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SCS Curve Numbers(CN) Page I of 1 <br /> SCS Curve Numbers (CN) <br /> Land Use Description Hydrologic Soil Group <br /> Residential A B C D` <br /> Average lot size: <br /> 1/8 acre or smaller 77 85 90 92 <br /> 1/4 acre 61 75 83 87 <br /> 1/3 acre 57 72 81 86 <br /> 112 acre 54 70 80 85 <br /> 1 acre 51 68 79 84 <br /> 2 acre 46 65 77 82 <br /> 1/8 acre or smaller 77 85 90 92 <br /> Paved parking lots and roofs 98 98 98 98 <br /> Streets and roads: <br /> Paved with curbs 98 98 98 98 <br /> Gravel 76 85 89 91 <br /> Dirt 72 82 87 89 <br /> Commercial and business areas 89 92 94 95 <br /> Industrial districts 81 88 91 93 <br /> Open spaces, lawns, and parks: <br /> Good condition 39 61 74 80 <br /> Fair condition 49 69 79 84 <br /> Fallow 77 86 91 94 <br /> Row crops 72 81 88 91 <br /> *Average Runoff Condition. la = 0.2S <br /> Source: Soil Conservation Service TR-55 <br /> mk:@M SITStore:C:\Program%20Fi les\Autodesk\AutoCAD%202015\C3 D\HHApps\Hyd... 06/08/2014 <br />