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<br />'OO'06n.9 <br /> <br />. <br /> <br />. <br /> <br />Following completion of this study a more vigorous analysis was made by <br /> <br />simulating the area with a digital model. Two alternate plans of ground <br /> <br />water withdrawals were considered. The first plan withdrew 840,000 <br />acre-feet annually from 378 wells with the northern salvage areas producing <br />more water and decreasing the pumpage in the southern areas. The pre- <br /> <br />dicted drawdowns were small in comparison with the thickness of sat.urated <br /> <br /> <br />deposits in the area. The second analysis withdrew the same amount. of <br /> <br /> <br />water from 100 wells whose yield was designed in proportion to loc~l <br /> <br /> <br />aquifer transmissivity. The studies indicated that both arrangements <br /> <br />were superior to the Bureau's layout presented in the house document, <br /> <br /> <br />however, the GS recognized that the Bureau's original design may not be <br /> <br /> <br />the best layout and indicated that the salvage project would be developed <br /> <br /> <br />in stages and that the original well layout should be as field conditions <br /> <br /> <br />dictated. <br /> <br />Results from additional model testing in 1971, in which four cases of <br /> <br /> <br />project operation we~e tested, indicated (1) that the project proposal <br /> <br /> <br />is feasible with water salvage, (2) that the river will not be signifi- <br /> <br /> <br />cantly depleted by withdrawals from wells, (3) that more water can be <br /> <br /> <br />salvaged by using larger well fields, and (4) that the well fields <br /> <br /> <br />should be designed with withdrawals made proportional to local trans- <br /> <br /> <br />missivity. The digital studies essentially confirmed the analog sl,udies. <br /> <br />The study considered four pumping arrangements with varying stress'ls <br /> <br /> <br />being simulated. In case 4 the well field was redesigned so that 11ell <br /> <br /> <br />discharge rates were proportional to the aquifer transmisSivity in,the <br /> <br />7 <br />