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<br />,_. ,0.00607 <br /> <br />. <br /> <br />. <br /> <br />the A1amosa National Wildlife Refuge near Alamosa. The plan provides <br /> <br /> <br />for stage development of the water salvage features to assure that pumping <br /> <br /> <br />from the shallOl,/ ground water does not adversely affect ground watE:r <br /> <br /> <br />conditions in die valley. A .comprehensive system of observation WEllls will <br /> <br /> <br />be developed in both the shallow and artesian aquifers to monitor the effect <br /> <br /> <br />of the project on those aquifers. <br /> <br />Following completion of the Regiona1.Director's report, the Geological <br /> <br /> <br />Survey (GS) constructed an electric analog model of the water salvage <br /> <br /> <br />plan as presented in House Document No. 91-369, Results of this study <br /> <br /> <br />were published as Colorado Ground Water Circular No. 14. The analog <br /> <br /> <br />model was constructed as part of a water resources appraisal study of <br /> <br /> <br />the San Luis Valley. It synthesized the hydrology of the valley and <br /> <br /> <br />predicted the effects of changes in the water management. The report <br /> <br /> <br />predicted excessive decline of ground water levels after a 50 year <br /> <br />period of operation with the feasibility design for well field layouts. <br />The transmissivity of, the aquifer was estimated from aquifer performance <br />tests and specific capacity tests. The model also predicted the aerial <br />distribution and magnitude of decline throughout the Closed Basin. <br />Because the depth to ground water averages only 2-1/2 feet in salvage <br />areas 2, 3, and 4, the potential for salvage water is much higher in <br /> <br />those areas than in salvage areas 5 and 6 where the water depth is much <br /> <br /> <br />greater. Stage 1 development is entirely within salvage area 6. The <br /> <br /> <br />model also pred:l.cted that after about 10 ,years of pumping equilibrium <br /> <br /> <br />between pump withdrawals and water formerly discharged by evapotrans- <br /> <br /> <br />piration, will tie achieved in the area. The model predicted that ~ <br /> <br /> <br />5 <br /> <br />. <br />