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<br />Section 2: History of SAMSON <br /> <br />The SAMSON (Stream Aquifer Model for Management by SimulatiON) model was developed <br />in the 1980s, over a I 5-year period, primarily by Jorge Restrepo and Hubert Morel- Seytoux. <br />Originally developed on a Cyber 205 (CDC-205) in Fortran (Morel Seytoux, 1987), the model <br />was ported to a PC in 1991 (Quick Basic). <br /> <br />SAMSON was evaluated in the late 1980s by a "Technical Support Subcommittee" (TSS), part <br />of the South Platte Basin Water Management Committee (SPBWMC) involved in the South <br />Platte Basin Study. The study was sponsored by the following entities: Central Colorado Water <br />Conservancy District (CCWCD), Lower South Platte Water Conservancy District (LSPWCD), <br />St. Vrain and Left Hand Water Conservancy District (SV &LHWCD), and Northern Colorado <br />Water Conservancy District (NCWCD). Other entities also contributed to the TSS: Groundwater <br />Appropriators of the South Platte (GASP), the South Platte Basin Coalition, Denver Water <br />Board, Colorado Division of Water Resources, Colorado Water Resources and Power <br />Development Authority, U.S. Geological Survey, and the Bureau of Reclamation. <br /> <br />Some of the activities performed during the September 1988-November 1989 period of the study <br />included: (i) interviews with individuals associated with irrigation entities, and (ii) identification <br />and evaluation of computer models that could be applied to the South Platte River, downstream <br />of Denver. <br /> <br />In December, 1987, members of the Technical Support Subcommittee (TSS) [including <br />appointments from each of the following: USGS(1), LWPWCD(I), CCWCD(1), NCWCD(2), <br />USBR(1), GASP(1)] began a review of available computer models that could be adapted to meet <br />the needs of the South Platte Basin Study. The seven models considered for use in the South <br />Platte Basin Study were: (i) South Platte Water Management Model developed by the USGS, (ii) <br />SAMSON Model developed by the CWRRl, (iii) DRAM or Dynamic Resource Allocation <br />Model developed by Cheryl Signs Engineering, (iv) RIBSIM or River Basin Simulation Model <br />developed by Leonard Rice Consulting Water Engineers, Inc., (v) CRAM or Central Resource <br />Allocation Model developed by WBLA, Inc., (vi) BESTSM or Boyle Engineering's Streamflow <br />Simulation Model developed by Boyle Engineering Corporation, and (vii) WRAM or Water <br />Rights Allocation Model and DYNFLOW developed by Camp Dresser & Mckee, Inc. Nine <br />months later (August 9,1988), the TSS recommended that the SAMSON Model be selected for <br />use in the study. <br /> <br />On September 13, 1988, the Executive Committee approved the recommendation of the TSS <br />regarding the selection of the SAMSON model and concluded: (i) that extensive work was <br />needed before the SAMSON model can be used in the South Platte Basin Study, (ii) that <br />verification of the data currently contained in the model's database is required, and (iii) that some <br />efforts relating to the calibration and the validation of the model must be completed. The last <br />two efforts regarding data checking and model calibration were never done or comph:;ted as <br />stated on February 1, 1995 in a memo from the Northern Colorado Water Conservancy District. <br /> <br />OG47 <br /> <br />6 <br />