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6 of l0 <br /> Design Storm Pcak SSoragc Time �taximum Storagc Volume (Pt3/AC) <br /> (�1inutes) <br /> 10 YR T = -25 + 2254 i V = 3G07T - 40 QoT <br /> a 5 T+25 <br /> 25 Y2 T =-25 + 270G V = 4329T - 40 Qo T <br /> ( o- 5 T+25 <br /> 50 1'R T =-20 � 215C V , yg�oT _ yp �,o-r <br /> Qo 5 "I'+20 <br /> 100 YR I T =-20 + 2 33 0 VS = 4S60T - 40 QoT <br /> IJ �� T<<� <br /> How to use table: <br /> EKample: Qallow = 0.9 cis <br /> Design Storm = 25 Yr. • <br /> A = 10 acres <br /> Cdev = 0.9 <br /> Qo = (Qallow) = 0.9 = 0.1 <br /> (A)(Cdev UO)(.9) <br /> T = -25+ 2706 = 139.5 <br /> � 0.1 <br /> V = 4329 (139.5) - 40(O.l)(139.5) _ <br /> 5 139.5 + 25 <br /> VS = 3113 cf/acre impervious <br /> - Tu��� z. <br />