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,,,,, Rear Coal Company _ _ 8580 <br />' UTE ENGINEERING & SURVEYING CO. <br />P. 0. Box 674 355 Main Street <br />DELTA, COLORADO 81416 <br />(303) 874-7593 <br />ne.vti~-~vrw wie. rwae.u tin .~vil.r~a i yNe <br />~I <br />Unaffected area runoff <br />S = 1,000 - 10 = 1,000 _ 10 = 18..57 <br />CN 35 <br /> <br /> <br />Sii4R1 t~U ? _..-__._ OF-...-6--- -- <br />cArcu~Airurr~_ FDR_._____ __ nnre_-_3=4~0-_ <br />s~iECKeo o. _ _ ---- _-- .._ __ onre_ -_--.-- <br />rinure ~.u~,.31~1 1n1-%._.lcon~.t)__ <br />Find amount of rain to initate runoffs ~ = 0 <br />(P - 0.?_S)2 = 0 = ~P - 0.2(18.57)) 2 <br />P + O.BS P + 0.3(18.~i7) <br />P = 3.71"> 1.6" <br />No runoff for 10 year - 24 hour storm from unaffected area. <br />Affected area runoff: <br /> <br />1 <br />1 <br />s = 1~N00 - to = 1'00 - to = 4.2sc <br />(P - 0.25)2 _ [1.8 - .2(4.7.86) -' = 0.17" <br />- P + O.BS 1.£? + ,8(4.28() <br />Volume of runoff = 0.17"/1?"/ft•(7.89,000 ft?) = 4094 ft3 <br />Calculate Sediment load, Reference Predicting Rainfall Erosion <br />bosses, Agriculture Handbook <br />pp 537. <br />From unaffected area A = RKLSCP <br />The undistured area is divided into 3 segments <br />Segment 1 - 400 ft 38$ akope <br />Segment 2 - 400 ft 10% hfope <br />Segment 3 - 400 ft 59% A~ope <br />REVISED May 15, 1981 <br />~.,...,., >.~,~.~~. ,~. ,,v„~ ..•. ~...~~,.•.,, ~..,>, ~ ..,, <br />