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Water Budget <br />An overall average water budget for Phase la modeling efforts over the period 1950 - 1997 is <br />shown in Table 4. This table shows an average basin-wide consumptive use of approximately <br />474,000 a£ Diversions over this period average 1.38 million af, suggesting an average efficiency <br />of approximately 34 percent. Losses during this period average approximately 277,000 af. <br />This water budget reflects representation in the surface water model of approximately 90 percent <br />of decreed surface water rights. No values appear for well water use (inflows and consumptive <br />use) appear as wells were not represented during Phase la efforts. <br />Summary <br />The Phase la Rio Grande Surface Water Model has been completed. Approximately 90 percent <br />of decreed surface water rights in the Rio Grande Basin, 12 reservoirs and 28 instream flows are <br />represented in the model. Operations are characterized by approximately 300 operating rules. <br />Numerous calibration runs have been performed and several adjustments have been made to the <br />network structure and hydrology. The model calibrates quite well based on comparisons of <br />historical observations to modeled diversions, modeled reservoirs EOM contents and modeled <br />stream flows. <br />Comments and Concerns <br />None <br />Attachments <br />1. Phase la Results -Stream Flows <br />2. Phase la Results -Demand Shortages <br />3. Phase la Results -Reservoir EOM Contents <br />C:Acdss\Task6-14.doc Phase la Model (Flistoric Monthly) February 22, 2000 -Page 9 of 10 <br />