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MODEL DESCRIPTION <br />A computer-based water supply and system analysis model of the District was <br />prepared to evaluate the study's objectives. The model consists of two separate <br />modules. The first module is a Supply Side model which models water that is physically <br />and legally available. This model is focused primarily on East Snowmass Creek and <br />Snowmass Creek, which is the primary dry-year supply for the District simply because <br />the available water supplies in the Brush Creek drainage are minimal in the dry years. <br />The second module is a Demand Side model that determines the Snowmass Creek <br />diversions based on the District demands and the District's Stream Flow Stewardship <br />Goal for supporting a minimum flow level in Snowmass Creek. The Demand Side <br />module uses the results from the Supply Side model as the water availability and stream <br />impact boundary, and evaluates raw water storage requirements to meet these demands <br />and goals. <br />The Supply Side model explicitly operates the East Snowmass Creek and the <br />main stem Snowmass Creek decreed water rights in a water balance format, assuming <br />strict priority of diversions for water rights, and determining the legal and physical <br />availability of water under the District's water rights. The Supply Side model, as well the <br />Demand Side model, use the 1977 and 2002 - 2003 droughts as representative <br />extremely dry periods for analysis. The Supply Side model is operated on a daily basis <br />for the periods of interest, extending from June 1976 through July 1978 and January <br />2002 through September 2004. The droughts of 1977 and 2002 are the first and second <br />driest periods in the past 100 years, respectively, in terms of monthly flow of the Roaring <br />Fork River at Glenwood Springs stream gaging station. <br />Page 4 <br />