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The existing StateMod model will be enhanced to include river call reporting by node and time step, and will incorporate the updated HydroBase data described previously. This sustainable tool will be available to water users, the CWCB and DWR for planning purposes. An enhanced groundwater model for the Denver Basin and Overlying Alluvium Region that operates on a monthly time step and utilizes a one - quarter to one - square mile grid. This model will be the original SB 96 -74 groundwater model with the addition of the alluvial aquifers, for a total of seven layers. This enhanced model will facilitate better quantitative understanding of flows between the rivers, alluvial aquifer and the underlying Denver Basin aquifers, and among the Denver Basin aquifers. This enhanced groundwater model will allow unique treatment of each Denver Basin aquifer and the overlying alluvium. Estimates of well pumping will be refined significantly compared to the existing Denver Basin model. • A groundwater flow model of the Lower South Platte Alluvium Region (from the Stateline upstream to approximately Weldona) that operates on a monthly time step. There is no existing groundwater model for this region. Consequently, water users, the CWCB and DWR will now have access to a tool to help in the planning of water resources development as well as the management of water resources in this region. • Access to historic priority call data via the Internet and CDs that will help the water users understand how the river was administered to better understand future administration • Addition of new methodologies for calculating consumptive use, such as adding the Kimberly Penman method to StateCU to make the tool more versatile • Access to current and historic satellite images and maps of irrigated lands throughout the South Platte River Basin. With the historical irrigated land delineated, water users, the CWCB and DWR can better understand growth trends and water development potential as well as areas of potential conflict. • Access to a GIS network of surface water hydrology, structures and water distribution systems to aid in planning analyses. This gives the CWCB and DWR the ability to quickly modify or view areas where water resource issues arise. • Graphical and visual displays of model results. This gives the ability to convey to decision - makers at the CWCB and DWR in a clear and understandable way the results of planning analyses. User Involvement and Training User involvement during development of the SPDSS is crucial to the development of a practical decision support system that will be used. User training is also necessary to achieve active and widespread use and is included in each of the three alternatives. However Alternative 2 provides the most cost effective and efficient user involvement and training. User involvement will benefit the CWCB, DWR and water users by insuring more active and consistent use of SPDSS tools and data. p: \data \gen \spdss \final report \executive summary.doc E -7 October 31, 2001