 0 LL Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Hydrograph 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) ❑ Inflow ❑ Primary Keswick Hall_C.E.P. (PRE) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 13 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 Subcatchment1S: Pre Area 1-2 (Onsite) Runoff Area=0.340 ac 2.94% Impervious Runoff Depth>1.74" Tc=7.0 min CN=81 Runoff=1.00 cfs 0.049 of Subcatchment2S: Pre Area 3-1 (Onsite) Runoff Area=0.260 ac 30.77% Impervious Runoff Depth>2.12" Tc=30.0 min CN=86 Runoff=0.48 cfs 0.046 of Subcatchment10S: Pre Area 1-1 (Offsite) Runoff Area=0.490 ac 36.73% Impervious Runoff Depth>2.22" Tc=7.0 min CN=87 Runoff=1.80 cfs 0.090 of Subcatchment12S: Pre Area 2-1 (Onsite) Runoff Area=0.970 ac 19.59% Impervious Runoff Depth>1.97" Tc=7.0 min CN=84 Runoff=3.21 cfs 0.159 of Subcatchment14S: Pre Area 1-3 (Onsite) Runoff Area=0.710 ac 35.21 % Impervious Runoff Depth>2.13" Tc=8.0 min CN=86 Runoff=2.45 cfs 0.126 of Link 11 L: Areas Combined ( Pre 1-2 + Pre 1-3) Inflow=3.45 cfs 0.175 of Primary=3.45 cfs 0.175 of Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Inflow=5.24 cfs 0.266 of Primary=5.24 cfs 0.266 of Total Runoff Area = 2.770 ac Runoff Volume = 0.471 of Average Runoff Depth = 2.04" 74.37% Pervious = 2.060 ac 25.63% Impervious = 0.710 ac Keswick Hall_C.E.P. (PRE) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 14 Summary for Subcatchment 1 S: Pre Area 1-2 (Onsite) Runoff = 1.00 cfs @ 11.99 hrs, Volume= 0.049 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 2-YR Rainfall=3.54" Area (ac) CN Description 0.010 98 Paved parking, HSG D 0.330 80 >75% Grass cover, Good, HSG D 0.340 81 Weighted Average 0.330 97.06% Pervious Area 0.010 2.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 1 S: Pre Area 1-2 (Onsite) Hydrograph I I I 1 00 cfs 1 Type Ili 24-hr -YR, Rainfall=3.51 41' 'Runbff Area=0.340 ad I I I I I I I I Runoff iVmlume=0.049 of I Ou;nOff'IDepth>1.'741' ' ' ' 1 ' Tc=7.,O Min LL CN;:81 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) 0 Runoff Keswick Hall_C.E.P. (PRE) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment 2S: Pre Area 3-1 (Onsite) Runoff = 0.48 cfs @ 12.24 hrs, Volume= 0.046 af, Depth> 2.12" 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 0.080 98 Paved parking, HSG D 0.180 80 >75% Grass cover, Good, HSG D 0.260 86 Weighted Average 0.180 69.23% Pervious Area 0.080 30.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.0 Direct Entry, Subcatchment 2S: Pre Area 3-1 (Onsite) Hydrograph I l l l i I l l l i I I I I I 0.5 TI !I� w o.ae ypell 0.45 4p'I . f _ ww !' 0.4 1 Ru I+W I—Ard&::01.26a lei — — — — — — — — — — — — — — — — 0.35 1 Runoff Volume=4.046of w 0.3 1 " 1 1 I I I Dino-T � >12.121 _ 0 LL 0.25 Fc:30.01 Min l 0.2 1^ NP= 816 1 1 1 1 1 1 I I I I I I I T 1 F- 1 I i I I T 0.15 I I I I I I I i I I I 0.1 V I I I I nns I I I I I I I I I I I 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) ❑ Runoff Keswick Hall_C.E.P. (PRE) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment 10S: Pre Area 1-1 (Offsite) Runoff = 1.80 cfs @ 11.98 hrs, Volume= 0.090 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 0.180 98 Paved parking, HSG D 0.310 80 >75% Grass cover, Good, HSG D 0.490 87 Weighted Average 0.310 63.27% Pervious Area 0.180 36.73% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, 2 Subcatchment 10S: Pre Area 1-1 (Offsite) Hydrograph t —I - I I I l l I I I I I 1.80 cfs 1 1 Type Ili 24-hr -YR, Rainfall=3.51 41' 1 'Runbff Area=0.490 ad I I I I I I I I Runoff lVmlume=0.090 of -0-u ngff 11 Depth*11 2-,'2216' 1 1 1 1 Tc=7.10 Min I I I I I I I I I CN;:87 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 Keswick Hall_C.E.P. (PRE) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 17 Summary for Subcatchment 12S: Pre Area 2-1 (Onsite) Runoff = 3.21 cfs @ 11.98 hrs, Volume= 0.159 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 0.190 98 Paved parking, HSG D 0.780 80 >75% Grass cover, Good, HSG D 0.970 84 Weighted Average 0.780 80.41 % Pervious Area 0.190 19.59% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, 3 w 2 3 0 LL fl Subcatchment 12S: Pre Area 2-1 (Onsite) Hydrograph C -——T-1—-—-1——-1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I T I I I I I I I I I T 1 I I I I I I I I 1 I I I I I I I I I I I I 1 T 1 I I i I I I ■Runoff I I I I I I I I I I I 1 T-Type Ai 24-hr _YR; Rlainfall=3.541' IRunbff Area=0.970 at I I I I I I I I Runoff) Vol ume=O 159 of Ou;nOff',Depth>1.07" Tc=7.,0 Min CN;:84 T I T 1 T 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) Keswick Hall_C.E.P. (PRE) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment 14S: Pre Area 1-3 (Onsite) Runoff = 2.45 cfs @ 11.99 hrs, Volume= 0.126 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 0.250 98 Paved parking, HSG D 0.460 80 >75% Grass cover, Good, HSG D 0.710 86 Weighted Average 0.460 64.79% Pervious Area 0.250 35.21 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 14S: Pre Area 1-3 (Onsite) Hydrograph � � I I I I I ❑Runoff 2 as cfs Type Ili 24-hr - I— + - - `kRF R- ainfall-'3.51 41'_ . 2 ' 1 1 ' 'Runoff Area=0.710 ad I I i i I I I I I I I I Runoff Volume=0.126 of Ou;nOff'I Depth>2.'113" 0 1 ' 1 ' Tc=8.,O Min LL - I— -I- CN;:86 I I I 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) Keswick Hall_C.E.P. (PRE) Type // 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 19 Summary for Link 11L: Areas Combined ( Pre 1-2 + Pre 1-3) Inflow Area = 1.050 ac, 24.76% Impervious, Inflow Depth > 2.00" for 2-YR event Inflow = 3.45 cfs @ 11.99 hrs, Volume= 0.175 of Primary = 3.45 cfs @ 11.99 hrs, Volume= 0.175 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs N V 3 0 LL Link 11 L: Areas Combined ( Pre 1-2 + Pre 1-3) Hydrograph 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) ❑ Inflow ❑ Primary Keswick Hall_C.E.P. (PRE) Type // 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 20 Summary for Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Inflow Area = 1.540 ac, 28.57% Impervious, Inflow Depth > 2.07" for 2-YR event Inflow = 5.24 cfs @ 11.99 hrs, Volume= 0.266 of Primary = 5.24 cfs @ 11.99 hrs, Volume= 0.266 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs N V 3 0 LL Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Hydrograph 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) ❑ Inflow ❑ Primary Keswick Hall_C.E.P. (PRE) Type // 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 21 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 Subcatchment1S: Pre Area 1-2 (Onsite) Runoff