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<br />, UU1,-Uil <br /> <br />.... <br /> <br />1. Development <br /> <br />The project is scheduled for stage development over a 10-year period. Water <br />production information from each stage will be used to determine well field <br />designs and yield projections for the following stage. Therefore, the exact <br />amount of ground water that can be pumped is not known at this time; however, <br />an estimated 66,000 to 104,000 acre-feet of ground water is projected to be <br />pumped annually. with an average of about 100,600 acre-feet per year being <br />the pumped yield objective. Of this 100,600 acre-feet of water, 4,500 acre-feet <br />will be delivered to the existing Alamosa NWR, 800 acre-feet will be delivered <br />to the existing Blanca Wildlife Habitat Area, about 5,500 acre-feet will be <br />lost (evaporation and maintenance losses), and the remaining 89,800 acre-feet <br />will be delivered to the Rio Grande annually. <br /> <br />2. Operation <br /> <br />Pumping operations of the unconfined aquifer would be carried on throughout the , <br />entire year and would maintain the ground water levels at or below 8 feet from ~ <br />the ground surface within most of the project area. Well fields will be designed <br />and pumping rate adjusted so that the water table outside the project area will " <br />not be drawn down more than two feet below existing water table levels. A system G <br />of observation wells outside, around the perimeter of, and within the project areat: <br />will monitor drawdown. With full development, the project will deliver flows <br />ranging from 80 cubic feet per second (ft 3/s) to 160 ft 3/s (maximum capacity <br />of the conveyance channel) of water to the Rio Grande. <br /> <br />Well fields will be developed in four stages. Data from previous investigations <br />and current ground water studies indicate that from 95 to 165 wells will be <br />required to pump from 66.000 to 104,000 acre-feet from the shallow, uncon- <br />fined aquifer in the project area (see the following tabulation). Wells will be <br />spaced from 0.5 to 1.5 miles apart. Individual wells are expected to yield water ~ <br />at rates varying from 0.5 to 2 ft 3/s. <br /> <br />- <br /> <br /> Number of Well Estimated ground <br /> Production Capacities water yield <br />Stage Well s (ft 3/s) (acre-feet/yr) <br />1-2 30 to 55 0.5 to 2 13,000 to 23,000 r; <br />3 25 to 40 0.5 to 2 22,000 to 30,000 <br />4 25 to 40 0.5 to 2 25,000 to 37,000 ~ <br />5 lito~ . 0.5 to 1 6,000 to 14.000 <br />Tota 1 95 to 165 66,000 to 104,000 <br /> <br />Well field laterals (all buried pipelines) will collect and deliver the pumped <br />ground water to the open conveyance channel. Usually, small laterals will collect <br />the discharges of several wells and deliver the combined flows to the conveyance ' <br />channel. These laterals will total about 100 miles in length and range in <br />capacity from 0.6 ft3/s to 10 ft3/s, depending on the number of wells on each <br />lateral and their combined yield. The designs of the laterals are based <br />on capacities equal to 110 percent of the normal discharges of the wells tributary <br />to the laterals. The laterals will discharge into the conveyance channel through <br />concrete transition structures. <br /> <br />2 <br />