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RUNOFF COEFFICIENT CALCULATIONS <br /> I,Total Site Area must be entered in"Summary Sheet"before you can proceed <br /> PRE-PROJECT WEIGHTED RUNOFF COEFFICIENT <br /> Site Element Element Runoff Element Area,ft2 Fraction of Total Weighted Runoff Notes <br /> Coefficient*(Cr) (A.,emem) Area Al-nt/APRE) Coefficient(C,PRE) <br /> Select a site element from the drop down list;a corresponding <br /> Forest-Undisturbed Open Space:Type C/D Soil 0.05 394652.0 1.00 0.05 runoff coefficient will appear;if you wish to enter your own, <br /> please use Other 1 though 3 below <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> Permeable Pavement 0.00 0.00 Runoff coefficient for permeable pavers will vary.Please <br /> consult the manufacturer for appropriate design values. <br /> Use Other 1,Other 2,and Other 3 if a particular site element is <br /> Other1: 0.00 0.00 not included in the drop down list.To do so manually enter the <br /> name of the new site element into the row and corresponding <br /> runoff coefficient. <br /> Other2: 0.00 0.00 <br /> Other 3: 0.00 0.00 <br /> TOTAL SITE 394652.0 0.05 Make sure the Total for the Element Area column adds up to <br /> the Total Area of the Site(APRE) <br /> *Adapted from the Center for Watershed Protection,Ellicott City,MD <br /> POST-PROJECT WEIGHTED RUNOFF COEFFICIENT <br /> Site Element Element Runoff Element Area,ft2 Fraction of Total Weighted Runoff Notes <br /> Coefficient*(Cr) (Aeieme„t) Area(A.W.e./APRE) Coefficient(C,PosT) <br /> Forest_Undisturbed Open Space:Type C/D Soil 0.05 143645.0 0.36 0.02 Select a site element from the drop down list;a corresponding <br /> runoff coefficient will appear <br /> Asphalt/concrete pavement 0.95 218441.0 0.55 0.53 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> 0.00 0.00 <br /> Permeable Pavement 0.00 0.00 Runoff coefficient for permeable pavers will vary.Please <br /> consult the manufacturer for appropriate design values. <br /> Use Other 1,Other 2,and Other 3 if a particular site element is <br /> Other1:Bioretention Basin 1.00 32566.0 0.08 0.08 not included in the drop down list.To do so manually enter the <br /> name of the new site element into the row and corresponding <br /> runoff coefficient. <br /> Other2: 0.00 0.00 <br /> Other 3: 0.00 0.00 <br /> TOTAL SITE 394652.0 0.63 Make sure the Total for the Element Area column adds up to <br /> the Total Area of the Site(APRE) <br /> *Adapted from the Center for Watershed Protection,Ellicott City,MD <br />