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��� <br /> .'.'.:�L��'.. <br /> � � ' . .. . _ .�v. <br /> j � . . .1r... <br /> � A�. <br /> — . r��+�Y+s�n�J..�.�.v . � �.�......nr+�� .,, <br /> . . . . ... �P�w�AAYN.�TI.. <br /> � Tr¢pani�r En������in� <br /> Professional Civil Engineering <br /> October 17, 1988 <br /> JOB #88-075 <br /> DRAINAGE CALCULATIONS <br /> POR <br /> EVERETT DAY CARE <br /> STORAf P2SIGN NORTH CREEK BASIN <br /> 5 year Pre-development <br /> 25 year Post-devel.opment d'� <br /> Slope Less than 2% <br /> Ali.owable release rate <br /> 0. 72 cf/Ac � o,� �.o� x.b�J + �o.zi x.ss� _ ��i� <br /> Based upon 679 woods and forest and 33� lawns and landscaping. <br /> ,/D C{; �-v.�va!/' --l�,,:� ,2"'.J.fl, oa.FCF_ <br /> POST DEVELOPh1ENT <br /> Lawn/L�ndscape .11 Ac <br /> Area Impervieus .75 Ac <br /> From Table 7 the retention required for Landscaped and Impervious area, <br /> respectively <br /> o�' p� <br /> (0.11)(944) + (0.75)(4208) _ <br /> 104 + 3156 ���J,. , � ��,,,,,�.,,,, <br /> �' 0.�� ,�'� �E T P'= <br /> Total retention reuuired /�f��G ,(1_ ��';r._- � oF W+� � <br /> = 3260 cubic feet ���y'��� '� ;� �Z ''a`� <br /> � <br /> � <br /> � <br /> a �� <br /> a' �� <br /> P >' <br /> . 'i_�U 0 X Z, u` 7 '+. O,`FS ' S c� <br /> — '�p 378 �—n ;t`i�;; <br /> CONT2iBv7�U,t/ F'i;;.'c/�/>. <br /> .�a�o k���,Sy � �85��f 3 yo <br /> S s3-8ry <br /> ^ � 7420 Hewltt • Everatt,Washington 982D7 • Ever�tt(206)259-5556 <br /> � <br />