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1.4 Rock Dam Requirements <br />• Rock Dam Permissivit}': 0.069 cfs/f[ <br />Required Surface Area: 1.1 cfs/0.069 cfs/f[= 15.9 ft'' <br />Discharge through the rock darn was determined using a flow velocity of 0.069 fps. This velocity was <br />derived from data obtained from the U.S. Department of [he Interiors' Engineering and Design Manual for <br />Disposal of Excess Spoils. <br />I.5 Silt Fence Requirements <br />Silt Fence Permissivity: <br />Required Surface Area: <br />• <br />15 gaUmin/f[ or 0.033cfs/fC <br />I.1 cfs/0.033 cfs/f~ = 33.3 ft'' <br /> <br />