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<br />NEW MEXICO GEOLOGICAL SOCIETY- TWENTy-SECOND FIELD CONFERENCE
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<br />are recharged with water yielded from watersheds tributary
<br />to the closed basin aud from diverted Rio Grande water.
<br />Crop productions are good in part of the area, but gen-
<br />erally it results in high nonbeneficial water usage. Further-
<br />more, the soils in the waterlogged areas have become
<br />alkaline, and the ground water has become highly mineral-
<br />ized because of evaporative concentration of salts. A major
<br />part of the valley south and west of Alamosa, likewise, is
<br />waterlogged.
<br />Deliveries of water under the Rio Graude Compact with
<br />New Mexico and Texas have been deficient, accruing a
<br />deficit of 944,000 acre-feet by the end of 1967. Colorado
<br />has managed to improve the situation by making the re-
<br />quired deliveries in recent years and has reduced the defi-
<br />cit to approximately 830,000 acre-feet by the end of 1970.
<br />The U.S. Geological Survey, as part of its present study
<br />of the San Luis Valley, has constructed a multiaquifer
<br />electric analog model, simulating the upper 3,120 feet of
<br />valley fill. A single aquifer version of the model (Emery,
<br />1970) has been utilized to evaluate a water-salvage plan
<br />proposed by the U.S. Bureau of Reclamation (U.s. Bureau
<br />of Reclamation, 1963). When testing of the model is com-
<br />plete, it will be used for more complex aualyses related to
<br />water management.
<br />
<br />REFERENCES
<br />
<br />Emery, P. A., 1970, Electric analog model evalnation of a water-
<br />salvage plan, San Luis Valley, south-central Colorado: Colorado
<br />Water Conserv. Board Cire. 14, 11 p.
<br />
<br />Emery, P. A., Boettcher, A. J., Snipes, R. J.. and Mclntyre, H. [.,
<br />Jr., 1971, Hydrology of the San Lnis Valley, sonth-central Coro-
<br />rado: U.S. Geo!. Survey Hydro!. Inv. Atlas HA-381. [In press.]
<br />Gaca J. R., and Karig, D. K, 1966, Gravity Sllrvey in the San Luis
<br />Valley area, Colorado: U.S. GeoI. Survey open-file report, 21 p.
<br />Johnson, R. B., 1967. The great sand dunes of southern Colorado:
<br />Art. in U.s. Geo!. Survey Prof. Paper 575-C, CI77-CI83.
<br />Larsen, E. S., Jr., and Cross, Whitman, 1956, Geology and petrology
<br />of the San Juan region, southwestern Colorado: U.S. Geol. Survey
<br />Prof. Paper 258, 303 p.
<br />McConaghy, J. A., and Colburn, G. W., 1964, Records of wells in
<br />Colorado: Colorado 'Vater CaDserv. Board Basic-Data Release 17
<br />~~ . ,
<br />Powell, W. J., 1958, Ground-water resources of the San- Luis Valley,
<br />Colorado: U.S. Ceol. Survey Water-Supply Paper 1379, 284 p.
<br />Robinson, T. W., Jr., and Waite, H. A., 1938, Ground water in the
<br />San Luis Valley, Colorado, in Regional Plan., pt. 6, Upper Rio
<br />Grande: Washington, U.S. Govt. Printing Office, U.S. Natl. Re.
<br />sources Planning Comm., p. 226-267.
<br />Siebenthal, C. K, 1910, Geology and water resources of the San
<br />Luis Valley, Colorado: U.S. Geo!. Survey Water-Snpply Paper
<br />240, 128 p.
<br />Upson, J. E., 1939, Physiographic subdivisions of the San Luis Val- '
<br />ley, southern Colorado: Jour. Geology, v. 47, no. 7, p. 721-736.
<br />U.S. Bureau of Reclamation, 1963, Plan for development of Closed
<br />Basin Division, San Luis Valley project, Colorado: Amarillo, Tex.,
<br />V.S. Bur. Reclamation, Region 5, Project Plan. Rept., 87 p.
<br />Win?grad, 1. J., 1959, Ground-water conditions and geology of Sun-
<br />shme Valley and western Taos County, New Mexico: New Mexico
<br />State Engineer Office Tech. Rept., no. 12, 70 p.
<br />
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