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<br />Table 6. 1b. Maximum Permissible Velocities Tables <br />by Etcheverry (1916). <br />u <br />Mean Velocity <br />Maearial (fps) <br />Very Light pure sand o[ quicksand character 0.75- 1.00 <br />Very light loose sand 1.00- 1.50 <br />Coarse sand or light sandy soil 1.50- 2.00 <br />Average sandy soil 2.00- 2.50 <br />Sandy Loam 2.50- 2.75 <br />Average loam, alluvial soil, volcanic ash soil 2.75- 3.00 <br />Firm loam, clay loam 3.00- 3.75 <br />Stiff clay soil, ordinary gravel soil 4.00- 5.00 <br />Coarse gravel, cobbles, shingles 5.00- 6.00 <br />Conglomerates, cemented gravel, sofe slate, tough hard-pan, <br />soft sedlmentary rods 6.00-, 8.00 <br />Hard rock 10.00-15.00 <br />Concrete 15.00-20.00 <br />u <br />