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• The total sediment delivered (YS) is: <br />Ys = (R)(K)(LS)(CP) x CDR) <br />_ (16)(0.20)(9.0)(1.30) x (0.42) <br />YS = 15,72 Tons/Acre/Yr. <br />The affected area is 2,6 AC. <br />0 <br />0 o Ys = 15,72 tons/Ac/Yr. X 2.6 Ac = 40.9 TNS/YR, <br />= 41 TONSIYR. <br />Volume of Sediment Delivered is: <br />VS = YS (2000 LBSITON)(1 ACRE) <br />1.5 (62.4 Lss/FT3)(43,560 FTZ) <br />0 <br />0 0 Substituting YS into the preceding formula gives a <br />sediment volume of 0,02 A~C-FTIYR, (VS = 876 FT3) <br />Use VS = 900 FT3 UUU Total sediment volume for a <br />three year period shall be 2700 FT3• (0.062 AC-FT) <br />b) waste Rock Disposal Site - Sedimentation Reservoir <br />Emergency Spillway Design. <br />Problem: Determine hydraulic date of a trapezoidal shaped outlet <br />ditch, depth of flow at the design storm, and high water- <br />line elevation of the reservoir. <br />Solution: Maximum allowable velocity, VMAX = 2 FPS, <br />q2s =333 CFS (From Peak Discharge Calcs.) <br />• = 0,Q3 (manning coefficient for riprap) sideslope <br />= 2;1 (horizontal to vertical) slope (s) Q,QQ6 FTIFT <br /> <br />