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HomeMy WebLinkAboutWPO201900006 Calculations 2019-03-01 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 Project Title The Covenant School Date 44292 Total Rainfall(in): 43 Total Disturbed Acreage: 0.12 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 0.11 0.00 0 00 0 11 92 Impervious Cover(acres) 0 00 0.01 0.00 0.00 0 01 8 0 12 100 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 08 0 00 0.00 0 08 67 Impervious Cover(acres) 0 00 0 04 0 00 0.00 0 04 33 0 12 100 Site Tv and Land Cover Nutrient Loads Pre- Final Post-Development Post- Post- Adjusted Pre- ReDevelopment Final Post-Development Post-ReDevelopment TP (Post-ReDevelopment TP Load per acre Load per acre ReDevelopment Development ReDevelopment TP Load per acre &New Impervious) (New Impervious) (Ib/acre/yr) (Ib/acre/yr) (Ib/acre/yr) Site Rv 0.45 0 28 0 95 0 28 0.65 1.03 0.65 Treatment Volume(ft3) 196 - 93 103 93 TP Load(Ib/yr) 0.12 0 06 0.07 0.06 Total TP Load Reduction Required(Ib/yr) 0.06 0.01 0 05 Final Post-Development Load Pre- (Post-ReDevelopment&New Impervious) ReDevelopment TN Load(Ib/yr) 0.88 0 51 Summary Pnnt Virginia Runoff Reduction Method Worksheet Site Compliance Summary Maximum%Reduction Required Below Pre-ReDevelopment Load 10/ Total Runoff Volume Reduction(ft') 0 Total TP Load Reduction Achieved(Ib/yr) 0.00 Total TN Load Reduction Achieved(Ib/yr) 0 00 Remaining Post Development TP Load 0 12 (Ib/yr) Remaining TP Load Reduction(Ib/yr) 0.06 Required Summary Print Virginia Runoff Reduction Method Worksheet Drainage Area Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total Forest/Open(acres) 0 00 0.00 0 00 0 00 0.00 0 00 Managed Turf(acres) 0 08 0 00 0 00 0 00 0 00 0 08 Impervious Cover(acres) 0.04 0 00 0 00 0.00 0 00 0 04 Total Area(acres) 0.12 0.00 0.00 0.00 0.00 0.12 Drainage Area Compliance Summary D.A.A D.A.B D.A.C D.A.D D.A.E Total TP Load Reduced(Ib/yr) 0.00 0 00 0 00 0.00 0.00 0 00 TN Load Reduced(Ib/yr) 0 00 0 00 0 00 0.00 0 00 0 00 Summary Print Virginia Runoff Reduction Method Worksheet Runoff Volume and CN Calculations 1-year storm 2-year storm 10-year storm Target Rainfall Event(in) 3.05 3.69 5.58 Drainage Areas RV&CN Drainage Area A Drainage Area B Drainage Area C Drainage Area D Drainage Area E CN 73 0 0 0 0 RR(ft3) 0 0 0 0 0 RV wo RR(ws-in) 0 89 0 00 0 00 0 00 0 00 1-year return period RV w RR(ws-in) 0 89 0 00 0.00 0 00 0 00 CN adjusted 73 0 0 0 0 RV wo RR(ws-In) 1 31 0 00 0 00 0 00 0.00 2-year return period RV w RR(ws-in) 1 31 0 00 0 00 0 00 0.00 CN adjusted 73 0 0 0 0 RV wo RR(ws-In) 2 74 0 00 0 00 0 00 0 00 10-year return period RV w RR(ws-in) 2 74 0.00 0.00 0 00 0 00 CN adjusted 73 0 0 0 0 Summary Pnnt