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• <br />L� <br />• <br />Condition <br />Area (ac.) <br />R <br />K <br />LS <br />Undisturbed <br />9.912 <br />30 <br />0.19 <br />13.41 <br />Reclaimed <br />79.583 <br />30 <br />0.32 <br />13.41 <br />31.78 tons x 60b.delivery ratio = 19.065 tons /year <br />Tons /Ac/ <br />particle size distribution for this impoundment, shown <br />C P Year <br />Tons /Year <br />.0002 1.0 0.153 <br />.15 <br />0.0031 1.0 0.40 <br />31.76 <br />the watershed for PECOCO and based on <br />31.78 tons <br />Based on sediment density of 80 1 bs /cu ft, this amounts to 476.6 cu ft /yr or 17.65 cu <br />yds /yr or 0.011 ac-ft per year. The amount of initial sediment storage is 24.31 ac -ft. <br />The cleanout level is 60% of capacity. Therefore, when the sediment volume reaches 14.6 <br />ac -ft, the pond would need to be cleaned out. This should take approximately 1,326 years <br />to reach this level. <br />Particle Size Distribution The <br />particle size distribution for this impoundment, shown <br />below, was based on sieve and hydrometer analysis of <br />various soil types in the Seneca II <br />permit area. This distribution is <br />representative of <br />the watershed for PECOCO and based on <br />a weighted average. <br />PECOCO <br />Size (mm) <br />Watershed <br />12.7 <br />100 <br />11.2 <br />97 <br />2.0 <br />92 <br />1.0 <br />89 <br />0.5 <br />87 <br />0.25 <br />85 <br />0.106 <br />81 <br />0.045 <br />44 <br />0.02 <br />35 <br />0.01 <br />25 <br />0.005 <br />19 <br />0.002 <br />14 <br />0.001 <br />10 <br />0.0001 <br />0 <br />?. pe Length The slope l , �ngth is <br />df scr i hed as t..he <br />•; pica l S' opf� ! f�-ngth f ^r t hP .vaterr,hf d <br />and the (listance from the point o f <br />origin of overland <br />fl, until t`e aoint th.ct ` lope <br />7 -rg -14 <br />NOR Og6574 <br />