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Design Storm Peak Storage Time Maximum Storage Volume (Ft3/AC) <br /> � (Minutes) <br /> 10 YR T = -25 , 2254 V = 3607T - 40 QoT <br /> -� s �- <br /> I <br /> 23 YR T =-23 + 2706 V = 4329T - 40 Qo T <br /> � _ . ._ . _ __ � �_ <br /> S .__� _ J <br /> 30 YR T ��20 + 2160 V = 4329T - 40 QoT <br /> �o s -'I`+F6 <br /> 100 YR T �-20 + 2�43_0 VS = 4E�aT - 40 QoT <br /> How to use tables , <br /> Example: Qallow = 0.9 cis <br /> Deaisn Storm ■ 23 Yr. <br /> A . !0 �aes , <br /> � �' Cdev ` 0.9 <br /> Qo = ( allow) = 0.9 = 0.1 <br /> A C�� l0 .9 <br /> T = -23� 706 = 139.5 <br /> 0.! <br /> Vs = 4329 (139.3? - 40(0.1)(139.3) _ <br /> 139.3 � 25 <br /> , VS = 3113 cf/acre impervious <br /> . <br /> �� �� <br /> 1 T4G/G �. �a ,. � <br /> �./ <br />