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Composite Curve Number With An Unconnected Impervious Area
Composite Curve Number With An Unconnected Impervious Area
This calculation is to be used for calculating the composite CN for area with an unconnected impervious area and a total impervious area of less than 30%.
Pervious runoff curve number (CNp)
Percent imperviousness (Pimp - %)
Ratio of unconnected impervious area to total impervious area, (R)
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Result
Composite runoff curve number
CNp - Pervious runoff curve number
Pimp - Percent imperviousness
R - Ratio of unconnected impervious area to total impervious area
CNc - Composite runoff curve number
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