Runoff Coefficients for Rational Equation*

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

CULTIVATED, with crop rotations
   Row Crops, poor management           .55    .65    .70    .75
   Row Crops, conservation mgmt         .50    .55    .65    .70
   Small Grains, poor management        .35    .40    .45    .50
   Small Grains, conservation mgmt      .20    .22    .25    .30 
   Meadow                               .30    .35    .40    .45

PASTURE, permanent w/moderate grazing   .10    .20    .25    .30

WOODS, permanent, mature, no grazing    .06    .13    .16    .20 

Urban residential
   30 percent of area impervious        .30    .40    .45    .50
   70 percent of area impervious        .50    .60    .70    .80

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).