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<br />Sable 4.6-9 Emergency Spillway Calculations for Moffat Area Pond <br /> Emergency <br /> Primary Spillway <br /> <br />F1 va 'on <br />c as Spillway <br />Outflow Outflow <br />(width 13'1 Total <br />Outflow <br />6992.6 0.0 0.0 0.0 0.0 <br />6999.6 7.0 0.0 0.0 0.0 <br />7000.0 7,4 0.4 0.0 0.9 <br />7000.1 7,5 0.5 0.0 0.5 <br />7001.0 8,9 3.0 0.0 3.0 <br />7003.9 11.3 6.5 0.0 6.5 <br />7004.5 11,9 6.9 18.65 25.55 <br />7005.0 12.4 7.0 46.30 53.30 <br />Emergency Spillway Design <br />25-yr, 24-hr Outflow 30.196 cfs (From SEDIMOT II Output, Appendix <br />4.6-C) <br />25-y r, 24-hr Peak Stage 11.98 ft (From SEDIMOT II Output, Appendix <br />4.6-C) <br />30.2 - 6.9 23.3 (Discharge needed to pass through Emergency Spillway) <br />Q = CLH3~z (Equation 4.1, pg. 230, "Applied Hydrology b Sedimentology <br />For Disturbed Acres", Barfield, Warner and Haan.) <br />Try 13 ft wide spillway <br />Q 3.087 (13) (7004.6-7003.9)312 <br />Q = 23.5 23.5 2 23.3, use 13 ft for length of spillway <br />Velocity Calculation <br />Q = AV <br />A = 2(0.5)(2.1)(0.7) + 0.7 (13) = 10.57 sq.ft. <br />~, V = Q/A = 30.2 cfs/10.57 sq.ft. = 2.9 cfs through control section <br />4.6-35 <br />xovember 1,1989 <br />