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<br />! . <br />u <br />-- <br />III <br /> <br />I <br /> <br />III <br /> <br /> <br />QO <br />;-:,.) <br />,:::J <br />c-' <br />c) <br />C~ <br /> <br />water table outside the project area will not be drawn down more than <br />2 feet below existing water table levels. A~system of observation wells <br />outside, around the perimeter of, and within the project area will monitor <br />drawdown. With full development, the project will deliver flows ranging <br />from 80 cubic feet per second (ft3/s) to 160 ft3/s (maximum capacity of <br />the conveyance channel) of water to the Rio Grande. <br />, . <br /> <br />(1) Wells--Well fields will be developed in four stages. <br />Data from previous investigations and current ground water studies <br />indicate that from 95 to 165 wells will be required to pump from 66,000 <br />to 104,000 acre-feet from the shallow, unconfined aquifer in the project <br />area (see the following~abulation). Wells will be spaced from 0.5 to <br />, -. <br />1.5 miles apart. Indivl~ual wells are expected to yield water at rates <br />varying from 0.5 to 2 ft Is. <br /> <br /> Number of Hell Estimated ground <br /> Production Capacities water yield 11 <br />Stage IVells (ft3/s) (acre-feet/yr) <br />1-2 ]j 30 to 55 0.5 to 2 13,000 to 23,000 <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 15 to 30 0.5 to 1 6,000 to 14,000 31 <br />Total 95 to 165 66,000 to 104,000 <br /> <br />1/ <br /> <br />A yield objective is to approach 100,600 acre-feet per year (ac-ft/yr) <br />near to the 100,800 ac-ft!yr objective presented in House Document <br />No. 91-369. <br />Because of similar characteristics, the original areas of <br />Stages 1 and 2 have been combined into one stage (Stage 1-2 <br />for unit construction purposes. <br />6,000 to 14,000 acre-feet per year of ground water yield from <br />Stage 5 includes the easterp segment of the proposed Mishak NWR. <br /> <br />1.1 <br /> <br />1/ <br /> <br />The exact number and spacing of wells will depend on unconfined aquifer <br />characteristics such as transmissivity (or transmissibility) storage <br />coefficient and aquifer thickness, yields of wells, and ground water <br />quality. These parameters and aquifer recharge will be more accurately <br />defined as additional aquifer pump testing and water availability <br />investigations are performed and as the project develops through the <br />various stages. General aquifer characteristics determined throughout <br />the project area were based on limited information from observation <br />wells (GS 1958), numerous exploration holes, and seven test wells. The <br />estimated number of production wells and their yield for each stage were <br />based on general aquifer characteristics determined from well studies to <br />date. Aquifer modeling studies by the Geological Survey (GS) are being <br />used to refine estimates. <br /> <br />A-7 <br /> <br />