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<br />oi' <br /> <br />Abstract <br /> <br />The South Platte River basin is a tributary of the Missouri River. Three States share the <br />basin (Colorado, Nebraska and Wyoming), with most of the basin in Colorado (79 <br />percent). Colorado's population has been growing rapidly, especially in Front-Range <br />cities, increasing the demand on water resources in the basin. Highly productive plains <br />agriculture is also a substantial user of water resources and new uses also can be expected <br />for wildlife and recreation. A decision support system (DSS) is being planned by the <br />State of Colorado for water management in South Platte River Basin. Anticipated needs <br />of the system include data development and some model development specific to the <br />South Platte. Due to the unique characteristics of the South Platte River Basin, the <br />implementation oftbis framework is expected to be slightly different from other basins in <br />Colorado. The SAMSON (Stream-Aquifer Model for Management by SimulatiON) <br />Model, developed in the 1980s specifically for the South Platte River Basin, has been <br />recommended by past studies for use in a South Platte DSS. This report provides an <br />analysis of the current SAMSON model. The conclusions oftbis report recommend that <br />SAMSON in its present form not be used as part of a DSS, largely due to recent <br />developments in modeling philosophy, application, and use. SAMSON proved the entire <br />South Platte River Basin system could be effectively modeled, and pointed to the <br />priorities for data collection and development. Components of SAMSON could be part <br />of future DSS systems, but they should be separated into individual modules and <br />evaluated individually against existing models. In summary, the analysis of SAMSON <br />clearly shows the need for a modular and data-centered approach for a South Platte DSS. <br />1 ,~,' <br /> <br />'V <br />.. <br />''.", <br /> <br />~.~.,I <br /> <br />:{: <br /> <br />'. <br /> <br />ii <br />