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G. INVESTIGATIONS The Fiscal Year 1991 budget for the planning program is about $2.6 million, with about 80 percent being directed within the Upper Colorado River Basin. Active studies include the salinity control efforts for the Price- San Rafael, Glenwood-Dotsero Springs, and San Juan River Units, plus additional studies in areas such as diffuse source control and industrial use and co-generation/desalination opportunities in the basin. Other active studies are: Upper Gunnison- Uncompahgre Basin, Sevier River Water Management, Four Corners Water Assessment and the Utah Area Water Demand Model. The New Mexico Regional Water Resource Study was begun this year. Reclamation also continues to provide assis- tance as requested through Technical Assistance to the States activities as well as activities of environmental and interagency coordination and other minor work. Continuing this year is a program for evaluating system optimization on some existing projects with several scheduled for evalu- ation. 1. COLORADO a. Upper Gunnison-Uncompahgre Basin Study Phase I of this study was conducted by the Colorado Water Resources and Power Development Authority with assistance from Reclamation, and was completed in 1989. Phase I involved an appraisal-level study of the recreation and water supply development opportunities in the basin, in- cluding the potential for transmountain diversion of water to the east slope for municipal and industrial uses. Phase II was initiated in 1990. It is co-sponsored by seven Federal, State and local entities and will define the hydrology and water rights in the basin and develop two computer models. One model will be a water accounting spreadsheet that will accurately reflect the daily administra- tion of the major water rights and exchanges in the Gunnison Basin. The second will be a computer based planning model for the basin. Reclama- tion investigation funds are being used in Fiscal Year 1991 to continue the study. b. Four Corners Water Assessment This investigation began in Fiscal Year 1990 and will continue in Fiscal Year 1991 to investigate and recommend more effective management and use of water resources in the Four Corners area. The study also will 55