Fair Haven City Zoning Code
§ 30-9.3L
Exhibit L.
[2002 Code § Exhibit 16.36.030L]
PERMISSION VELOCITIES FOR SWALES, OPEN CHANNELS, AND DITCHES WITH UNIFORM STANDS OF VARIOUS WELL-MAINTAINED GRASS COVERS | |||
|---|---|---|---|
Permissible Velocity on: | |||
Ground Cover | Slope Range Percent | Erosion-Resistant Soils (fps) | Easily Eroded Soils (fps) |
Bermuda grass | 0—5 | 8 | 6 |
5—10 | 7 | 5 | |
Over 10 | 6 | 4 | |
Buffalo grass | 0—5 | 7 | 5 |
Kentucky bluegrass | 5—1 | 6 | 4 |
Smooth brome | Over 10 | 5 | 3 |
Grass mixture | 0—5 | 5 | 4 |
5—10 | 4 | 3 | |
Lespedeza | 0—5 | 3.5 | 2.5 |
Weeping love grass | |||
Yellow bluestem | |||
Kudzu | |||
Alfalfa | |||
Crabgrass | |||
Common lespedeza | 0—5 | 3.5 | 2.5 |
Sundan grass | |||
fps = feet per second | |||
Source: Soil Conservation Service, U.S. Department of Agriculture (Washington, D.C.: Government Printing Office, 1959). Cited in ULI-ASCE-NAHB, Residential Storm Water Management (Washington, D.C.: Government Printing Office, 1975). |