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Subtask 14 - Scenario Simulation <br />In order to test the capabilities of the MODSIM pr ototype, the model was set up and run for a potential <br />future operational scenario involving the analysis of the impacts to existing absolute and conditional water <br />rights that would result from imposition of an instream flow right, with a relatively senior priority, at a <br />critical location in the river basin. For this scenario, the impacts were assessed by comparison of <br />streamflows at key USGS gages for ?pre-? and ?pos t-? implementation and by comparison of diversions at <br />key structures for pre- and post-conditions. The imp acts, as demonstrated by these comparisons, can be <br />viewed graphically or in tabular form for any select ed water right or stream gage. The instream flow <br />scenario, including example results, is summarized in Task Memorandum 1.15-29, Scenario Simulation - <br />Instream Flow Rights. <br />Subtask 15 - MODSIM Documentation <br />During Phase IIa, complete, detailed, and up to da te documentation of th e program MODSIM was <br />completed and is included in the MODSIM Users? Manual . In addition, extensive on-line documentation <br />was developed to assist the user of the water rights planning model in (a) buildi ng a network or an element <br />of an existing network; (b) adding, de leting or otherwise modifying an ex isting element or construct of the <br />model; (c) changing assumptions related to system para meters such as efficiencies, water right priority, <br />timing, and location of return flows, etc. The on-lin e documentation also includes descriptions of many of <br />the more complex network constructs, such as rese rvoir accounting, exchanges, and instream flow rights. <br />Subtask 16 - Preliminary Work in Remaining River Basins <br />This activity was intended to get an initial start on the Year 2 modeling work by meeting with the Division <br />Engineers and key water users in the remaining CRDSS river basins. In January 1995, meetings were held <br />with the Division Engineers for Irrigation Divisions 5, 6, and 7. These meetings were useful as an <br />introduction to the goals and objectives of the CRDSS and specifically the water rights planning model and <br />as a means of beginning to identify key operational and administrative issues that will likely be encountered <br />in the development of the water rights planning models for these ba sins. Preliminary information about <br />major water resource development projects, stat us of major conditional water rights and tested <br />administrative techniques was gained through these meetings. <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />This task memo generally summarizes the work effort comprising the development of a prototype water <br />rights planning model for the G unnison River basin us ing program MODSIM. For the prototype <br />development, the majority of the input data were ported from the prior modeling efforts of the Gunnison <br />River Planning Model (GUNMOD) with minor modifica tions made where more specific information about <br />water rights, irrigated acreage and other data were av ailable. For modeling of future CRDSS river basins, <br />DMI Utilities and other tools have been developed to assist in the processing of data from the CRDSS <br />database. <br />The MODSIM prototype developed fo r the Gunnison River basin is stru ctured to represent the complex <br />policies for water rights administration and reservoir ope rations in the basin and provides a reliable tool for <br />the user to evaluate a number of ?what-if? scenarios re lated to future water right planning alternatives such <br />as new instream flow rights, the addition of senior conditional water rights, etc. The MODSIM model <br />provides the necessary functionality for the CRDSS proj ect purposes and has been developed as a flexible <br />tool for adaptation to the future CRDSS river basins. <br />8 <br />A 275 .01.09.95 1.15-26 Fosha <br />