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Capture Zone calculations <br /> Tri Valley Growers-Thornton <br /> Assuming Q - 1 liter/minute (pumping rats) - 50.85 ft3/day <br /> b n 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 /> d - 0.20 (estimated effective porosity) <br /> Vn - natural velocity of groundwater <br /> Vp - pumping velocity of groundwater ^i <br /> rc - radius of capture <br /> Vn - Ti/b0( Vp - 0/2„r rbcY <br /> The capture zone limit in the downgradient direction <br /> occurs @ radius r where Vn - Vp <br /> Ti/bCf A 0/2 rb(Y or rc - Q/21r Ti <br /> rc 91.55 ft. <br />