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Trepimia Engineering <br />Professional Civil Engineering <br />July 29, 1988 <br />JOB NO. 88-018 <br />DRAINAGE CALCULATIONS <br />FOR <br />A & W ROOTBEER BOTTLING COMPANY <br />DRAINAGE BASIN: MERRIL & RING CREEK <br />STORM DESIGN: <br />10 YEAR PRE -DEVELOPMENT <br />25 YEAR POOST-DEVELOPMENT Ok <br />A = 2.913 Ac; 1=500'; S=11.0% <br />ALLOWABLE RELEASE RATE = 0.271 cfs/Ac <br />Ok <br />POST DEVELOPMENT: <br />AREA IMPERVIOUS = 2.687 Ac <br />AREA PERVIOUS = 0.226 Ac <br />FROM. TABLE 7, THE DETENTION REQUIREMENT FOR THE HYDROSEED AREA AND <br />IMPERVIOUS AREA IS 381 cf/Ac AND 2548 cf/Ac. Respectively <br />Ok o% <br />TOTAL DETENTION: <br />(2.687 Ac) (2548 cf/Ac) + (0.226 Ac.) (381 cf/Ac) <br />- 6933 CUBIC FEET Ok <br />3201 Broadway • Suite E 9 Everett, Washington 98201 9 Everett 1206) 259-5556 <br />