Area=0.340 ac 2.94% Impervious Runoff Depth>3.29" Tc=7.0 min CN=81 Runoff=1.86 cfs 0.093 ai Subcatchment2S: Pre Area 3-1 (Onsite) Runoff Area=0.260 ac 30.77% Impervious Runoff Depth>3.77" Tc=30.0 min CN=86 Runoff=0.85 cfs 0.082 of Subcatchment10S: Pre Area 1-1 (Offsite) Runoff Area=0.490 ac 36.73% Impervious Runoff Depth>3.89" Tc=7.0 min CN=87 Runoff=3.07 cfs 0.159 ai Subcatchment12S: Pre Area 2-1 (Onsite) Runoff Area=0.970 ac 19.59% Impervious Runoff Depth>3.59" Tc=7.0 min CN=84 Runoff=5.71 cfs 0.290 of Subcatchment14S: Pre Area 1-3 (Onsite) Runoff Area=0.710 ac 35.21% Impervious Runoff Depth>3.79" Tc=8.0 min CN=86 Runoff=4.24 cfs 0.224 of Link 11 L: Areas Combined ( Pre 1-2 + Pre 1-3) Inflow=6.10 cfs 0.317 of Primary=6.10 cfs 0.317 of Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Inflow=9.17 cfs 0.476 of Primary=9.17 cfs 0.476 of Total Runoff Area = 2.770 ac Runoff Volume = 0.848 of Average Runoff Depth = 3.67" 74.37% Pervious = 2.060 ac 25.63% Impervious = 0.710 ac Keswick Hall_C.E.P. (PRE) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 22 Summary for Subcatchment 1 S: Pre Area 1-2 (Onsite) Runoff = 1.86 cfs @ 11.98 hrs, Volume= 0.093 af, Depth> 3.29" 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 0.010 98 Paved parking, HSG D 0.330 80 >75% Grass cover, Good, HSG D 0.340 81 Weighted Average 0.330 97.06% Pervious Area 0.010 2.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 1 S: Pre Area 1-2 (Onsite) Hydrograph 2 1 1 " 1 1 1 1 1 1.8s cfs I I I 1 1 1 Type Ili 24-hr 1 107Yr, Rainfall=5., 51; 1 1 Runbff Area=0.340 ad I I I I I I I I I I I I I I I 1 1 I I Runoff lVmlume=0.093 of 0 1 1 1 1 1 Tc:�7.10 Min LL I I I I I I I I I I I1 1 1 CN;:81 I I I I I I I I I 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) ❑ Runoff Keswick Hall_C.E.P. (PRE) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment 2S: Pre Area 3-1 (Onsite) Runoff = 0.85 cfs @ 12.24 hrs, Volume= 0.082 af, Depth> 3.77" 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 10-Yr Rainfall=5.35" Area (ac) CN Description 0.080 98 Paved parking, HSG D 0.180 80 >75% Grass cover, Good, HSG D 0.260 86 Weighted Average 0.180 69.23% Pervious Area 0.080 30.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.0 Direct Entry, Subcatchment 2S: Pre Area 3-1 (Onsite) Hydrograph I I I I I I I I I I I I 1 1 F I I I I I I I I I i l l I 1 l l ■Runoff 0.9 -1 -I- T -I- F- 7 -I- T -I- T 7 -I- T -I- F 7 -I- T -I- F -7 - 0.85 Typell 24-&r -I - T � 7 - - T -1 - 1- 7 - 1- T -1 - F -7- 0.8 0.75 1 T I n�f -1 1- Ci. T-- rt 1 F 1 1 1 1 T 1 F- V�I� r� ���1`� `�1 r I rt 1 -r 1 1 rt 1 -F 1 r-- 0.7 Rui�o��r�a�0l2s�'a�� 1-1-fi-1-1-rt-1-�-1-t-�- 0.65p—I— t —1,—,ter'f 0.6 f�Ca `�Ulu�e=®.082-a rn 0.55 1 1 t--1 -t I fi 1 I- I I t 1 �- 0.5 �fi{� e� 1" un"`i"-pp�"1 ��13.tZI- t � - c 0.45 T�®.V 1111n' - I- +- u. 0.4 I I + 1 --1-4 1 1 1 4 1 4- 1 -4 0.35 �-A A�pV-I-' Qp+c ^W 1 ++ 1+ 1 +� -4 1 1 1 4 -1- 4- 1 + 0.3 -4-1--1- -I-+-I-+-� -1-4--1-1-4-1-4--1- -4- 0.25 -4 I -I- I + I A A I � 1 1 4 1 4- 1 -4 0.2 -4 I -I- I + I A A I � 1 I -t 1 4- 1 -4 0.15 - I- -I - - I- -I - -1 L _I _ -1- 4- _1 _ L _ 0.1- n nr 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) Keswick Hall_C.E.P. (PRE) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 24 Summary for Subcatchment 10S: Pre Area 1-1 (Offsite) Runoff = 3.07 cfs @ 11.98 hrs, Volume= 0.159 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 0.180 98 Paved parking, HSG D 0.310 80 >75% Grass cover, Good, HSG D 0.490 87 Weighted Average 0.310 63.27% Pervious Area 0.180 36.73% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 10S: Pre Area 1-1 (Offsite) Hydrograph I I I I I 0 Runoff 3.07 cfs _ _ L - - 1 3 1 1 Type Ili 24-hr 107Yr1 Rainfall=5., 51; 'Runbff Area=0.490 ad RunoffliVolume=O M-a 2- Ou;nOff'1Depth>3.,09" 1 1 1 1 1 1 Tc=7.,O tnih U. I I I I I I I I I 1 1 1 CN;:87 1 I I I I I I I I 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) Keswick Hall_C.E.P. (PRE) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 25 Summary for Subcatchment 12S: Pre Area 2-1 (Onsite) Runoff = 5.71 cfs @ 11.98 hrs, Volume= 0.290 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 0.190 98 Paved parking, HSG D 0.780 80 >75% Grass cover, Good, HSG D 0.970 84 Weighted Average 0.780 80.41 % Pervious Area 0.190 19.59% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 12S: Pre Area 2-1 (Onsite) Hydrograph 6 s 71 cfs I 1Tyrpe Ili 24-hr 5 1 1 1 1 OTYr1 rainfall=5. 51 'Runbff Area=0.970 ad 4 1 1 1 1 1 1 1 1 1 Runoff 90 of w I I I I I I I I I 1 1 Ou'n 1 ff 1 D 1 h>3.159,' 0 3 1 Tc:ll Min LL I I I I I I I I I I I I I I I I I I I 1-4-1— 1 -4 — — —I —— -4 1 + 1 ^ 44 2 I I I I I I I I I I I I I I I I I I I I 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) ■ Runoff Keswick Hall_C.E.P. (PRE) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 26 Summary for Subcatchment 14S: Pre Area 1-3 (Onsite) Runoff = 4.24 cfs @ 11.99 hrs, Volume= 0.224 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 0.250 98 Paved parking, HSG D 0.460 80 >75% Grass cover, Good, HSG D 0.710 86 Weighted Average 0.460 64.79% Pervious Area 0.250 35.21 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 14S: Pre Area 1-3 (Onsite) Hydrograph ■ Runoff 4.24 cfs I Type fly 2 -hr 4 107Yr, Rainfall=5., 51; Runbff Area=0.710 ad 3 Runoff lVmlume=0.224 of w I Ou;nOff IlDepth>3.I'791' -� - - - + —I TC=8.0 iYTII'f `L 2 I I I CN;:86 -4 I - I --I 1 -4 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) Keswick Hall_C.E.P. (PRE) Type // 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 27 Summary for Link 11L: Areas Combined ( Pre 1-2 + Pre 1-3) Inflow Area = 1.050 ac, 24.76% Impervious, Inflow Depth > 3.63" for 10-Yr event Inflow = 6.10 cfs @ 11.99 hrs, Volume= 0.317 of Primary = 6.10 cfs @ 11.99 hrs, Volume= 0.317 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs N V 3 0 LL Link 11 L: Areas Combined ( Pre 1-2 + Pre 1-3) Hydrograph 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) ❑ Inflow ❑ Primary Keswick Hall_C.E.P. (PRE) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 28 Summary for Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Inflow Area = 1.540 ac, 28.57% Impervious, Inflow Depth > 3.71" for 10-Yr event Inflow = 9.17 cfs @ 11.99 hrs, Volume= 0.476 of Primary = 9.17 cfs @ 11.99 hrs, Volume= 0.476 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs f Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Hydrograph 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) ■ Inflow ❑ Primary Keswick Hall_C.E.P. (PRE) Type // 24-hr 