Runoff Curve Numbers*

                                           Hydrologic Soil Group
Land Use, Crop, and Management            A      B      C      D

CULTIVATED, with crop rotations
   Row Crops, poor management            72     81     88     91
   Row Crops, conservation mgmt          65     75     82     86
   Small Grains, poor management         65     76     84     88
   Small Grains, conservation mgmt       61     73     81     84
   Meadow                                55     69     78     83

PASTURE, permanent w/moderate grazing    39     61     74     80

WOODS, permanent, mature, no grazing     25     55     70     77

ROADS, hard surfaces and roof areas      74     84     90     92

Hydrologic Soil Group Descriptions:
A -- Well-drained sand and gravel; high permeability.
B -- Moderate to well-drained; moderately fine to moderately coarse texture; moderate permeability.
C -- Poor to moderately well-drained; moderately fine to fine texture; slow permeability.
D -- Poorly drained, clay soils with high swelling potential, permanent high water table, claypan, or shallow soils over nearly impervious layer(s).

*For average antecedent mositure conditions in a watershed.

Source: National Engineering Handbook, USDA-NRCS, Hydrology Section 4, 1972.