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schoell &madson .inc . < <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 swimming 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 Patio <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 hour storm <br />From Fig. 1-8, Ralnf?’’ » 5.9 In. <br />Use SCS Curve No. 98 »*om Table 3-3 Runoff * 5.67 In. <br />Detention Volume * i,., square feet x 5.67 In.855 ft? <br />12 in/ft <br />Storage Volume Available <br />Pool 4 Spa <br />11 Inches freeboard (filter outlet to patio level) <br />Volume “736 square feet » 33 square ft. x 11 In. <br />12 In/ft. <br />Assume flooding patio area (no overflow) <br />Maximum depth on patio - 2 In., avg. depth - 1 In. <br />675 ft. <br />y <br />•V 0 • <br />Additional depth over pool <br />Volume (patio) ■ 1040 s.f. x 1 In. * <br />12 in/ft <br />Volume (pool) = 736 s.f. x 2 In. * <br />12 in/ft <br />Total <br />86 <br />22 ft.C^ <br />883 ftr <br />Final design of soil absorption water disposal system will require soil borings <br />and percolation tests to determine absorption rates.