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� CITY OF EVERETT PUBLiC WORKS <br /> DRAINAGE CALCULATION SUBMISSION FORM <br /> Date: March 18, 2002 <br /> Project Name: Nhitfialds Znsuranca <br /> Project Location: 3417 eroadvap <br /> Submitted By: Cascad� Suzv�yinq i Lrnq, inc. <br /> Drainage Basin: 36th Street Combined <br /> Pre-Development Design Storm (yr) : 10 year <br /> Post-Development Design Storm (yr) : 10 year <br /> Area of Site (ac) : 0.48 Acras <br /> Existing Slope of Site ($) : LaMne-7.59 Graval-9.39 imparvioua-2.28 <br /> Existing Ground Cover <br />` Woods/Forest(ac) : 0 1►cr�s <br /> lawns/landscaping(ac) : 0.19 1►cres <br /> Earth/Gravel (ac) : 0.037 ]►crea <br /> Impervious (ac) : 0.253 Acree <br /> Existing Run-Off(cfs) : 0.�566 c.f.s. <br /> per acre: 0.95 c.f.s./1►cre <br /> Proposed Ground Cover <br /> lawns/landscaping ac: 0.02 ]lcrea or 49 of site <br /> Earth/Grave; (ac) : N/11 <br /> Impervious (ac) : 0.�6 or 96� of site <br /> Detention Storage Required (cf/ac) <br /> Lawns/Landscaping (cf/ac) : 8�3 cf/ac <br /> Earth/Gravel (cf/ac) : N/11 <br /> impervious (cf/ac) : 28 cf/ac <br /> Total Detention Storage Required <br /> lawns/landscaping(cf) : 17 ef <br /> Earth/Gravel (cf) : N/11 <br /> Impervious (cf) : 13 ef <br /> Total Storage Required(cf) : 30 c.f. <br /> � <br />