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Tons/Ac/ • <br />Condition Area (ac.) R K LS C P Vear Tons/Year <br />Undisturbed 9.912 30 0.19 13.41 .0002 1.0 0.153 .16 <br />Reclaimed 79.583 30 0.32 13.41 0.0031 1.0 0.40 :1.76 <br /> ;i1 .78 tons <br />31.78 tons x 604 delivery ratio = 19.065 tons/year <br />Based on sediment density of 80 lbs/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 -f t. <br />The clea no ut level is 604 of capacity. Therefore, when the sediment volume reaches 14.6 <br />ac -f t, 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 particle size distribution for this impoundment, shown <br />below, was based on sieve and hydrometer analysis of various soil types in the Seneca II <br />permit area. This distribution is representative of the watershed for PECOCO and based on <br />a weighted average. <br />PECOCO • <br />Size (mm) Watershed <br />72,7 100 <br />11.2 97 <br />2.0 92 <br />1.0 89 <br />0.5 87 <br />0.25 85 <br />0.106 81 <br />0.045 44 <br />0.02 35 <br />0.01 25 <br />0.005 19 <br />0.002 14 <br />0.001 10 <br />0.0001 0 <br />Slope Length. The slope length is ee sc ri bed as ^_hr ty p~cal slope length. +nr the watershed • <br />and the d15Cd ncP, from the point of cri qin of overland flow until the point ::hat the :iooe <br />7-Fq-14 <br />