100-YrRainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 29 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 Subcatchment1S: Pre Area 1-2 (Onsite) Runoff Area=0.340 ac 2.94% Impervious Runoff Depth>6.49" Tc=7.0 min CN=81 Runoff=3.54 cfs 0.184 ai Subcatchment2S: Pre Area 3-1 (Onsite) Runoff Area=0.260 ac 30.77% Impervious Runoff Depth>7.07" Tc=30.0 min CN=86 Runoff=1.55 cfs 0.153 of Subcatchment10S: Pre Area 1-1 (Offsite) Runoff Area=0.490 ac 36.73% Impervious Runoff Depth>7.22" Tc=7.0 min CN=87 Runoff=5.48 cfs 0.295 al Subcatchment12S: Pre Area 2-1 (Onsite) Runoff Area=0.970 ac 19.59% Impervious Runoff Depth>6.86" Tc=7.0 min CN=84 Runoff=10.51 cfs 0.554 of Subcatchment14S: Pre Area 1-3 (Onsite) Runoff Area=0.710 ac 35.21% Impervious Runoff Depth>7.10" Tc=8.0 min CN=86 Runoff=7.65 cfs 0.420 of Link 11 L: Areas Combined ( Pre 1-2 + Pre 1-3) Inflow=11.18 cfs 0.604 of Primary=11.18 cfs 0.604 of Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Inflow=16.65 cfs 0.899 of Primary=16.65 cfs 0.899 of Total Runoff Area = 2.770 ac Runoff Volume = 1.606 of Average Runoff Depth = 6.96" 74.37% Pervious = 2.060 ac 25.63% Impervious = 0.710 ac Keswick Hall_C.E.P. (PRE) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 30 Summary for Subcatchment 1 S: Pre Area 1-2 (Onsite) Runoff = 3.54 cfs @ 11.98 hrs, Volume= 0.184 af, Depth> 6.49" 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 100-Yr Rainfall=8.80" Area (ac) CN Description 0.010 98 Paved parking, HSG D 0.330 80 >75% Grass cover, Good, HSG D 0.340 81 Weighted Average 0.330 97.06% Pervious Area 0.010 2.94% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, 3 w I 2 LL 1 Subcatchment 1 S: Pre Area 1-2 (Onsite) Hydrograph I I I I I I I ❑Runoff I I I I I I I I I Type Ili 24-hr 1007Yrl Rlainfalt--.18.-001' 'Runbff Area=0.340 ad I I I I I I I Runoff Volume=0.184 of *'In4ff'IDepth6-419' Tc=7.,0 Min CN;=81 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) Keswick Hall_C.E.P. (PRE) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions Li Page 31 Summary for Subcatchment 2S: Pre Area 3-1 (Onsite) Runoff = 1.55 cfs @ 12.23 1 Volume= 0.153 af, Depth> 7.07" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Si 0.00-24.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Yr Rainfall=8.80" Area (ac) CN Description 0.080 98 Paved parking, HSG D 0.180 80 >75% Grass cover, Good, HSG D 0.260 86 Weighted Average 0.180 69.23% Pervious Area 0.080 30.77% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.0 Direct Entry, Subcatchment 2S: Pre Area 3-1 (Onsite) Hydrograph I I I I I I I I 1.55 cf. Type ill 24-hr I I I I I 100-)6 Rainfalls=41.80" Runoff Area=0 260 ad Runoff Volume=0.153�af I1ff Depth>17•07'U. � Tc=iii:30.0 min I I I I I I I I I CN=86 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 Keswick Hall_C.E.P. (PRE) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 32 Summary for Subcatchment 10S: Pre Area 1-1 (Offsite) Runoff = 5.48 cfs @ 11.98 hrs, Volume= 0.295 af, Depth> 7.22" 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 100-Yr Rainfall=8.80" Area (ac) CN Description 0.180 98 Paved parking, HSG D 0.310 80 >75% Grass cover, Good, HSG D 0.490 87 Weighted Average 0.310 63.27% Pervious Area 0.180 36.73% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, N 3 0 LL 0 Subcatchment 10S: Pre Area 1-1 (Offsite) Hydrograph I L I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I s I I I I I I — — I I I I I I I I I I I I I I I I rt I rt I I I I I I I I I I I I I I I I I fi I I I I I I I I I I I I I I I I I I I I I rt I I I I I I l l l l l i I I I as ors I I I I I I I I I I I i I i -Type 11124i1C 10O7'Yr1 Rlainfa11=8.006' I'RunoffAeea=0.490 a6 I I I I I I I I Runoff lVmlume=0.295 of -u;ngff'IBeptl I I I I I Tc=7.10 M i n I I I I I I I I �/�� I_ I I rrtrtI-�� V�8T I I I I I 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) ■ Runoff Keswick Hall_C.E.P. (PRE) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 33 Summary for Subcatchment 12S: Pre Area 2-1 (Onsite) Runoff = 10.51 cfs @ 11.98 hrs, Volume= 0.554 af, Depth> 6.86" 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 100-Yr Rainfall=8.80" Area (ac) CN Description 0.190 98 Paved parking, HSG D 0.780 80 >75% Grass cover, Good, HSG D 0.970 84 Weighted Average 0.780 80.41 % Pervious Area 0.190 19.59% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, It f N 3 0 LL 1 Subcatchment 12S: Pre Area 2-1 (Onsite) Hydrograph L I I I I I I I I I I I L _I_ I I I L —1 _ L J _ I_ L _I I I I I I I I I I I I I I I I I _ I— L —I— L _ I I I I I I I I I I I I I l l l l l i I I I 1 1Type11241ir -; - Ito04W,, R1lainfa117 00�' -'Rundff Aheti=Q-.9-70 -at I I I I I I I I I I I �Ru n-off-Vorunre=0.654 of L *L noff 11Dgpth�,JG06w 1 r 1 Tc:1:7 .0 -'r-fl h I 11 11 I I I I I I N- LLUI 1--1_L-_I—L—I—L-1_L I I I I I I 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) ■ Runoff Keswick Hall_C.E.P. (PRE) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 34 Summary for Subcatchment 14S: Pre Area 1-3 (Onsite) Runoff = 7.65 cfs @ 11.99 hrs, Volume= 0.420 af, Depth> 7.10" 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 100-Yr Rainfall=8.80" Area (ac) CN Description 0.250 98 Paved parking, HSG D 0.460 80 >75% Grass cover, Good, HSG D 0.710 86 Weighted Average 0.460 64.79% Pervious Area 0.250 35.21 % Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 14S: Pre Area 1-3 (Onsite) Hydrograph I I I I I I I I —I— —I— I 1 — —1— 4- —1 — k- -4 —1— —1— i — 1— -4 —I- 8 7.65 cfs 1 Al 7 I 1 ;10O7'Yr1 Rllainfa11=8.00'' ----------------- - - ---- ---- 6 1 1 1 1 1 1 1 1Runbff Ares=0.7�10 ad I I I I I I I I I I I I I I I I I I I I I I I 1 rt I fi I rt I -r I Runoff iVolume=0.42-0—af w 5 1 1 1 1 1 1 Aun 1ff 1D h>7110�' I_�_I_p _1_0_1_ 0 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Tc4.10 Min LL 1 1 1 3 Vr1Y;:86 I I I I I I I I I I I I I 2 I I I 1 I 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 Keswick Hall_C.E.P. (PRE) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 35 Summary for Link 11L: Areas Combined ( Pre 1-2 + Pre 1-3) Inflow Area = 1.050 ac, 24.76% Impervious, Inflow Depth > 6.90" for 100-Yr event Inflow = 11.18 cfs @ 11.99 hrs, Volume= 0.604 of Primary = 11.18 cfs @ 11.99 hrs, Volume= 0.604 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs f f f Link 11 L: Areas Combined ( Pre 1-2 + Pre 1-3) Hydrograph 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) ■ Inflow ❑ Primary Keswick Hall_C.E.P. (PRE) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 36 Summary for Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Inflow Area = 1.540 ac, 28.57% Impervious, Inflow Depth > 7.00" for 100-Yr event Inflow = 16.65 cfs @ 11.98 hrs, Volume= 0.899 of Primary = 16.65 cfs @ 11.98 hrs, Volume= 0.899 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 15L: Total Areas Combined (Pre 1-1 + Pre 1-2 + Pre 1-3) Hydrograph i I_ ■Inflow 18 _I 16.65 cfs I_ _ ❑ Primary _ _ _ 6.65 cis I I I I I I I I I InfIo-W- TA sa=-'Cl540-ac- � 16 i 15 14 i 13 12 11 10 i 0 9 _I_ _I _ I_ _I_ _I LL 8 i 7 6 5 4 i 3 2 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) 3S 67SP Post Area 1-4 (Offsite, Post Area 1-5 (Onsite, Detained) Bioretentio #1 Detained) 8S 9L Post Area 1-6 (Onsite, Undetained) 12S Post Area 2-2 (Onsite, Undetained) (4S Post Area 3-2 (Onsite, Undetained) Subcat Reach on Link Areas Combined (Bioretention + Post 1-6) Keswick Hall_C.E.P. (POST) Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 2.220 80 >75% Grass cover, Good, HSG D (3S, 4S, 7S, 8S, 12S) 0.040 77 Bioretention (3S) 0.330 98 Paved parking, HSG C (3S, 8S) 0.180 98 Paved parking, HSG D (7S) 2.770 83 TOTAL AREA Keswick Hall_C.E.P. (POST) Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 0.330 HSG C 3S, 8S 2.400 HSG D 3S, 4S, 7S, 8S, 12S 0.040 Other 3S 2.770 TOTAL AREA Keswick Hall C.E.P. (POST) Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 0.000 2.220 0.000 2.220 >75% Grass cover, Good 3S, 4S, 7S, 8S, 12S 0.000 0.000 0.000 0.000 0.040 0.040 Bioretention 3S 0.000 0.000 0.330 0.180 0.000 0.510 Paved parking 3S, 7S, 8S 0.000 0.000 0.330 2.400 0.040 2.770 TOTAL AREA Keswick Hall C.E.P. (POST) Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 5 Pipe Listing (all nodes) Line# Node In -Invert Out -Invert Length Slope n Diam/Width Height Inside -Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 6P 431.00 430.41 29.4 0.0201 0.013 15.0 0.0 0.0 Keswick Hall_C.E.P. (POST) Type 1124-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 6 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 Subcatchment3S: Post Area 1-5 (Onsite, Runoff Area=0.340 ac 35.29% Impervious Runoff Depth>1.59" Tc=6.0 min CN=86 Runoff=0.93 cfs 0.045 of Subcatchment4S: Post Area 3-2 (Onsite, Runoff Area=0.280 ac 0.00% Impervious Runoff Depth>1.18" Tc=30.0 min CN=80 Runoff=0.28 cfs 0.028 of Subcatchment7S: Post Area 1-4 (Offsite, Runoff Area=0.490 ac 36.73% Impervious Runoff Depth>1.67" Tc=7.0 min CN=87 Runoff=1.37 cfs 0.068 ai Subcatchment8S: Post Area 1-6 (Onsite, Runoff Area=0.690 ac 30.43% Impervious Runoff Depth>1.52" Tc=8.0 min CN=85 Runoff=1.72 cfs 0.087 of Subcatchment12S: Post Area 2-2 (Onsite, Runoff Area=0.970 ac 0.00% Impervious Runoff Depth>1.19" Tc=7.0 min CN=80 Runoff=1.96 cfs 0.096 of Pond 6P: Bioretention#1 Peak Elev=437.58' Storage=3,979 cf Inflow=2.30 cfs 0.113 of Outflow=0.04 cfs 0.023 of Link 9L: Areas Combined (Bioretention+ Post 1-6) Inflow=1.72 cfs 0.110 of Primary=1.72 cfs 0.110 of Total Runoff Area = 2.770 ac Runoff Volume = 0.324 of Average Runoff Depth = 1.40" 81.59% Pervious = 2.260 ac 18.41 % Impervious = 0.510 ac Keswick Hall_C.E.P. (POST) Type // 24-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 3S: Post Area 1-5 (Onsite, Detained) Runoff = 0.93 cfs @ 11.97 hrs, Volume= 0.045 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 0.120 98 Paved parking, HSG C 0.180 80 >75% Grass cover, Good, HSG D 0.040 77 Bioretention 0.340 86 Weighted Average 0.220 64.71 % Pervious Area 0.120 35.29% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: Post Area 1-5 (Onsite, Detained) Hydrograph I I I I I I I I I I I 0.93 cfs Type Ili 24-hr 117Yr1 RainfallT2.021 1Run6ff Area=0.340 arc I I I I I I I I Runoff lVmlume=0.045 of N tu;nOff',Depth>1.159�' 1 1 1 1 1 1 1 1 1 Tc=6.10 mill LL CN;:86 I I I I I I I I I I I I I I Time (hours) ❑ Runoff Keswick Hall_C.E.P. (POST) Type // 24-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 4S: Post Area 3-2 (Onsite, Undetained) Runoff = 0.28 cfs @ 12.26 hrs, Volume= 0.028 af, Depth> 1.18" 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 0.280 80 >75% Grass cover, Good, HSG D 0.280 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.0 Direct Entry, Subcatchment 4S: Post Area 3-2 (Onsite, Undetained) Hydrograph I I I I I I I I I I I I I I I I I I I I I 0.3 1 1 T I 1 T I T I ■Runoff Os28 rt —1— rt- 0.28 Tiy�Ie]1-24+�h�r-1- -1-�� k-1-4--1-1--4-I-4--1-��- 0.26 1 0.24 II-IIr a�n1IQ111 LL'1- -I -i- 1 -I1 - I- 1 -I1- -1 - 0.22 1 Ruho'ff Ard&01.280'ad I I I I I I I —I— T —I— T T —I— T —I— T 1 1 1 1 1 1- 0.2 Runoff4V -Volume=0.028-af - 0.16 U. 0.14 C:30.01 rrfln' T 1 T T 0.12 CN;=80-1 - -4 0.08 0.06 1 1 1 1 1 1 1 1 1 1 1 1 1 -T T 1 0.04 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) Keswick Hall_C.E.P. (POST) Type // 24-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 7S: Post Area 1-4 (Offsite, Detained) Runoff = 1.37 cfs @ 11.98 hrs, Volume= 0.068 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 0.180 98 Paved parking, HSG D 0.310 80 >75% Grass cover, Good, HSG D 0.490 87 Weighted Average 0.310 63.27% Pervious Area 0.180 36.73% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: Post Area 1-4 (Offsite, Detained) Hydrograph 1$7 cfs Type Ili 24-hr 1,Yr1 Painfall=2.02'' 'Runoff Aeea=0.490 a6 11 1 1 1 1 I I I I I I I I Runoff lVmlume=0.068 of I Ou;nOff',Depth>1.1,671' 1 1 1 1 1 Tc=7.,O Min LL CN;:817 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 Keswick Hall_C.E.P. (POST) Type // 24-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Runoff = 1.72 cfs @ 11.99 hrs, Volume= 0.087 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 0.210 98 Paved parking, HSG C 0.480 80 >75% Grass cover, Good, HSG D 0.690 85 Weighted Average 0.480 69.57% Pervious Area 0.210 30.43% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, N 1 3 0 LL Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Hydrograph -4 — 1— 4 — I — 4- —1 — 1— -4 — I— + —1 I I I I I I I I I I I I I I I I I I I I I I I I I I I Type Ili 24-hr 1,Yr1 P.,ainfall=2.026' 'Runbff Area=0.690 ad I I I I I I I I Runoff lVmlume=0.087 of -Ru;nc-ff',Depth>1.