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MURPHY WELDING COMPANY <br />3426 Oakes Street <br />City of Everett <br />Storm DrainDrainave Calculations: <br />i Total parcel size: 6,000 S.F. 0.14 Acres <br />i <br />Existing Ground Cover: <br />Light ground cover over 85% of the area. Homes, shops and sidewalks occupy the <br />remaining 15%. Existing ground slope -5% <br />Proposed Ground Cover: <br />Landscaping areas of 25% of the parcel with parking and apartments to be constructed <br />over the remaining 75%. Propose ground slope G 5% <br />Parcel is within the 'combined sewer outside downtown" design basin <br />:. calculations are for design stonn as follows: (See Table 1) <br />Pre -development 10 year <br />Post -development 10 year <br />Pre -Development Calculations: <br />A. Impervious area = 0.140 acres x .15 = <br />0.021 Ac <br />Peak runoff (See Table 5 10 yr @. 5.0% slope) = <br />1.40 cfs/Ac <br />Peak rate of runoff = 0.021 x 1.40 = <br />0.029 cfs <br />Landscaped area = 0.14 Ac x 0.85 = <br />0.119 Ac <br />B. Peak runoff (see Table 3 10 yr @ 5.0% slope) = <br />0.41 cfs/Ac <br />Peak rate of runoff = 0.119 x 0.41 = <br />0.049 cfs <br />Total Pre -development Peak Rate of Runoff <br />= 0.029 cfs + 0.049 cfs <br />