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CRDSS <br />TASK MEMORANDUM 1.15-1 <br />Water Rights Planning Model <br />Summary of Model Recommendation <br />1.0 ISSUE <br />A number of computer models have been developed for river basin simulation and have been applied <br />for the general purpose of water rights planning. The purpose of Task 1.15 (a) of the CRDSS project <br />was to review appropriate models, evaluate their functionality with respect to the goals and <br />objectives of the CRDSS, assess the availability of the model code and documentation, and <br />recommend a model for incorporation into the CRDSS. This memorandum summarizes the results <br />of the Task 1.15 (a) work effort and the final recommendation. <br />2.0 DISCUSSION/ANALYSIS <br />As part of this task, seven computer models were reviewed and evaluated with respect to overall <br />functionality, particularly in relation to the goals and objectives of the CRDSS. The process <br />included a review of the source code and documentation (where available); numerous meetings with <br />individuals familiar with the application of the models; and an evaluation based on two general <br />levels of decision-making criteria (see Task Memorandum 1.15-2). The first decision level (Level <br />One) was structured to address the broader issues of the selection process including: availability of <br />model source code, status of model documentation, and fundamental features of functionality. This <br />level served as the initial filter for evaluating the suitability of the models. The second decision level <br />involved a more detailed and project-specific evaluation, focusing more on technical functionality, <br />user compatibility, performance, and flexibility for the water rights planning issues contemplated for <br />the CRDSS. Many of the Level Two criteria are subjective by nature, and the review was intended <br />primarily to identify other attributes and/or constraints that were not identified in the Level One <br />review. The results of the evaluation of the seven water rights planning models are presented below. <br />Four of the seven models were determined to be unsatisfactory with respect to the Level One criteria <br />and were eliminated from further consideration. <br />OPSTUDY <br />This model is essentially an input/output manager and has no core code for water rights <br />planning functions. It serves as a framework for source code written for specific and unique <br />water resource applications; see Task Memorandum 1.15-6. <br />SAMSON <br />This model is considered a watershed management model rather than a water rights planning <br />model. It was developed to simulate stream-aquifer interaction and attempts to incorporate the <br />entire physical processes of the hydrologic cycle (including precipitation, runoff, ET, and <br />ground water flows) on a daily basis. The model does not provide satisfactory modeling <br />capabilities for water rights allocations pursuant to the priority system, detailed reservoir <br />1 <br />A275 05.10.94 1.15-1 Fosha, Hyre <br />