$21'y Tc=8.,0 Min I I I I I I I I I CN;=8b I I I I I I 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) ❑ Runoff Keswick Hall_C.E.P. (POST) Type // 24-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 11 Summary for Subcatchment 12S: Post Area 2-2 (Onsite, Undetained) Runoff = 1.96 cfs @ 11.99 hrs, Volume= 0.096 af, Depth> 1.19" 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 0.970 80 >75% Grass cover, Good, HSG D 0.970 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 12S: Post Area 2-2 (Onsite, Undetained) Hydrograph I I ❑Runoff I I I I I I (Type Ili 24-hr 117Yrl Rainfall 2.021 IRunbff Awea=0.970 ad RunoffllVolume=0.096 of Ou;noff'IDgpth>1.'11916' ————I Tc:1:7.10Min CN:;=80 I I I I I I 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) Keswick Hall_C.E.P. (POST) Type 1124-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 12 Summary for Pond 6P: Bioretention #1 Inflow Area = 0.830 ac, 36.14% Impervious, Inflow Depth > 1.64" for 1-Yr event Inflow = 2.30 cfs @ 11.98 hrs, Volume= 0.113 of Outflow = 0.04 cfs @ 17.19 hrs, Volume= 0.023 af, Atten= 98%, Lag= 312.9 min Primary = 0.04 cfs @ 17.19 hrs, Volume= 0.023 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 437.58' @ 17.19 hrs Surf.Area= 2,092 sf Storage= 3,979 cf Plug -Flow detention time= 477.5 min calculated for 0.023 of (20% of inflow) Center -of -Mass det. time= 339.0 min ( 1,159.9 - 820.9 ) Volume Invert Avail.Storage Storage Description #1 432.00' 7,637 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 3,066 100.0 4,759 7,637 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 T Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 437.50' 18.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=0.04 cfs @ 17.19 hrs HW=437.58' (Free Discharge) L1=Culvert (Passes 0.04 cfs of 11.39 cfs potential flow) L2=Orifice/Grate (Orifice Controls 0.04 cfs @ 0.97 fps) Keswick Hall_C.E.P. (POST) Type // 24-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 13 Pond 6P: Bioretention #1 Hydrograph I I I I I I I I I I I I I I I I I I I I 2.30 ds I Inflow (Area=0.830 IaC r 2 levy Peak 43�1.�8' I- ttorage - 3,9�91 Cf I I I I I I I I I I I I I I i l l I I I I I I I I I I I I I I N I I I I I I I I I I I I C- 1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 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) ■ Inflow ❑ Primary Keswick Hall_C.E.P. (POST) Type 1124-hr 1-Yr Rainfall=2.92" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 14 Summary for Link 9L: Areas Combined (Bioretention + Post 1-6) Inflow Area = 1.520 ac, 33.55% Impervious, Inflow Depth > 0.87" for 1-Yr event Inflow = 1.72 cfs @ 11.99 hrs, Volume= 0.110 of Primary = 1.72 cfs @ 11.99 hrs, Volume= 0.110 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Link 9L: Areas Combined (Bioretention + Post 1-6) Hydrograph ❑ Inflow ❑ Primary 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) Keswick Hall_C.E.P. (POST) Type // 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 15 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 Subcatchment3S: Post Area 1-5 (Onsite, Runoff Area=0.340 ac 35.29% Impervious Runoff Depth>2.13" Tc=6.0 min CN=86 Runoff=1.23 cfs 0.060 ai Subcatchment4S: Post Area 3-2 (Onsite, Runoff Area=0.280 ac 0.00% Impervious Runoff Depth>1.65" Tc=30.0 min CN=80 Runoff=0.40 cfs 0.039 of Subcatchment7S: Post Area 1-4 (Offsite, Runoff Area=0.490 ac 36.73% Impervious Runoff Depth>2.22" Tc=7.0 min CN=87 Runoff=1.80 cfs 0.090 al Subcatchment8S: Post Area 1-6 (Onsite, Runoff Area=0.690 ac 30.43% Impervious Runoff Depth>2.05" Tc=8.0 min CN=85 Runoff=2.30 cfs 0.118 of Subcatchment12S: Post Area 2-2 (Onsite, Runoff Area=0.970 ac 0.00% Impervious Runoff Depth>1.67" Tc=7.0 min CN=80 Runoff=2.74 cfs 0.135 al Pond 6P: Bioretention#1 Peak Elev=437.67' Storage=4,165 cf Inflow=3.03 cfs 0.151 of Outflow=0.15 cfs 0.060 of Link 9L: Areas Combined (Bioretention+ Post 1-6) Inflow=2.30 cfs 0.178 of Primary=2.30 cfs 0.178 of Total Runoff Area = 2.770 ac Runoff Volume = 0.442 of Average Runoff Depth = 1.91" 81.59% Pervious = 2.260 ac 18.41 % Impervious = 0.510 ac Keswick Hall_C.E.P. (POST) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment 3S: Post Area 1-5 (Onsite, Detained) Runoff = 1.23 cfs @ 11.97 hrs, Volume= 0.060 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 0.120 98 Paved parking, HSG C 0.180 80 >75% Grass cover, Good, HSG D 0.040 77 Bioretention 0.340 86 Weighted Average 0.220 64.71 % Pervious Area 0.120 35.29% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: Post Area 1-5 (Onsite, Detained) 1 -k- 1 1 -4 1 II I I i i I I a I 1 1 I 1 LL 1111 1111 Hydrograph Time (hours) I I I I I I I I I Type Ili 24-hr 61 Rainfjpll 311 4, Runbff Area=0.340 arc I I I I I I I Runoff lVmlume=0.060 of Ou;nOff 11Depth>2.11131' 1 1 1 1 Tc=6.10 Min CN;:86 I I I I I I I I I I I I I I I I 11 11 11 11 I 11 11 ❑ Runoff Keswick Hall_C.E.P. (POST) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 17 Summary for Subcatchment 4S: Post Area 3-2 (Onsite, Undetained) Runoff = 0.40 cfs @ 12.25 hrs, Volume= 0.039 af, Depth> 1.65" 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 2-YR Rainfall=3.54" Area (ac) CN Description 0.280 80 >75% Grass cover, Good, HSG D 0.280 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.0 Direct Entry, Subcatchment 4S: Post Area 3-2 (Onsite, Undetained) Hydrograph --1—T-1—--1—+-1——1-4-1-4--1-1—-4-1-4- 0.44 — I— + —I — — I— + —I — t — I— -t —I — t —1 — 1— - — I— t —I — i ❑Runoff 0.42 —1— t —1— r —1— -r —1— fi 0.40ds rt — I — fi —1— 1— -t —I— -- 0.4 TY"- 11-24�h�r_I—T—I—T Z1'p�' T — I —T 1 7—I—T-1—LT 0.38 0.36-F�ilrnfa�l=4'---J 1 --------------- 0.34 - 1 - - 1 - L L _I - L _I - I- -1 _ I- L _I _ L 1 _ 0.32 fahoff Ard&-01.-2$o-lad- -1 l -I- L -1 _ 1- -A -I- 1 -1- L - _ 0.3 4-.I�-w11 --' I I-I-+/-IIq-A+---] 4 - I - -1-1-4-1-4--1-�� 0.28 Ru1NVolum�®.039-a7 0.26 1CT{�-�]p1�{�1.-1 C�.-T-1 T-I-r-1-1-7-I-T-1-LT 3 0.22 02 ------Y�11--- I 1 -1 _1_ _1_ _1 --------------- _1_ _I_1_ _1_ _1_ 1 1 . U. 0.18 — L J — I— 1 _I _ L J 1 — I — L —1 — I— -L — I— L —1 — L L _ 0.16 /-+1w—�'I—pp1���-1 CNF—=80-1 — — I— T —1— 4 —I — 4- —1 — 1— -4 — I— 4- —1 — - - 0.14+ + +I�� 0.12 0.1 T 1 T T 1 1 T 1 1 T 1 T 0.08 - - - - - - - - - - - - - - - - - - - - - - - - - 0.06 nnn I 1 1 I I I I I I I I I I I 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) Keswick Hall_C.E.P. (POST) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment 7S: Post Area 1-4 (Offsite, Detained) Runoff = 1.80 cfs @ 11.98 hrs, Volume= 0.090 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 0.180 98 Paved parking, HSG D 0.310 80 >75% Grass cover, Good, HSG D 0.490 87 Weighted Average 0.310 63.27% Pervious Area 0.180 36.73% Impervious Area Tc Length min) (feet) 7.0 2 Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) Direct Entry, Subcatchment 7S: Post Area 1-4 (Offsite, Detained) Hydrograph t —I I I I I I I I I 1.80 cfs 1 1 Type Ili 24-hr -YR, Rainfall=3.51 41' 'Runbff Area=0.490 ad I I I I I I I I Runoff lVmlume=0.090 of -0-u ngff 11 Depth*11 2-,'2216' 1 1 ' 1 Tc=7.10 