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<br />Based on sediment density of 80 lbs/cu ft this amounts to 98,788 cu ft/yr or 3,659 cu • <br /> i <br />yds/yr or 2.27 ac-ft per year. The amount of estimated sediment storage is 9.4 ac-ft or <br /> <br />4.1 years of sediment storage. The cleanout level is 609 of capacity. Therefore when the <br />sediment volume reaches 5.6 ac-f t, the pond will be cleaned out <br />Particle Size Distributions. The particle size distribution for this sedimentation pond <br />was based on sieve and hydrometer analysis of various soil types in the Seneca II permit <br />I <br />area. This distribution is representative of the watershed for Pond 009 and based on a <br />weighted average. The specific gravity and the submerged bulk specific gravity of the <br />) <br />soil are estimated to be 2.50 and 1,25," respectively. <br />i <br />TABLE 13-5-4 <br />Sedimentology Size Analysis <br />Weighted Average <br /> Percent <br />Size (mm) Passing <br />12.7 100 <br />17.2 97 <br />2.0 91 <br />1.0 87 <br />0.5 84 <br />0.25 82 <br />0.106 79 <br />0.045 56 <br />0.02 40 <br />0,01 31 <br />0.005 24 <br />0.002 17 <br />0.001 14 <br />0.0001 0 <br />• <br />Length-Slope Factor (L,S). The length-slope is described as the typical length-slope for <br />the subwatershed and the distance from the point of origin of overland flow until the <br />point that the slope decreases such that significant deposition occurs or until the flow . <br />enters a defined channel. The length-slope for Pond 009 was determined to be 300 feet, <br />13-5-6 <br />