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• <br />1.4 Rock Dam Requirements <br />Rock Dam Permissivity: <br />Required Surface Area: <br />0.069 cfs/f[ <br />0.37 cfs/0.069 cfs/f[= 5.4 ft' <br />Discharge through the rock dam was determined using a flow velocity of 0.069 fps. This velocity was <br />derived from data obtained from the U.S. Department of the Interiors' Engineering and Design Manual for <br />Disposal of Excess Spoils. <br />I.5 Silt Fence Requirements <br />Silt Fence Permissivity: ] 5 gal/mirJf[ or 0.033cfs/fl' <br />Required Surface Area: 0.37 cfs/0.033 cfs/(r'= 11.2 fr <br />C~ <br />n <br />U <br />