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<br />003115 <br /> <br />Page 14 <br /> <br />Another more specific simulation model was used to analyze that portion of <br /> <br />the Rasin within the State of Colorado above Glenwood Springs in order to <br /> <br />explore the potential use of increased streamflows within the State of Colorado. <br /> <br />I. Basin-wide Analysis <br />A network optimization model, a member of the more general class of linear <br /> <br />programming models, was chosen. The network optimization model is designed to <br /> <br />reveal the most beneficial routing of a limited resource through a set of nodes <br /> <br />and links which comprise a network, and for which alternative routings are <br /> <br />possible. The criteria for judging benefit are incorporated in an objective <br /> <br />function, and the resource limitations and link capacities are included in a set <br /> <br />of constraints. <br /> <br />MODSIM (Shafer, 1979) is a computer program designed to route streamflows <br /> <br />through a hydrologic system which is characterized by spatially differentiated <br />and linked nodes at which withdrawals and inflows occur and for which withdrawal <br /> <br />priorities can be specified. It uses the Out-of-Kilter Algorithm (Barr, Glover, <br /> <br />and Klingman, 1974) to solve a network optimization problem. It was chosen to <br /> <br />model the Colorado River system as a whole, and thus provides the basic <br /> <br />analytical framework for this study. <br /> <br />Two different objective functions, one institutional and one economic, <br /> <br />were used with the MODSIM program. By comparing the optimal water allocations <br /> <br />resulting from the use of these two objective functions, all other things being <br /> <br />equal, one can predict and evaluate the effects of water allocation <br /> <br />institutions. <br />