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6eah <br />• 25yr -- 24 hr = 0.93 inches <br />5. Determine peak discharge of runoff for CPJ90 (pp 18 -FIG. S-lA, SCS) <br />25 yr -- 24 hr = 9.5 cfs/inch of runoff <br />< 0.93 inch <br />= 8.8 cfs <br />Pond Design from Drawi <br />1. Pond volume <br />Principal spillway 0.65 acre ft <br />Emergency spillway 0.79 acre ft <br />2. Peak flow of Emergency Spillway <br />• 1 5 ~~ '2 4 ft 2 ft <br />Q= A ~ R~ S <br />Q = (oft * 2ft)(0.017)(4+2+2ftft)33 (0.02)2 <br />Q = (BftZ)(88.235)(1)(0.141) <br />Q = 99.5 cfs <br />Summary <br />1. Pond volume <br />lJater = 0.28 acre ft <br />Sediment = 0.15 acre ft = 0.035 acft/acre * 4.22 acre <br />Total vnli~me Headed = 0.43 acre ft <br />Designed for 0.65 acre ft <br />• 2. Peak flow in emergency spillway. <br />Peak discharge capacity needed = 8.8 cfs <br />Designed for = 99.5 cfs <br />