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� <br />' - . <br /> I ' <br /> ��. — <br /> W . E . CRANE & ASSOCIATES , INC . <br /> • ENGINEERS Phoo. EL3-1119 <br /> S U R V E Y O R S 9800 Hi9hwey 99 <br /> •F _ V�f DOd�aCd ��`��� S�� Everett, Weshington <br /> ��e <br /> April 8� 1969 <br /> HANK OF EVEHETT RUNOFF <br /> Decipn <br /> i = 1�5 10 year frequency <br /> t+20 <br /> d <br /> i = 105 = 1�5 = 2.44 in�hr <br /> t+2o 43 <br /> Reports <br /> ql = �Aci <br /> o = (18.4)(�•5)�z•44) = 22.5 cfs <br /> From ldanninga <br /> Meps Using Q = 22.5 cfs S1 = 3f the pipe size rec;uired would be <br /> 21�� V = 10.8 Fpe <br /> 0 <br /> \ Time of flow MH�� 1 to Id1i�# 2 <br /> �:�wivi- <br /> sionc t = 23•J min <br /> � <br /> '� � Ac = (iF3.41(0.5) + 2.2 = 1i.4 <br /> � i = 105 2.4 in�hr <br /> 43.5 <br /> � Lot @2 = 11.4 (2•4) = 27.6 cfe <br /> Survayc D = 21'� C4� 3p <br /> PR�ES 0 � <br /> G a�0 of WaSh�Gry�i - <br /> 5 �� <br /> I � � I % <br /> , / / _ i � <br /> � . i.,r � --_ <br /> :L�. � � � �J--.ti-r� <br /> o.n6sq°�,..,,n���a`��� <br /> 5���'c;.l. �� � <br /> L`�pY� <br /> I <br />