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I I I I I I I I I I I I I I I I I I I I Users' Association. The association schedules releases fro~ the reservoirs and delivers to various irrigators, The schedule involves a number of exchanges of water among holders of storage rights, The foregoing comments are an overview of problems, The remainder of this report deals with problems, needs and possible solutions. Section 6: The 1986 Study The 1986 study, which was conducted for CWCB, GMWCD and CRWCD by PRC Engineering, was different fro~ the previous studies cited above in several signifi- cant aspects as follows: A, Hydrological Data. Quantities of water available for development were determined on the basis of streamflow data covering the years from 1941 to 1984, This is a longer period of record than the time span of data used in previous studies and therefore the hydrological findings in this study have a greater degree of reliability. Furthermore, water available for development was quantified for years of low flow, normal flow and high flow as well as average availability in all years, which likewise enhances the degree of reliability of the hydrological findings, B, Transbasin Transfers. More intensive and effective use of water originating within the Tongue Creek basin was not (as in one of the previous studies) considered to be the only method to increase the availability of water for improved irrigation, Transbasin diversion was also examined as a possibility, subject to the constraint that all water rights in neighboring basins would have to be met in full before any water could be transferred, Transbasin diversion to the Tongue Creek basin was evaluated in terms of making maximum use of existing canals, primarily Overland Ditch, The possibility of a Grand Mesa Canal, which was studied by the USBR as a new canal to be largely parallel to Overland Ditch along much of its route, was not considered in this study, 1-7