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<br />NORTHERN COAL COMPANY <br />MEEKER WASTE DISPOSAL FACII..ITY <br />SEDIMENT POND SIZING CALCULATIONS <br />1. <br />2. <br />then, <br />REQUIRED VOLUME <br />1) Contain 10 yr24 hr runoff <br />2) Contain 2 days groundwater flow <br />3) Contain 3 yrs sediment production <br />RUNOFF VOLUME <br />Method - SCS <br />Precipitation <br />CN <br />Runoff <br />Runoff Volume <br />= 1.9 inches <br />= 77 (see attachment 1) <br />= 0.45 inches <br />= 0.45 inches over 41.7 acres <br />= 1.56 acre-ft <br />GROUND WATER FLOW <br />QGW = KiA <br />h = 25 ft (head drop RD-14 to P=2) <br />L = 250 ft <br />i = 0.10 ft/ft <br />