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<br /> <br />Forest Leaf - Central Colorado Water Conservancy District <br />Jack Odor - Groundwater Appropriators of the South Platte <br /> <br />1bis group met regularly and evaluated the available data and models available for the South <br />Platte. The group also identified specific data and modeling needs that could be achieved <br />through joint efforts. The group used the work published and/or researched by The Colorado <br />Water Conservation Board, John Eckhardt, Darrell Fontane, Henry Kunhardt, Robert Leaf etc. <br />(CWCB, 1995; Kunhardt and Fontane, 1995; Fontane et al., 1994; Fredericks, 1993; Eckardt, <br />1991). <br /> <br />Four phases have been completed to produce an evaluation of the SAMSON model: <br />. Phase 1: Literature Review - During Phase 1 an understanding of the issues (water <br />resources, water rights, water management and institutions, compact, water quality, <br />endangered species and Memorandum of Agreement) as well as a review of relevant <br />literature has been completed. <br /> <br />. Phase 2: Understanding the SAMSON model- The understanding of the SAMSON <br />model was completed in Phase 2 of the project by running the model, and identifying: (i) <br />the physical constraints and strengths, (ii) the data requirements, (iii) the data availability <br />for the model, and (iv) the limitations of the model. <br /> <br />. Phase 3: Specific needs for the South Platte River - To understand the specific needs for <br />the South Platte River, an "Advisory Committee" was appointed during the project as <br />discussed earlier. Additional meetings are planned to continue work in data and <br />development of some components. <br /> <br />. Phase 4: Evaluation - The original sample data for SAMSON was reformatted to run with <br />the latest version of SAMSON. 1bis data was developed to formulate and calibrate the <br />South Platte River basin from Denver to the Nebraska state line (Morel-Seytoux and <br />Restrepo, 1987). Some minor modifications were made to the code and SAMPSON was <br />run using the sample data. <br /> <br />Princioal Findin!!S <br /> <br />Since the initial development of the SAMSON model, computer speed and availability has <br />revolutionized the modeling process and users expect a much higher degree of interaction with <br />models. Consequently, there have been significant advances in hardware technology as well as <br />the philosophy of software development. Modeling philosophy has evolved towards building <br />decision support frameworks composed of small modules rather than a single, very complex <br />model. A modular design allows for the inclusion of models from different sources within a <br />data-centered approach. These systems typically have a relational database with routines for pre <br />and post processing and interchange of data that are generic enough to support multiple models. <br /> <br />When SAMSON was developed, the data-driven approach was not a common practice. <br />Therefore, some of the conditions it uses for modeling are built into the source code and cannot <br />be specified by the user. "This makes it very difficult to update and modify the code. SAMSON <br />attempts to model all processes that take place in the basin in a single program (e.g. water rights, <br /> <br />06/10 <br /> <br />19 <br />