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Artificial Recharge of Ground Water in Colorado <br />A Statewide Assessment <br />INJECTION WELL/ HORIZONTAL <br />"ASR" WELL WELL <br />Note: Alternatively, the pump column, equiped with a down -hole flow control valve, can serve as the injection pipe. <br />Potentiometric <br />surface <br />Confining <br />layer <br />Confined <br />aquifer 1 <br />Confining <br />layer <br />Confined <br />aquifer 2 <br />Base of <br />confined <br />aquifer <br />Figure IV -4. Direct injection in a confined aquifer. Water for recharge is injected through a well directly into a confined aquifer raising the potentiometric surface <br />around the well. The well can also be used for recovery of the injected water as an ASR well. Injection can use a dedicated injection pipe or the pump column <br />equipped with a down -hole flow control valve. A horizontal well increases the area of the well open to the aquifer and can potentially increase well yields and /or <br />injection rates. <br />21 <br />