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<br />ArtificiAl Recharge of Ground Waler in Colorado <br />A Slatewide Assessment <br /> <br />, <br /> <br />SOIL AQUIFER TREATMENT <br /> <br />I <br /> <br />E_traction <br />W...11 <br /> <br />I <br /> <br />METHOD A: Geopurlflc..tlon through the uns.-turated zone <br /> <br /> <br />I <br /> <br />W"l...r <br />labl... <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />METHOD B: Geopurlflcatlon through the ...turated zone <br /> <br />[xu"Cllon <br />w..1l <br /> <br />Injectlon <br />W..ll <br /> <br />I <br /> <br />W6tl!' <br />lable <br />.JI: <br /> <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Figure 111.5. Schematic diagram illustrating two mechanisms of soil aquifer treatment. <br /> <br />I <br /> <br />Restorl'/Protecr Alluifers <br />Unless mitigated. excessive ground-water extraction can decrease the usefulness of an aqui fer <br />over time due to \...ater-Icvcl declines. AR can maintain the long-tenn viability of an aquifer: <br /> <br />I <br /> <br />. Restoring ground-water lne/s - Recharging more water than is recovered can <br />reverse. or stabilize. water-level declines. The primary result of ground-water <br />extraction at rates exceeding natural recharge is widespread water-Ievcl decline in the <br />aquifer. AR can reverse or stabilize this trend. Figure 111.6:1 Ihru c compares the <br />hydrographs of an ASR well. observation well, and nearby production \vcll in the <br />Den....er Basin where a regional water-level decline is evident. Frequent recharge <br />cycles at the injection well offset the regional decline trend. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />13 <br /> <br />I <br />