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Riprap Calculations <br />Nuvemco Last Chance Mine <br />Sediment Pond #1 Outlet Channel <br />W= 0.0002V /(SG- 2) SIN (r -a) <br />V = <br />2.13 fYsec <br />from FlowMaster <br />V'4 /3 <br />2.84 <br />for impingement <br />SG = <br />2.323718 <br />Sandstone - 145 Ibs /cubic foot <br />r = <br />70 degree <br />For dumped angular riprap <br />a = <br />18.43 degree <br />3:1 channel side slopes <br />r -a = <br />51.57 degree <br />r -a (RADIANS) <br />0.900066 radians <br />sin(r -a) = <br />0.783368 <br />sin 3 (r -a) = <br />0.480726 <br />SG -1 <br />W = <br />1.323718 <br />0.218695 pounds <br />(ti1o?,p,� �2gU11, <br />