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~~peuAiJC xXl-(~ <br />beak <br />• 25yr -- 24hr = 0.93 inches <br />5. Determine peak discharge of runoff for 01290 (pp 18 -FIG. S-lA, SCS) <br />25 yr -- 24hr = 9.5 cfs/inch of runoff <br />= 8.8 cfs '~- 0.93 inch <br />Pond Design from Drawings <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 3 4 ft 2 ft <br />Q=A ~ R3S2 <br />Q = (oft * 2ft)(0.017)(4+2+2ftft)3(0.02)' <br />Q = (BftZ}(88.235)(1)(0.141) <br />Q = 99.5 cfs <br />Summary <br />1. Pond volume <br />Oftine Emergency Overflow 0.003 acre ft(dav = 1000 pal/day <br />~-~~ <br />i•later = 0.28 acre ft <br />Sediment = 0.15 acre ft = 0.035 acft/acre * 4.22 acre <br />a 5(33 <br />Total vnl~~me nPaded = 8:-4-3 acre ft <br />© Designed for 0.65 acre ft <br />ould take 73 days of emergencv outflow <br />2. Peak flow in emergency spi11~7~ for discharge. <br />Peak discharge capacity needed = 8.8 cfs <br />Designed for = 99.5 cfs <br />occur <br />