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From Design Hydrolozy and Sedimentolog y ofSmall Catchments (Barfield, et. al.) <br />Table 4.5 Permissible velocities for Vegetated Channels (Ree, 1949) <br /> <br /> <br /> <br />over Permissible velocity (fps) <br />Erosion-resistant soils Easily eroded soils <br />(% slope) (% slope) <br />0-5 5-10 Over 10 0-5 5-10 Over 10 <br />Bermuda grass 8 7 6 6 5 4 <br />Buffalo grass <br />Kentucky bluegrass <br />Smooth brome 7 6 5 5 4 3 <br />Blue grama <br />Tall fescue <br />Lespedeza sericea <br />Weeping lovegrass <br />Kudzu 3.5 NRa NR 2.5 NR NR <br />Alfalfa <br />Crabgrass <br />Grass mixture 5 4 NR 4 3 NR <br />Annuals for temporary <br />protection 3.5 NR NR 2.5 NR NR <br />aNot recommended. <br />Tri County Dike Slope Stability Jan 08 9