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In the presence of natural groundwater flow- <br /> The symmetrical UVB circulation flow is deformed <br /> A portion of the water entering the lower screen circulates <br /> thru the UVB repeatedly and the remainder of the water <br /> flows through the well only once <br /> • Design of the UVB must ensure that a single pass though <br /> the well results in acceptable clean-up of the water <br /> Va <br /> Vb <br /> t <br /> VC <br /> Y <br /> 1 <br /> UVB Circulation Flow in the Presence of Natural <br /> Groundwater Flow <br /> Va: Vb: Vc = 0. 0 3 : 1 .0 <br />