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NRCS Curve Numbers (CN)

Land Use DescriptionHydrologic Soil Group
Source: Soil Conservation Service TR-55
ResidentialABCD
Average Lot Size
1/8 acre or less77859092
1/4 acre61
758387
1/3 acre
57728186
1/2 acre
54708085
1 acre
51687984
2 acre
46657782
Paved parking, roofs98989898
Streets and Roads
Paved with curbs98989898
Gravel
76858991
Dirt
72828789
Commercial and business areas 89
929495
Industrial districts
81889193
Open spaces, lawns, parks
good condition39
617480
fair condition
49697984
Fallow
77869194
Row Crops
72818891

 

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