HomeMy WebLinkAboutWPO201600026 Calculations 2014-06-01 Y
Virginia Runoff Reduction Method New Development Worksheet-v2.8-June 2014
To be used w/2011 BMP Standards and Specifications
Site Data
THE HICKS RESINDENCE
Date: 04/05/16
data input cells
a, calculation cells
constant values
1. Post-Development Project&Land Cover Information
Constants
Annual Rainfall(inches)
Target Rainfall Event(inches) 1.00
Phosphorus EMC(mg/L) 0.26 Nitrogen EMC(mg/L) 1.86
Target Phosphorus Target Load(Ib/acre/yr) 0.41
Pj 0.90
Land Cover (acres) -
A soils B Solis C Soils DSoils Totals
Forest/Open Space(acres)-undisturbed, r
protected forest/open space or reforested land 1 12.53
Managed Turf(acres)--disturbed,graded for
yards or other turf to be mowed/managed 0.00 8.00 0.00 0.00 8.00
Impervious Cover(acres) 0.57 0.00 0.57
Total 21.10 MI
Rv Coefficients -
A soils B Soils C Soils D Soils
Forest/Open Space 0.02 0.03 0.04 0.05
Managed Turf 0.15 0.20 0.22 0.25
Impervious Cover 0.95 0.95 0.95 0.95
Land Cover Summary
Forest/Open Space Cover(acres) 12.53
Weighted Rv(forest) 0.03
%Forest 59% -
Managed Turf Cover(acres) 8.00 _
Weighted Rv(turf) 0.20 _
%Managed Turf 38%
Impervious Cover(acres) 0.57 _
Rv(impervious) 0.95
%Impervious 3%
Total Site Area(acres) 21.10
Site Rv 0.12
Post-Development Treatment Volume(acre-ft) 0.2'1 --
Post-Development Treatment Volume(cubic -
feet) 9,280
Post_Development Load(TP)(Ib/yr) 5.56 Post_Development Load(TN)(Ib/yr)I 37517
Total Load(TP)Reduction Required(Ib/yr) -3.09
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