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Ground Water Drawdown Test Calculations <br /> West Clay Properties <br /> 639 West Clay Street, Stockton, California <br /> 5 GPM <br /> Q = 5.0 GPM; As = 1.5 ft.; t= 285 minute; r = 81 ft. <br /> T = 70Q—As -4 70(5 0 GPM) — 1 5 ft=230 ft2/day <br /> 230 ft2/day x 1 gpd/ft— 0 134 f/day= 1,740 gpd/ft <br /> S =T(t) — 640 (ra) = (230 ft2/day)(285 min) — (640)(81) = 0.016 <br /> K=T —b = 1,740 gpd/ft--20 feet= 87 ft/day <br /> 87 ftlday(1 cm/sec/2835 ft/day) =0.031 cm/sec <br /> 6 GPM <br /> r <br /> Q = 6.0 GPM; As = 1.8 ft.; t=465 minute; ro = 82 ft. <br /> T = 70Q—Os -4 70(6 0 GPM)— 1 8 ft=230 ft/day <br /> 230 <br /> 230 ft2/day x 1 gpd/ft— 0 134 ft2/day= 1,740 gpd/ft <br /> S = T(t)— 640 (rQ) = (230 fl/day)(465 min) --- (640)(82)2 = 0.026 <br /> K=T —b = 1 740d/ft—20 feet= 87 ft/day <br /> Y <br /> 87 ft/day(1 cm/sec/2835 ft/day) =0.031 cm/sec <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br />