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• Table 6.1a. Maximum Permissible Velocities Tables <br /> by Foctier and Scobey (1926). <br /> Mean velocity of canals after a ging (dt3 ft) <br /> water <br /> transporting <br /> Water noncolloidal <br /> transporting silts, sands <br /> Original Material Clear water, colloidal gravels or <br /> Excevaied no detritus silt rock fragments <br /> . For Canals n ft/aec m/sec ft/sec m/sec ft/sec m/sec <br /> 1. Fine sand <br /> (colloidal) 0.02 1.5 0.46 2.50 0.76 1.50 0.46 <br /> 2. Sandy loam <br /> (noncolloidal) 0.02 1.45 0.53 2.50 0.76 2.00 0.61 <br /> 3. Silt loam <br /> (noncolloidal) 0.02 2.00 0.61 3.00 0.91 2.00 0.61 <br /> 4. Alluvial silt <br /> when noncolloidal 0.02 2.00 0.61 3.50 1.07 2.00 0.61 <br />• 5. Ordinary firm loam 0.02 2.50 0.76 3.50 1.07 2.25 0.69 <br /> 6. Volcanic ash 0.02 2.50 0.76 3.50 1.07 2.00 0.61 <br /> 7. ' Fine gravel 0.02 2.50 0.76 5.00 1.52 3.75 1.14 <br /> 8. Stiff clay (very <br /> colloidal) 0.025 3.75 1.14 5.00 1.52 3.00 0.91 <br />12. Coarse gravel <br />5.00 1.52 3.00 0.91 <br />colloidal 0.03 4.00 1.22 5.50 1.68 5.00 1.52 <br />10. Alluvial silt <br />when colloidal 0.025 3.75 1.14 <br />11. Graded, slit to <br />cobbles, when <br />noncolloidal 0.03 3.75 1.14 5.00 1.52 5.00 1.52 <br />9. Graded, loam to <br />cobbles, when <br />(noncolloidal) 0.025 4.00 1.22 6.00 <br />• <br />13. Cobbles and <br />ehingles 0.035 5.00 1.52 5.50 <br />14. Shales end <br />hard pans O.D25 6.00 1.83 6.00 <br />1.83 6.50 1.98 <br />1.68 6.50 1.98 <br />1.83 5.00 1.52 <br />