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CWCB Construction Fund Grant Application Grand Valley Water Management Project 6 Protection of Conserved Water The Orchard Mesa Check settlement provides the mechanism for Reclamation to declare a surplus condition in Green Mountain Reservoir when the storage volume is above an agreed upon draw down curve. Under this concept surplus waters would then be available for contract delivery to the Grand Valley Power Plant, and other non-consumptive industrial uses, and indirectly to the 15-Mile Reach. From this point the water would be protected against future appropriators by the instream flow right being sought by the Colorado Water Conservation Board. In exchange for this additional discretion in Green Mountain Reservoir operations, the co-applicants (United States, Grand Valley Water Users Association, and Orchard Mesa Irrigation District) and Grand Valley Irrigation Company have agreed to limit their call for water rights administration to 1,950 cfs, i.e. not exercise the power right during times of peak irrigation demand. To the extent that actual irrigation demands fall below 1,950 cfs the power right can exercised to bring the cumulative call amount to 1,950 cfs. One of the attractive features of this concept is that it addresses the institutional problems associated with utilizing reduced diversions from the Grand Valley Project for the benefit of the endangered fish species. To the extent that the Grand Valley Project's reliance on Green Mountain Reservoir storage is reduced it will create a more frequent and larger magnitude surplus storage condition. Operation studies conducted to determine the flow regime in the 15-Mile as a result of the settlement and reduced demand conditions resulting from implementation of the Grand Valley Water Management concept indicate that 15-Mile Reach flows can be significantly improved. Reclamation has conducted a daily time step analysis for the 1994 water year. The results of this analysis are available for review upon request. The CWCB staff are conducting an analysis of 15- Mile Reach flow conditions under the Orchard Mesa Check settlement conditions and reduced Grand Valley Project demands for the 1974 through 1991 period using the Colorado River Decision Support System. 6. For existing facilities indicate: (a) the number of shareholders, , or (b) the number of customers served 1,500. Part B. - Description of the Project 1. Name of the project or facility: Grand Valley Water Management Canal System Improvements