Min I I I I I I I I I CN;:87 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 Keswick Hall_C.E.P. (POST) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 19 Summary for Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Runoff = 2.30 cfs @ 11.99 hrs, Volume= 0.118 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 0.210 98 Paved parking, HSG C 0.480 80 >75% Grass cover, Good, HSG D 0.690 85 Weighted Average 0.480 69.57% Pervious Area 0.210 30.43% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Hydrograph I I I I I 2.30 cfs Type Ili 24-hr 2 RainfalT��41' 'Runbff Area=0.690 ad i I I I I I I I I Runoff lVmlume=0.118 of Ou;nOff IlDepth>2.05" LL _ _ �c=8.0 fniit l l CN;:85 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 Keswick Hall_C.E.P. (POST) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 20 Summary for Subcatchment 12S: Post Area 2-2 (Onsite, Undetained) Runoff = 2.74 cfs @ 11.99 hrs, Volume= 0.135 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 2-YR Rainfall=3.54" Area (ac) CN Description 0.970 80 >75% Grass cover, Good, HSG D 0.970 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 12S: Post Area 2-2 (Onsite, Undetained) Hydrograph 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2.74 cfs I I I I I 1 IType Ili 24-hr -` g R1lainfall 13 41' Runoff-Awea=0:9-70 ad 2 RunollVolume=0.135 o Runoff f N Ou;noff'1Depth>1.,071' U u_ 1 1 Tc=7.10 Min P+w S0 1 I I I I I I I I I I I I I I I I I I I 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) ❑ Runoff Keswick Hall_C.E.P. (POST) Type/1 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 21 Summary for Pond 6P: Bioretention #1 Inflow Area = 0.830 ac, 36.14% Impervious, Inflow Depth > 2.18" for 2-YR event Inflow = 3.03 cfs @ 11.98 hrs, Volume= 0.151 of Outflow = 0.15 cfs @ 13.11 hrs, Volume= 0.060 af, Atten= 95%, Lag= 68.0 min Primary = 0.15 cfs @ 13.11 hrs, Volume= 0.060 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 437.67' @ 13.11 hrs Surf.Area= 2,152 sf Storage= 4,165 cf Plug -Flow detention time= 301.8 min calculated for 0.060 of (40% of inflow) Center -of -Mass det. time= 182.4 min ( 995.2 - 812.8 ) Volume Invert Avail.Storage Storage Description #1 432.00' 7,637 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 3,066 100.0 4,759 7,637 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 T Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 437.50' 18.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=0.15 cfs @ 13.11 hrs HW=437.67' (Free Discharge) L1=Culvert (Passes 0.15 cfs of 11.47 cfs potential flow) L2=Orifice/Grate (Orifice Controls 0.15 cfs @ 1.40 fps) Keswick Hall_C.E.P. (POST) Type 11 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 22 Pond 6P: Bioretention #1 Hydrograph I I I I I I I I I I I I I I I I —I— 1— 1 — I— t —I — - —I-A-3. 3 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 2 N I I I I I I I I I I I c LL I— t —1 1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I ——t-1—�- -� —I — I Inflow (Area=0.8301aC Peak bev=431� ki titoMgeT41,1651 Cf I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 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) ■ Inflow ❑ Primary Keswick Hall_C.E.P. (POST) Type // 24-hr 2-YR Rainfall=3.54" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 23 Summary for Link 9L: Areas Combined (Bioretention + Post 1-6) Inflow Area = 1.520 ac, 33.55% Impervious, Inflow Depth > 1.41" for 2-YR event Inflow = 2.30 cfs @ 11.99 hrs, Volume= 0.178 of Primary = 2.30 cfs @ 11.99 hrs, Volume= 0.178 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs N V 3 0 LL Link 9L: Areas Combined (Bioretention + Post 1-6) Hydrograph 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) ❑ Inflow ❑ Primary Keswick Hall_C.E.P. (POST) Type // 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 24 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 Subcatchment3S: Post Area 1-5 (Onsite, Runoff Area=0.340 ac 35.29% Impervious Runoff Depth>3.79" Tc=6.0 min CN=86 Runoff=2.13 cfs 0.107 ai Subcatchment4S: Post Area 3-2 (Onsite, Runoff Area=0.280 ac 0.00% Impervious Runoff Depth>3.18" Tc=30.0 min CN=80 Runoff=0.78 cfs 0.074 of Subcatchment7S: Post Area 1-4 (Offsite, Runoff Area=0.490 ac 36.73% Impervious Runoff Depth>3.89" Tc=7.0 min CN=87 Runoff=3.07 cfs 0.159 ai Subcatchment8S: Post Area 1-6 (Onsite, Runoff Area=0.690 ac 30.43% Impervious Runoff Depth>3.69" Tc=8.0 min CN=85 Runoff=4.04 cfs 0.212 of Subcatchment12S: Post Area 2-2 (Onsite, Runoff Area=0.970 ac 0.00% Impervious Runoff Depth>3.20" Tc=7.0 min CN=80 Runoff=5.18 cfs 0.258 ai Pond 6P: Bioretention#1 Peak Elev=438.23' Storage=5,470 cf Inflow=5.15 cfs 0.266 of Outflow=2.46 cfs 0.175 of Link 9L: Areas Combined (Bioretention+ Post 1-6) Inflow=5.67 cfs 0.387 of Primary=5.67 cfs 0.387 of Total Runoff Area = 2.770 ac Runoff Volume = 0.811 of Average Runoff Depth = 3.51" 81.59% Pervious = 2.260 ac 18.41 % Impervious = 0.510 ac Keswick Hall_C.E.P. (POST) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 25 Summary for Subcatchment 3S: Post Area 1-5 (Onsite, Detained) Runoff = 2.13 cfs @ 11.97 hrs, Volume= 0.107 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 0.120 98 Paved parking, HSG C 0.180 80 >75% Grass cover, Good, HSG D 0.040 77 Bioretention 0.340 86 Weighted Average 0.220 64.71 % Pervious Area 0.120 35.29% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: Post Area 1-5 (Onsite, Detained) Hydrograph I I I I I I I I I I I I I I I I I I I I I I 1 -f I t -IType Ai 24-hr 1O7Yr1 Rainfall=5., 51' IRunbff Area=0.340 arc I I I I I I Runoff lVmlume=0.107 of OuInOff'IDepth>3.' 9'' I I Tc=6.10 hAh 1 1 CN�8i6 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 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) ■ Runoff Keswick Hall_C.E.P. (POST) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 26 Summary for Subcatchment 4S: Post Area 3-2 (Onsite, Undetained) Runoff = 0.78 cfs @ 12.24 hrs, Volume= 0.074 af, Depth> 3.18" 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 0.280 80 >75% Grass cover, Good, HSG D 0.280 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.0 Direct Entry, Subcatchment 4S: Post Area 3-2 (Onsite, Undetained) Hydrograph -A I T I L L 1 T 1 L-1 I L I L 1 I L 1 L L 0.85 II ■Runoff 0.8 1o.�s ors 0.75 1 Ty�ell 24;h-r - -I- -I- -I- -I-I 0.7 p1 ,,I �, 1 1 1 I� i1tIC I1�5 -�S -1- -1 - - -1 - 0.65 1 tlt-Itr 1- Ru- �o�Arda�0!