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' 1.4 Results <br />The key results of the Yampa modeling effort are as follows: <br />1.) Using StateMod, a water resources planning model has been developed that can make <br />comparative analyses of historical and future water management policies in the Yampa <br />River basin. <br />2.) The model has been calibrated for a study period extending from water years 1975 to 1991, <br />a time period in which basin operations have been relatively constant. <br />3.) The calibration is considered good, based on a comparison of historical to simulated <br />1 streamflows, reservoir contents, and diversions. <br />4.) A baseline data set has been prepared which, unlike the calibration data set, assumes all <br />existing water resources systems were on line and operational from water years 1975 to <br />1991. This baseline set is appropriate for evaluating various "what if' scenarios over a long <br />hydrologic time period containing dry, average, and wet hydrologic cycles. <br />1.5 Future Enhancements <br />The Yampa Model was developed to include 100 percent of the basin's consumptive use through a <br />combination of explicit and aggregated structures. Future enhancements to the Yampa Model include <br />the following: <br />1.) More detailed modeling of lands near Colorado's border with Wyoming. Significantly large <br />parcels of land in this area were modeled in aggregated fashion, because lands in Colorado <br />are served by Wyoming water rights and vice versa. New work to clarify water use on these <br />lands may be forthcoming within the next year from the Division 6 office. Only after that <br />information becomes available would it be practical to pursue such an enhancement to the <br />model. <br />2.) Incorporation of additional information through consultation with the division engineer and <br />other major water users regarding historical and future reservoir operations <br />Executive Summary 1 -3 <br />