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<br />UTE ENGINEERING & SURVEYING CO. <br />P. 0. Box 674 355 Main Street <br />DELTA, COLORADO 81416 <br />(303) 874.7593 <br />Affected Area runoff <br />1000 1000 10 = 2.5 <br />S.= CN - 10 = ~- <br />~oB Bear Coal Company 8580 <br />BHEET NO. 2 OF -3 <br />CALCULATED BY FDR DArE_3-4-80 <br />CHECKED BY DATE <br />Ficrure 2.05.3(4) (b)-:3 (con't) <br />2 . <br />(P - 0.25) _ :(1.8 - .2(2.5)) 2 44 <br />P + ,85 1.8 + (2.5 <br />Volume = 0.44"/12'.'/ft (40 ,000)ft2 = 1482 ft3 <br />;. <br />Calculate sediment load <br />_. , <br />Use .1 AF of storage for every acre of disturbed area. <br />.Sediment storage.=. 40,000 (0..1) _ .4000 ft3 or .0.092 acre-fee:t <br />.Total Pond Volume 1482.+ 9000 =.5482 ft3 or 0.126 acre-feeot <br />Spillway 25 year.storm <br />Use rational formula for. small areas w/no danger to human life for. <br />spillway..design.. <br />(~11.9(L3) •3fi5 _ 11.9 (, 2)3 .385 <br />Tc.- L H J - 118 ~ _ .06 HR . <br />L.= 1050' _ .2 mi H = 6150 - 6032 = 118 ft <br />Y = 12.7/10 25 year-1 hour est <br />2 5 .. ... _. ...... . <br />C~ AMC -II ...What size storm produces the greatest.runo.ff...ra.te.... . <br />.... <br />(P - .2S) 2 - , 5 CAS = 2..5., <br />_ _ _ <br />4 p + 0.85 P - <br />REVISED May 15, 1981 <br />iOHM ]D~ ArAYDM ~~Hm IBS inC iown~anO. MAll 01 t]0 <br />