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i_ <br /> N <br /> capture Zone C:aXculdtio:.s <br /> Tri Valley Growers-Thornton <br /> Assuming Q 1 liter/minute (pumping rate) - 50.85 ft3/day <br /> b - 10 ft (saturated thickness of aquifer) <br /> T - 196 gallons/day/ft (transmissivity from pumping test) <br /> i - 0.0034 ft/ft (hydraulic gradient from monitoring data) <br /> 0 - 0.20 (estimated effective porosity) <br /> Vn = natural velocity of groundwater <br /> Vp - pumping velocity of groundwater <br /> rc - radius of capture <br /> Vn - Ti/b(Y Vp - Q/2n rbo' <br /> The capture zone limit in the downgradient direction <br /> occurs @ radius r where Vn = Vp <br /> Ti/bo` = Q/2 rbU or r4 = Q/2r Ti <br /> rc 91.55 ft. <br /> f <br />