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�. <br /> �] (� M <br /> ld W �y <br /> i0 tl C <br /> C H <br /> � � N CITY OF EVERETT PUBLIC WORKS <br /> � � DRAINAGE CALCULATION SUBMISSION FORM <br /> � � M �ate 19arch 25, 1991 <br /> t�u � � PiojeCt Name: Madison Elementarv Schoo] Addiriona <br /> � c�a Project Location: 616 Pecks Drive <br /> c� • <br /> � y Submitted By: Northwest Architectural Company <br /> H <br /> m <br /> H <br /> tl N <br /> � r NOTE: Drainage Basin: Pigeon Creek nl <br /> � Calculations for �;,� <br /> � N ne�.� impervious Pre-Development Design Storm (yr) : 10 vears <br /> areas. <br /> Post-Development Desian Storm (yr): 25 vears �'•� _ <br /> Area of Site (ac): 0.34 �� <br /> Existing Slope of Site (A): < zx °� .--- <br /> Existing Ground Cover <br /> Waods/Forest ��c): <br /> Lawns/Landscaping (ac : 0.34 c<: <br /> i.. Earth/Gravel (ac): <br /> C�, Impervious (ac): <br /> Existing Run-OfP (cfs): 0.31 �< <br /> � � per acre <br /> � <br /> ��� <br /> Proposed Ground Cover <br /> Lawns/Landscaping (ac): <br /> � Eari:h/Gravel (ac): � <br /> { �� Impervious (ac): .34 0� � <br /> I <br /> Detention Storage Required (cf/ac) <br /> ��1�� Lawns/Landscaping (cf/ac): <br /> Earth/Gravel (cf/ac): <br /> Impervious (cf/ac): '2289 0� <br /> J� �1 1 Total Detention Storage Required � <br /> Lawns/Landscaping (cf): <br /> Earth/Gravel (cf): _ <br /> =1r' Impervious (cf): <br /> Total Storage Required c 778 ��•� <br /> -778 c.F. x �2,69/cf -�'o9z . �;'L <br /> ����� <br />