-289Ia-d o.s rt I 1 T rt 1 1 rt 1 fi 1� rt 0.55 .1,.wt�r`1,-ter' n1��1fi,�-s Runoff Votu - e=®.074-ai 4 I 1 4 I 4- I -4 0.5 4f- p� irk -4 11 4 I 4- I L-4 �►uQ�LTT`1C'�I�• �I- 0.45 _0 0.4 �i�3A.01 �� L 0.35 1 11 1 11�_1_ 1 1 _ _I_ _I_ _ C Ind F 80 1 1 I I I I I 11 1 1 1 1 0.3 0.25 1 1 1 1 F I T I 1 I I I I 1 F T I 1 T 1 T T 1 T I T-1 f I L 1 1 T 1 L T 0.2 I I T Ir— I I T I T——1I r 1- — 11 r� 0.15 -f - I- + -I - - I- + - 1- -1 - i - 0.1 A --1-�--1+ I I I 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) Keswick Hall_C.E.P. (POST) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 27 Summary for Subcatchment 7S: Post Area 1-4 (Offsite, Detained) Runoff = 3.07 cfs @ 11.98 hrs, Volume= 0.159 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 0.180 98 Paved parking, HSG D 0.310 80 >75% Grass cover, Good, HSG D 0.490 87 Weighted Average 0.310 63.27% Pervious Area 0.180 36.73% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 7S: Post Area 1-4 (Offsite, Detained) Hydrograph I I I I I 0 Runoff 3.07 cfs _ _ L - - 1 3 1 1 Type Ili 24-hr 107Yr1 Rainfall=5., 51; 'Runbff Area=0.490 ad RunoffliVolume=O M-a 2- Ou;nOff'1Depth>3.,09" 1 1 1 1 1 1 Tc=7.,O tnih U. I I I I I I I I I 1 1 1 CN;:87 1 I I I I I I I I 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) Keswick Hall_C.E.P. (POST) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 28 Summary for Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Runoff = 4.04 cfs @ 11.99 hrs, Volume= 0.212 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 0.210 98 Paved parking, HSG C 0.480 80 >75% Grass cover, Good, HSG D 0.690 85 Weighted Average 0.480 69.57% Pervious Area 0.210 30.43% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Hydrograph I I I I I e Runoff 4.04 cfs - — — — — 4 1 1 1 Type Ili 24-hr 10,Yr1 Rainfall=5., 51; 1RunoffArea=O$90 arc 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 I I Runoff lVmlume=0.212 of 1 Ouln4ff11Dgp�h>3.11091" .2 2 1 — 1— -1- -1- -1-Tc 8.10 Ih'lii� I I I I I I I I I I I I I I I I I CN;:85 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) Keswick Hall_C.E.P. (POST) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 29 Summary for Subcatchment 12S: Post Area 2-2 (Onsite, Undetained) Runoff = 5.18 cfs @ 11.98 hrs, Volume= 0.258 af, Depth> 3.20" 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 0.970 80 >75% Grass cover, Good, HSG D 0.970 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, 0 Subcatchment 12S: Post Area 2-2 (Onsite, Undetained) Hydrograph I I I I I I I I ■Runoff I I I I TY'pe 111-24 h r 107Yr1 Rllai 1nf01175.�511' Runoff Atea -0 970 aic Runoff llVolume=0.258 of -u;nOff Depth-3-.�-01`u Tc=7.10 Min I I I I 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) Keswick Hall_C.E.P. (POST) Type // 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 30 Summary for Pond 6P: Bioretention #1 Inflow Area = 0.830 ac, 36.14% Impervious, Inflow Depth > 3.85" for 10-Yr event Inflow = 5.15 cfs @ 11.97 hrs, Volume= 0.266 of Outflow = 2.46 cfs @ 12.08 hrs, Volume= 0.175 af, Atten= 52%, Lag= 6.6 min Primary = 2.46 cfs @ 12.08 hrs, Volume= 0.175 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 438.23' @ 12.08 hrs Surf.Area= 2,535 sf Storage= 5,470 cf Plug -Flow detention time=179.6 min calculated for 0.174 of (65% of inflow) Center -of -Mass det. time= 80.1 min ( 876.8 - 796.7 ) Volume Invert Avail.Storage Storage Description #1 432.00' 7,637 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 3,066 100.0 4,759 7,637 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 T Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 437.50' 18.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=2.41 cfs @ 12.08 hrs HW=438.22' (Free Discharge) L1=Culvert (Passes 2.41 cfs of 11.98 cfs potential flow) L2=Orifice/Grate (Orifice Controls 2.41 cfs @ 2.89 fps) Keswick Hall_C.E.P. (POST) Type/1 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 31 Pond 6P: Bioretention #1 Hydrograph I I I I I I I I I I I I I I I I _I_ L L_ I_ 1 _1 _ L 1 _I_� I I I I I I I I I I 5 I I I I I I I I I I I I 4 I I I I I I I I I I I I I I I I I I I I I I I 3 / c z4sc LLA - I F I + 1 2 - 1 t- I + 1 - 1I I I I I I 1 I I I I I I I Inflow Area =0.83011aC Peak bev=4381 .23' ttorage - 5,4�01 Cf I I I l i I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I ( I I I I I I I I I I I I I I I I I - 1 -4 1 I I I I I 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) ■ Inflow ❑ Primary Keswick Hall_C.E.P. (POST) Type // 24-hr 10-Yr Rainfall=5.35" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 32 Summary for Link 9L: Areas Combined (Bioretention + Post 1-6) Inflow Area = 1.520 ac, 33.55% Impervious, Inflow Depth > 3.05" for 10-Yr event Inflow = 5.67 cfs @ 12.03 hrs, Volume= 0.387 of Primary = 5.67 cfs @ 12.03 hrs, Volume= 0.387 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs N V 3 0 LL Link 9L: Areas Combined (Bioretention + Post 1-6) Hydrograph 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) ❑ Inflow ❑ Primary Keswick Hall_C.E.P. (POST) Type // 24-hr 100-YrRainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 33 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 Subcatchment3S: Post Area 1-5 (Onsite, Runoff Area=0.340 ac 35.29% Impervious Runoff Depth>7.10" Tc=6.0 min CN=86 Runoff=3.85 cfs 0.201 of Subcatchment4S: Post Area 3-2 (Onsite, Runoff Area=0.280 ac 0.00% Impervious Runoff Depth>6.34" Tc=30.0 min CN=80 Runoff=1.53 cfs 0.148 of Subcatchment7S: Post Area 1-4 (Offsite, Runoff Area=0.490 ac 36.73% Impervious Runoff Depth>7.22" Tc=7.0 min CN=87 Runoff=5.48 cfs 0.295 al Subcatchment8S: Post Area 1-6 (Onsite, Runoff Area=0.690 ac 30.43% Impervious Runoff Depth>6.98" Tc=8.0 min CN=85 Runoff=7.36 cfs 0.401 of Subcatchment12S: Post Area 2-2 (Onsite, Runoff Area=0.970 ac 0.00% Impervious Runoff Depth>6.37" Tc=7.0 min CN=80 Runoff=9.97 cfs 0.515 of Pond 6P: Bioretention#1 Peak Elev=438.90' Storage=7,328 cf Inflow=9.23 cfs 0.496 of Outflow=6.90 cfs 0.403 of Link 9L: Areas Combined (Bioretention+ Post 1-6) Inflow=13.95 cfs 0.804 of Primary=13.95 cfs 0.804 of Total Runoff Area = 2.770 ac Runoff Volume = 1.560 of Average Runoff Depth = 6.76" 81.59% Pervious = 2.260 ac 18.41 % Impervious = 0.510 ac Keswick Hall_C.E.P. (POST) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 34 Summary for Subcatchment 3S: Post Area 1-5 (Onsite, Detained) Runoff = 3.85 cfs @ 11.96 hrs, Volume= 0.201 af, Depth> 7.10" 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 100-Yr Rainfall=8.80" Area (ac) CN Description 0.120 98 Paved parking, HSG C 0.180 80 >75% Grass cover, Good, HSG D 0.040 77 Bioretention 0.340 86 Weighted Average 0.220 64.71 % Pervious Area 0.120 