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• Sixteen (16) aggregated irrigation structures were added to represent the remaining <br />irrigated lands, which were not explicitly modeled in Phase II (approximately 6,400 <br />acres). <br />• Two (2) aggregated reservoirs were added to represent the remaining decreed <br />storage not explicitly modeled in Phase II (approximately 4,200 ac-ft). <br />• Two (2) aggregated stock ponds were added to represent stock pond storage not <br />explicitly modeled in Phase II (approximately 4,800 ac-ft). <br />• One (1) aggregated municipal and industrial (M&I) demand was added to represent <br />the remaining M&I consumptive use not explicitly modeled in Phase II <br />(approximately 1,100 ac-ft). <br />• Miscellaneous refinements to the Phase II product (see Section 6.0, Calibration) <br />This report supersedes the previous work by documenting the results of both development efforts <br />(Phase II and IIIa). Appendix D, Enhanced White River Model, describes the activities associated <br />with the Phase IIIa activities. <br />1.3 Results <br />The key results of the CRDSS White River modeling effort are as follows: <br />• Using StateMod, a water resources planning model has been developed that can make <br />comparative analyses of historic and future water management policies in the White River <br />basin. <br />• The model has been calibrated for a study period extending from water years 1975 to <br />1991, a time period in which basin operations have been relatively constant. <br />• The calibration is considered good, based on a comparison of historic to simulated <br />stream flows, reservoir contents, and diversions. <br />• 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 <br />hydrologic time period containing dry, average, and wet hydrologic cycles. <br />1.4 Future Enhancements <br />The White Model was developed to include 100 percent of the basin's consumptive use through a <br />combination of explicitly and aggregated structure modeling. Future enhancements to the White <br />Model could include the following but are not recommended at this time: <br />• Additional evaluation and refinement of the climate gages and procedures used to <br />estimate demands associated with irrigated acreage. <br />Execurive Summary 1-2 <br />