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\~ DESIGN VOLUMES FOR #9 PONDS <br />Q 290 gpm <br />290 x 4.2 X 10-3 A-F/d = 1.28 AF/d <br />9Pm <br />Provide far 10 days retention <br />1.28 x 10 = 12.8 A-F <br />This is total for 4-P1 P2, P3 <br />Add 10-year rainfall runoff volume <br />Assume all undisturbed tributary area <br />CN=69 <br />10-year rainfall 1.5" <br />10-year runoff 0.07" <br />Pond Area Volume <br />Gres) 7~ <br />9 P1 6.5 .04 <br />9 P2 18.7 .11 <br />5.9 .03 <br />9 P3 12.1 .07 <br />0.25 A-F <br />Total Volume = 13.0 A-F <br />~ .. <br />-23- <br />