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HomeMy WebLinkAboutWPO201600031 Calculations 2020-04-23DEQ Virginia Runoff Reduction Method New Development Compliance Spreadsheet - Version 3.0 2012 BMP Standards and Specifications El 2013 Draft BMP Standards and Specifications AM Project Name: Whittington Phase B VSMP Amendment .at 4/23/2020 ecifications List: 2013 Draft Stds & Specs ASoils BSoils CSoils DSoils Totals Forest/Open Space (acres) -- undisturbed, protected forest/open sace or reforested land 0.55 0.45 1.00 Managed Turf (acres) -- disturbed, graded for yards or other turf to be mowed/managed 0.00 Impervious Cover (acres) 0.00 ' Forest/Open Space areas must be protected in accordance with the Virginia Runoff Reduction Method 1.00 Constants Annual Rainfall (inches) 43 Target Rainfall Event (inches) 1.00 Total Phosphorus (TP) EMC (mg/L) 0.26 Total Nitrogen (TN) EMC (mg/L) 1.86 Target TP Load (Ib/acre/yr) 0.41 Pj (unitless correction factor) 0.90 A Soils B Soils C Soils D Soils Forest/Open Space 0.02 0.03 0.04 0.05 Managed Turf 1 0.15 0.20 0.22 0.25 Impervious Cover 1 0.95 0.95 0.95 0.95 Treatment Volume (acre-ft) 0.0029 Treatment Volume (cubic feet) 125 TP Load (lb/yr) 0.08 TN Load (Ib yr) Informational Purposes Only) 0.56 Site Results (Water Quality Compliance) Area Checks D.A. A 0.00 0.00 0.00 0.00 M. OK. D.A. B 0.00 0.00 0.00 0.00 0.00 OK. D.A. C 0.00 0.00 0.00 0.00 0.00 OK. D.A. D D.A. E AREA CHECK FOREST/OPEN SPACE (ac) IMPERVIOUS COVER(ac) IMPERVIOUS COVER TREATED (ac) MANAGED TURF AREA(ac) MANAGED TURF AREA TREATED(ac) AREA CHECK Site Treatment Volume (fti) E0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 OK. OK. OK. OK. OK. OK. OK. szs Runoff Reduction Volume and TP By Drainage Area RUNOFF REDUCTION VOLUME ACHIEVED (fla) 0 0 0 0 0 0 TP LOAD AVAILABLE FOR REMOVAL (Ib/yr) 0.00 0.00 0.00 0.00 0.00 0.00 TP LOAD REDUCTION ACHIEVED (Ib/yr) 0.00 0.00 0.00 0.00 0.00 0.00 TP LOAD REMAINING Qb/yr) 0.00 0.00 0.00 0.00 0.00E 0.00 NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr) 0.00 0.00 0.00 0.00 0.00 0.00 Total Phosphorus FINAL POST -DEVELOPMENT TP LOAD (Ib/yr) F 0.08 TP LOAD REDUCTION REQUIRED (Ib/yr) 0.33 0.00 TP LOAD REDUCTION ACHIEVED (Ib/yr) TP LOAD REMAINING (Ib/yr): REMAINING TP LOAD REDUCTION REQUIRED (Ib/yr): 0.08 0.00 Total Nitrogen (For Information Purposes) "* TARGET TP REDUCTION EXCEEDED BY 0.33 LB/YEAR ** POST -DEVELOPMENT LOAD (Ib/yr) NITROGEN LOAD REDUCTION ACHIEVED (Ib/yr) 0.96 0.0 REMAINING POST -DEVELOPMENT NITROGEN LOAD (Ib/yr) 0.5