35.29% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 3S: Post Area 1-5 (Onsite, Detained) Hydrograph —1 — I— -� — I — -� —I— �- 4 0 2 LL 1/1 1 I I I I I I I I I I I I I I I I I Type Ili 24-hr 61 10O7'Yr1 Rllainfall 18.001 Runoff Area=0.340 arc I I I I I I I Runoff lVmlume=0.201 of u;n4ff IIDqpth>7110,' . I Tc:1:6.10 Min 1 1 CN;:86 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 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) ❑ Runoff Keswick Hall_C.E.P. (POST) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 35 Summary for Subcatchment 4S: Post Area 3-2 (Onsite, Undetained) Runoff = 1.53 cfs @ 12.24 hrs, Volume= 0.148 af, Depth> 6.34" 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 100-Yr Rainfall=8.80" Area (ac) CN Description 0.280 80 >75% Grass cover, Good, HSG D 0.280 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 30.0 Direct Entry, Subcatchment 4S: Post Area 3-2 (Onsite, Undetained) Hydrograph I I I I I I I I I I I I I I I I I ' ❑Runoff I I I I I I I I t.53 cts I I I I I I I I I Type III 24-hn 1 1 1 1 1 1 1 1 1;0044r Rain fall111•�Y" Runoff Area=0 280 lac' I I I Runoff Volume=0.148raf u 1 N Ruooff Depth>116.�4'` 1 1 LL 1 Tc�30.0 m i n CN=80 1 1 I I I I I I Time (hours) Keswick Hall_C.E.P. (POST) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 36 Summary for Subcatchment 7S: Post Area 1-4 (Offsite, Detained) Runoff = 5.48 cfs @ 11.98 hrs, Volume= 0.295 af, Depth> 7.22" 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 100-Yr Rainfall=8.80" Area (ac) CN Description 0.180 98 Paved parking, HSG D 0.310 80 >75% Grass cover, Good, HSG D 0.490 87 Weighted Average 0.310 63.27% Pervious Area 0.180 36.73% Impervious Area Tc min 7.0 N 3 0 LL 0 Length Slope Velocity Capacity Description (feet) (ft/ft) (ft/sec) (cfs) Direct Entry, Subcatchment 7S: Post Area 1-4 (Offsite, Detained) Hydrograph I L I I I I I s I I I I I I I I I I I I I I I I I I I I I I rt I rt I I I I I I I I I I I I I I I I I fi I I I I I I I I I I I I I I I I I I I I I rt I I I I I I l l l l l i I I I as ors I I I I I I I I I I I i I i -Type 11124i1C 10O7'Yr1 Rlainfa11=8.006' I'RunoffAeea=0.490 a6 I I I I I I I I Runoff lVmlume=0.295 of -u;ngff'IDeptl I I I I I Tc=7.10 M i n I I I I I I I I �/�� I_ I I rrtrtI-�� V�8T I I I I I 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) ■ Runoff Keswick Hall_C.E.P. (POST) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 37 Summary for Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Runoff = 7.36 cfs @ 11.99 hrs, Volume= 0.401 af, Depth> 6.98" 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 100-Yr Rainfall=8.80" Area (ac) CN Description 0.210 98 Paved parking, HSG C 0.480 80 >75% Grass cover, Good, HSG D 0.690 85 Weighted Average 0.480 69.57% Pervious Area 0.210 30.43% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 Direct Entry, Subcatchment 8S: Post Area 1-6 (Onsite, Undetained) Hydrograph g 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 I I I I 1 1 73 cfs 1 1 1 1 1 1 1 1 1 1 1 7 I I I I I I I I 1 1 1 1 ITyrpe 111-2-1 r -4 I + 11 1 11 4 - - - —1I �1007Yr R1lainfa11=8.00'' 6 1 1 1 1 1 1 1 1 1 1Runbff Area=0.690 ad 5 1 1 RunmfflVb�ume=�01 of w 1 1 ] �-uinOff 11Deptl�>-6.68' 0 4 1 1 1 1 1 1 1 1 1 1 1 Tc=8.10 Ihiih LL -I-�-1- 3 CN;:8b I I I I I I I I 2 I I I I I 1 I 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) ■ Runoff Keswick Hall_C.E.P. (POST) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 38 Summary for Subcatchment 12S: Post Area 2-2 (Onsite, Undetained) Runoff = 9.97 cfs @ 11.98 hrs, Volume= 0.515 af, Depth> 6.37" 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 100-Yr Rainfall=8.80" Area (ac) CN Description 0.970 80 >75% Grass cover, Good, HSG D 0.970 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 Direct Entry, Subcatchment 12S: Post Area 2-2 (Onsite, Undetained) 11 10 9 1 —I_ L _I 8 7 --1-7-1—T-1 `-' 6 o 5 _ I— 1 —I— L _ I 4 3 2 1 Hydrograph — — —I— 4- —1— 4- —1 — 1-- 1 —1— —1 I I I I I I I I I I I I r 9.9cis —1 — T- —1 — — I — 1— 7 —1 — r —1 — 1 I I I _ 1T pe Ili 24-hr L1 ovyt R,ainf�Ilz8.00� Runbff Ate&0.970 arc +—I-1---4—I—+-1—�-1—+ IRunoffl Volumle=;0.515 of �nQff11C�rp h>s- 71 1 ' Tc:�7.10 tnih -i—I-1—I—L-1—L 1 1 1 1 CN:;:80 -��——+——t—I—� T 1 1 I I 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) ■ Runoff Keswick Hall_C.E.P. (POST) Type // 24-hr 100-YrRainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCAD® 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 39 Summary for Pond 6P: Bioretention #1 Inflow Area = 0.830 ac, 36.14% Impervious, Inflow Depth > 7.17" for 100-Yr event Inflow = 9.23 cfs @ 11.97 hrs, Volume= 0.496 of Outflow = 6.90 cfs @ 12.04 hrs, Volume= 0.403 af, Atten= 25%, Lag= 3.9 min Primary = 6.90 cfs @ 12.04 hrs, Volume= 0.403 of Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs Peak Elev= 438.90' @ 12.04 hrs Surf.Area= 2,996 sf Storage= 7,328 cf Plug -Flow detention time=129.6 min calculated for 0.402 of (81 % of inflow) Center -of -Mass det. time= 54.2 min ( 833.8 - 779.6 ) Volume Invert Avail.Storage Storage Description #1 432.00' 7,637 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 3,066 100.0 4,759 7,637 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 T Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 437.50' 18.0" Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=6.82 cfs @ 12.04 hrs HW=438.88' (Free Discharge) L1=Culvert (Passes 6.82 cfs of 12.57 cfs potential flow) L2=Orifice/Grate (Orifice Controls 6.82 cfs @ 4.00 fps) Keswick Hall_C.E.P. (POST) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 40 Pond 6P: Bioretention #1 Hydrograph / ■Inflow 10 1- 1 1 J 1 1 9.2s A I 1 ❑ Primary 1 1 1 1 1 I Inflow lArea=0.830lac 9 I Peak 1Elievr=4 0' 8 699 cfs torageT7,3 8 Ci 11 7 I I I I I I I I I I I I I I I I I N g 3 5 —1— —1 —I— —I— i- —I— —I— —1— -1 0 4 3 rt I F I I rt I F-T I I T--1 1 7 1 F-1 / 2 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) Keswick Hall_C.E.P. (POST) Type 1124-hr 100-Yr Rainfall=8.80" Prepared by Timmons Group Printed 7/18/2018 HydroCADO 10.00-20 s/n 06538 © 2017 HydroCAD Software Solutions LLC Page 41 Summary for Link 9L: Areas Combined (Bioretention + Post 1-6) Inflow Area = 1.520 ac, 33.55% Impervious, Inflow Depth > 6.35" for 100-Yr event Inflow = 13.95 cfs @ 12.00 hrs, Volume= 0.804 of Primary = 13.95 cfs @ 12.00 hrs, Volume= 0.804 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs 1 1 1 1 1 1 N U 3 0 LL Link 9L: Areas Combined (Bioretention + Post 1-6) Hydrograph 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) ■ Inflow ❑ Primary