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Trepanier Engineering <br />Professional Civil Engineering <br />February 22, 1989 'EFEB <br />JOB NO. 89-010 <br />2.3 19b9 <br />DRAINAGE CALCULAT?ONS ..................... ............. <br />FOR CITY at, EVERETT. <br />PLAT P ELECTRIC SUPPLY Public Works Dept. <br />DRAINAGE BASIN: <br />Combined sewer outside downtown <br />10 year pre -development = 10 year post development �)K <br />0.55 Acres; S = 1.02% (Avg.) Ok <br />Qcx = (0.31 cfs/Ac) (0.55 Ac) <br />= 0.17 cfs <br />STORAGE REQUIRED (TABLE 6 - IMPERVIOUS) <br />= (2614 cf/Ac) (0.55 Ac) <br />= 1437 cu. ft. of storage <br />6d RP <br />R-lad mv 0,31 Cfslev_,. <br />Ih�p.— I/34 Gf�ac. a <br />(634 Cf��l(O,SSR�, 89c�•7CF. <br />Coor9ma NJr <br />(2,s8� <br />'t23I8�-5 <br />/a7o0,0L <br />3- ►-e2 <br />1420 Hewitt 9 Everett, Washington 98201 • Everett (206) 259.5556 <br />