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��ro <br />� <br />p 6 <br />C H <br />b H N <br />M � Z <br />K � n <br />H � <br />ro .�i a <br />y 1-i <br />� O � <br />� H O <br />�c�a°o <br />n• � <br />Y H � <br />t� N H <br />O N <br />O H <br />n O N <br />� � CrC <br />2 H N <br />H O m <br />Uate �.,8� <br />CITY OF EVERETT PUBLIC WORKS <br />DRAINAGE CALCI.�LATION SUBMISSION FORM <br />Project Name: Waterfront Substation <br />Project Location: � �i' �riva <br />Drainage Basin: Combined Sewer Outside Downtown <br />Pre-Development Design Storm (yr): 10 Year <br />Post-Development Design Storm iyr): 10 Year _ <br />Area of Site (acj: 59 acres <br />Existing Slope of Site (%): � �q �0%+ __ <br />Existing Ground Cover <br />Woods/Forest (ar_) .11, 2%; .15, 7% <br />Lawns/�andscaping (a� ._��q� <br />Earth/Gravel (ac): .1, ZY�-' <br />Impervious (ac): p,�,�n7 20% <br />Existing Run-Off (cfs) Zt/ tc�,. �SI ��91+ 1(.311+.1(.72)+ .06(1.3°)+ <br />per acre ��� 501 = .3385 ; .5'J = .5737 cf5/atre <br />Proposed Ground ��ver <br />Lawns/Landscaping (ac): .21 acres <br />Earth/Gravel (ac): e , <br />Impervious (ac): — acres <br />Detention Storage Required (cf/ac) <br />Lawns/Landscaping (cf/ac): <br />Earth/Gravel (cf/ac): <br />Impervious (cf/ac): 5 <br />Total Detention Storage Required <br />Lawns/Landscaping (cf): N/A <br />Earth/Gravel (cf): <br />Impervious (cf): . _ �. cf <br />Total Storage Require c 15.7___r_ cf <br />, ., , ,.i . <br />