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DSS Component Assessment <br />• Diversion requirements expressed either as historic or demand (crop requirements, etc.) <br />• Diversion parameters including ditch capacities, return flows, and delay patterns <br />• Reservoir parameters and operating roles <br />• Net evaporation from a free water surface (net reservoir evaporation) <br />• Historic streamflow <br />• Basin network information including diversion structures, reservoirs, instream flow <br />reaches, and streamflow gages <br />Input data requirements are entered via input files, generated by data management interfaces (DMIs) <br />and other utilities, and often developed from other components. <br />4.1.2.5 Specific RGDSS Issues <br />For a Rio Grande application, the following enhancements to StateMod are expected to be required: <br />• Allow ground water from one or more aquifers (confined and/or unconfined) to be used <br />as a water supply <br />Allow a flow limited futile call to be included that would allow rivers such as the <br />Alamosa River to operate independently of the Rio Grande under certain flow conditions <br />• Allow surface water to be diverted for recharge <br />4.1.3 Consumptive Use Modeling <br />The CRDSS consumptive use model, StateCU, contains a consumptive use model, a GUI, and DMI <br />routines for interaction with the central database. Consumptive use is the estimated water leaving an <br />area due to human activity. Human activities include traditional municipal supply and agricultural <br />use, as well as non-traditional livestock consumption, and evaporation from reservoirs and stock <br />ponds. <br />Evapotranspiration consumptive use for irrigated agricultural lands can be calculated in StateCU <br />using the standard or enhanced SCS Blaney-Griddle method. The Penman-Monteith is available but is <br />limited in application because of the data required for this method. <br />4.1.3.1 Implementation <br />The consumptive use model within CRDSS is a generic, data driven model that can be applied to the <br />RGDSS with minor modification. <br />4.1.3.2 Temporal/Spatial Scope <br />The consumptive use model can run spatially on county HUC areas, water/irrigation districts, and <br />irrigation parcels. Results can be aggregated to basin or sub-basin delineations. <br />4.1.3.3 System Requirements <br />StateCU runs as a stand-alone program or with a GUI. When CRDSS is complete, both the stand- <br />alone version and the GUI will run on a PC. <br />4.1.3.4 Data Requirements <br />The consumptive use model requires the following information that can be collected and stored in <br />HydroBase: <br />a454/report/final/comp. doc 07/2&~OS Y-3 <br />