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SCHOELL a MAOSOIM, INC. ^Xf4 . K, <br />DRAINAGE CALCULATIONS <br />FIEBELKORN POOL PROJECT <br />2730 SHADYWOOO ROAD <br />Drainage Concept; <br />To mitigate the effect on storm runoff of the additional Impervious surface <br />area of the shimming pool and adjacent patio, the pool would be utilized as <br />a detention basin with the patio areas sloped to drain runoff Into the <br />pool. An overflow from the pool would drain the runoff Into a soil <br />absorption water disposal system. <br />Impervious Surface Area; <br />Pool <br />Spa <br />Adjacent Pctlo <br />736 square feet <br />33 <br />1040 <br />1809 square feet <br />Required Detention Storage Volume In Pool: <br />Use SCS Method, 100 year frequency, 24 hot* <br />From Fig. 1-8, Rainfall ■ 5.9 In. <br />Use SCS Curve No. 98, From Table 3-3 Runoff - , <br />Detention Volume » 1809 square feet x 5.67 In. » 855 ft!^ <br />■orm <br />5.67 In. <br />12 In/ft <br />Storage Volume Available <br />Pool S Spa <br />11 Inches freeboard (filter outlet to patio level) <br />Volume - 736 square feet » 33 square ft. x 11 In. <br />TTTnTTt. <br />675 ft. <br />J <br />>■ <br />Assume flooding patio area (no overflow) <br />Maximum depth on patio - 2 In., avg. depth - 1 In. <br />Additional depth over pool <br />Volume (patio) *1040 s.f. X 1 In. »86 ft.' <br />12 In/ft <br />Volume (pool) ■736 s.f. X 2 In. * <br />12 In/ft <br />122 ft.J <br />Total 883 ft? <br />Final design of soil absorption water disposal system will require soil borings <br />and percolation tests to determine absorption rates.