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CRDSS <br />TASK MEMORANDUM 1.15-26 <br />Water Rights Planning Model <br />Year 1 Summary <br />1.0 ISSUE <br />The scope of work includes preparation of a final task memorandum summarizing the Year 1 efforts related <br />to the development of a prototype water rights planning model (MODSIM ) for application in the Gunnison <br />River basin. <br />2.0 DISCUSSION/ANALYSIS <br />Introduction <br />During the Phase I effort, the MODSIM computer mode l was selected for application as the water rights <br />planning model tool for the CRDSS. The model was developed and is supported by Dr. John Labadie at <br />Colorado State University. MODSIM is fundamentally similar to the Central Resource Allocation Model <br />(CRAM) developed by Hydros phere Resource Consultants, which was adopted for use in prior water rights <br />modeling efforts in the Gunnison River basin, the Gunnison River Basin Planning Model (GUNMOD). The <br />final version of GUNMOD was delivered to the Colorado Water Conservation Board (CWCB) in early <br />December 1994. <br />In order to take advantage of the prior work efforts in the Gunnison River basin, the majority of the basic <br />input data was imported to M ODSIM from GUNMOD. These data included (a) monthly estimates of <br />natural streamflow and inflows for all of the basi c stream network; (b) monthly time series of the <br />consumptive irrigation requirement for six identifie d subdivisions of the G unnison River basin; (c) <br />estimates of the irrigated acreage for each water right (or structures included in the network model); (d) <br />irrigation efficiencies, return flow patterns, and return flow locati ons; (e) physical characteristics for <br />reservoirs; and (f) aggregation of water rights by "priority class". Although the MODSIM model is <br />designed to closely emulate GUNMOD, a number of modifications and enhancements were incorporated to <br />achieve a more generic model for application in the future river basins. <br />Subtask Work Descriptions <br />Subtask 1 - User Involvement <br />In order to gain a better understanding of the water rights administration issues in the Gunnison River basin, <br />two meetings and numerous telephone conversations were conducted with the Division 4 Engineer and a <br />number of Water Commissioners. Mee tings were also held with the following water user groups: (1) The <br />Tri-County Water Conservanc y District (Dallas Creek Project and Project 7), (2 ) The Uncompahgre Valley <br />Water Users Association (UVWUA), (3) The Fruitla nd Mesa Water Conservancy District, (4) The <br />Crawford Water Conservancy District (Smith Fork Project), and (5) The Bostwick Park Water Conservancy <br />District. Information regarding operating policie s for the federal reservoirs was obtained through <br />communications with the U. S. Bureau of Reclama tion (USBR). During Phase II, one meeting was held <br />with the Water Rights Planning Model Technical Subcommittee. <br />1 <br />A 275 .01.09.95 1.15-26 Fosha <br />