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beak <br /> <br />25yr -- 24 hr = 0.65 inches <br />5. Determine peak discharge of runoff CN85 (Pp18 - FIG. S-lA, SCS) <br />25yr -- 24 hr = 14.5 cfs/inch of runoff <br />= 9.4 cfs ` 0.65 inches <br />Design from Drawi <br />1. Pond volume <br />Principal Spillway = 0.77 acre ft <br />Emergency Spillway = 0.96 acre ft <br />• <br />2. Peak flow of Emergency Spillway - i <br />~~~ <br />4=A1~5RzSZ <br />z <br />Q = ~n(1.5ft)z~~0.017~ ~~91425ft ~ I0.015~~z <br />z <br />Q =7.069 ft ~~88.235~111.75ft~~0.122~ <br />Q = 57.3 cfs <br />Summary <br />1. Pond volume <br />Needs 0.34 acre ft water volume <br />Needs 0.25 acre ft = 0.035 acre ft/acre x 7.21 acre <br />Needs 0.59 acre ft total volume <br />Designed for 0.77 acre feet <br />I <br />