Stormwater.pca.state.mn.us
Soildetermined on siteI/P ratiodetermine from plotTermValueUnitsArea of effective pervious (Aeffective p)acresdetermined on siteArea of ineffective pervious (Aineffective p)acresdetermined on siteArea of redirected impervious (Aredirected i)acresdetermined on siteArea of non-redirected impervious (Anon-redirected i)acresdetermined on siteRunoff depth from pervious (RDp)inchesdefault = 4.4 for A soil, 5.7 for B, 6.1 for C, 7.2 for DRunoff depth redirected (RDredirect)inchesdetermine from plotRunoff depth impervious (RDi)inchesdefault = 22.5 inchesRunoff from impervious pre-disconnect=B12/12*(B8+B9)*43560ft3calculatedRunoff from pervious pre-disconnect=B10/12*(B6+B7)*43560ft3calculatedPre-disconnect total runoff=B14+B13ft3calculatedPost disconnect impervious runoff=B12/12*43560*B9ft3calculatedPost disconnect pervious runoff=B10*43560*B7/12ft3calculatedPost disconnect effective pervious runoff=(B8+B6)*43560*B11/12ft3calculatedPost disconnection runoff=B18+B17+B16ft3calculatedPost impervious runoff=B19-B14ft3calculatedRunoff reduction from impervious=B13-B20ft3calculatedAdjusted impervious area (Aadjust i)=B20/B12*12/43560acrescalculatedBMP volume credit (BMPvolume credit)=0.092*(B8+B9-B22)*43560ft3calculated ................
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