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Objective 2 is addressed in Tasks 6 - 11 in Phase 1, Task 15 and 16 in Phase 2 and Task 20 <br />in Phase 3. Phase 1 begins by defining the basic model inputs and continues with a <br />sequential three-step approach to monthly calibration and data development; (1) Historic <br />Monthly Calibration, (2) Calculated Monthly Calibration and (3) Monthly Baseline Data <br />Development. In step 1, Historic Monthly Calibration, the model is developed using <br />historical diversions as demands and reservoir End of Month contents as reservoir targets. <br />Historic Monthly Calibration is implemented in three substeps (la, lb and lc). Phase la of <br />the Historic Monthly Calibration (Task 6) explicitly represents diversions that comprise <br />approximately 75% of the total decreed surface water use in the basin. The remaining <br />decreed surface water use is "left in the gage" (e.g. baseflow hydrology). Phase lb of the <br />Historic Monthly Calibration (Task 7) builds on the previous phase by modeling 100% of the <br />consumptive use associated with lands served by surface diversions. The surface diversions <br />not explicitly represented in the Phase la model (approximately 25%) are aggregated and <br />modeled as approximately 30 distinct demand points. Phase lc of the Historic Monthly <br />Calibration (Task 8) builds upon the previous phases by including ground water use and <br />results in a model that includes 100% of all, surface and ground, water use in the basin. <br />In step 2, Calculated Monthly Calibration (Task 9) is performed using calculated demands <br />for irrigation structures and targets or forecasts for reservoirs. In addition, the Calculated data <br />set operates reservoirs, the closed basin project, and the Rio Grande compact based on <br />operational rules. <br />In step 3, Monthly Baseline Data (Task 10) is developed for the calibrated model which <br />allows diversions, reservoirs, instream flows, and operating rules that were constructed or <br />have changed during the study period to operate in a consistent manner for the entire study <br />period. The baseline data set is the information typically used as a starting point (baseline) <br />when developing a "What If" analysis. <br />Tasks 15 and 16 continue to address objective 2 under the Phase 2 funding while Task 20 <br />addresses objective 2 under Phase 3 funding. In Phase 2 Task 15 extends the calibrated <br />model developed to operate on a daily time step while Task 16 performs an application to <br />verify the models calibration and functionality by applying it to "what if" analysis. In Phase <br />3, Task 20 allows the final results of the ground water model to be incorporated. <br />Objective 3 is addressed in Tasks 12-14 in Phase 1, Tasks 17-19 in Phase 2 and 21-23 in <br />Phase 3 by providing frequent coordination meetings with San Luis Valley water users, <br />technical subcommittees, and the State. Note, a contingency, is included in each phase to <br />provide the flexibility to perform additional analyses which are anticipated but cannot be <br />scoped at this time. <br />Implementation of this scope of work is expected to produce a model with the following <br />properties: <br />RGDSS Surface Water Scope of Work 3 11/8/98 <br />