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<br />Artificial Recharge of Ground Water in Cotorado <br />A Statewide Assessment <br /> <br />fluid, with density and temperature affecting the viscosity of water. The hydraulic conductivity <br />of earth materials varies by several orders of magnitude. Unconsolidated sand and gravel <br />aquifers as well as cavernous carbonate rocks have values of 100 to 10,000 feet per day, while <br />values in consolidated sandstone aquifers may range from 0.1 to 0.000 I feet per day. Thus for <br />recharge project considerations, hydraulic conductivity represents the volume of water that will <br />move through a unit area in a unit time under a unit hydraulic gradient. The hydraulic gradient is <br />the driving force for ground-water movement. The timeframe and amount of water transmitted <br />between an area of recharge and the area of discharge will be dependent upon the hydraulic <br />conductivity and gradient of the aquifer. <br /> <br />Application of AR Technolol!ies to Colorado Aquifers <br />Section 111 describes technologies used for AR and provides Colorado examples for each <br />technology where identified in the AR inventory. This section describes which technology <br />would be appropriate for each of the aquifer systems evaluated. <br /> <br />Table VII-tlists the general aquifer systems in Colorado along with possible AR technologies <br />that could be applied in those aquifer systems. Included are general considerations that should <br />be addressed before any detailed evaluation of particular technologies can be made. Detailed <br />design of an AR application is highly site specific and cannot be made until a proposed AR site <br />has been thoroughly characterized; therefore, this section provides very general guidelines <br />regarding applications of technologies to the aquifers. <br /> <br />Table VII-I. <br />Applicable Technologies for Colorado Aquifers <br /> <br />t <br />t <br />t <br />t <br />41 <br />41 <br />41 <br />41 <br />41 <br />4 <br />4 <br />4 <br />4 <br />4 <br />4 <br />4 <br />. <br />. <br />4 <br />4 <br />4 <br />4 <br />4 <br />4 <br />4 <br />4 <br />4 <br />4 <br />4 <br />4 <br />l <br />I <br />I <br /> <br />Aquifer System Technology Considerations <br />Unconsolidated . Surface Infiltration . Project objectives <br />Sedimentary Aquifers . Subsurface Infiltration . Available land area and land-use <br /> . Direct 1njection/ASR . Presencelabsence of impervious layers <br /> . Detention dams . Depth and aerial extent of aquifer <br /> . Ground water dams <br />Consolidated . Surface Infiltration . Project objectives <br />Sedimentary Aquifers . Direct Injection/ASR . Available land area and land-use <br /> . Stratigraphy <br /> . Outcrop characteristics <br />Fractured Bedrock . Surface Infiltration . Project objectives <br />Aquifers . Subsurface Infiltration . Available land area and land-use <br /> . Outcrop characteristics <br />Carbonate Aquifers . Natural Openings . Project objectives <br /> . Direct Injection/ASR . Outcrop characteristics <br /> . Stratigraphy <br />Abandoned Mines . Adits/Shafts . Project objectives <br /> . Direct 1njection/ASR . Mine characteristics <br /> <br />60 <br />