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' !• • � , <br /> , �j ?;',2 �i/�li-d��Z/� <br /> �-. _ <br /> GENERAL TELEPHONE COMPANY OF THE NORTHWEST, INC. <br /> Office and Warehouse Builc�ing <br /> Compute Q = CAI <br /> Predevelopment Runoff <br /> C m 0.30 <br /> A m 5.d0 acras <br /> i � 1.2 inct.ee/hour <br /> l(1. 20) (5. /) ( 1, 2 inches/hour) = 1. 296 CFS <br /> Po��t d�.vel;pment Runoff <br /> C = U.90 <br /> A = 5.d0 aCIeB <br /> 7 � 1.2 incher/hour <br /> (0.90) (5.d) (1.2 inchee/hour) = 5. 832 CFS <br /> Nrede�elopment R�ynoff � 1.296 CFS <br /> Post development Runoff = 5. 832 CFS <br /> y:unoff due to development a d.536 CPS <br /> 4. 536cfe x 26 x 60 � 7076 feet3 <br /> Lag Time 100 feet3 <br /> Total required volume7176 feet3 <br /> . <br />