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<br />• <br />Table 6.1c. Maximum Permissible Velocities Tables) <br />by U.S. Army Office (1970). <br />Mean Channel <br />Channel Material Velocity (tpe) <br />Find sand 2.0 <br />Coarse sand 4.0 <br />Pine gravel2 6.0 <br />Barth <br />Sandy eilc 2.0 <br />Silt clay 3.5 <br />Clay 6.0 <br />Grass-lined earth (elopes < Si)3 <br />Bermuda grass - sandy silt 6.0 <br />- 911t Cldy B.~ <br />Kentucky Blue Gr ass - sandy silt 5.0 <br /> - silt clay 7.0 <br />Poor rock (usually sedimentary) 10.0 <br />Sofe sandstone 8.0 <br />Soft shale ].5 <br />Good rook (usually igneous oz hard <br />meeamorphic)• 20.0 <br />LBaeed on TM 5-886-4 and CE Hydraulic Design <br />Conferences o[ 1958-1960. <br />2For particles lase than tine gravel (about 20 mm <br />3/6 in.1. <br />3Reep velocities less than 5.0 fps unless good <br />eowr and proper maintemncs can be obtained. <br />•May be used rith judgment in durable bedrock. <br /> <br />