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10 yr -- 24 hr = 0.66 inches A = 4.21 acres <br />= 2.78 acre inch <br />• = 0.23 acre feet <br />25 yr -- 24 hr = 0.81 inches <br />5. Determine peak discharge of runoff CN88 (pp18 - Fig. S-lA, SCS) <br />25yr -- 24hr = 9.0 cfs/inch runoff <br />0.81 inches <br />= 7.3 cfs <br />Pond Design from WSC Description <br />1. Pond volume <br />Principal Spillway = 0.366 acre ft <br />Emergency Spillway = 0.463 acre ft <br />• 2. Peak flow capacity of Emergency Spillway <br />aft lft <br />Q = A 1_5 R2/3Sz <br />_ (lft * aft) (0.017) (1ft5ft3ft)2/3 (0.015)Z <br />_ (3ft)(88.235)(0.711)(0.122) <br />= 23.1 cfs <br />3. Freeboard <br />= 0.87ft <br />H = (~3L-)2/3 = (3 3ft3/S 2/3 <br />Summary <br />1. Pond volume <br />Needs 0.23 acre ft water volume <br />• Needs 0.14 acre ft = 0.035 acre ft/acre * 4.83 acres <br />Needs 0.37 acre ft total volume <br />Designed for 0.37 acre ft <br />