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Water Budget <br />An overall average water budget for Phase lb 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 />479,000 a£ Diversions over this period average 1.38 million af, suggesting an average efficiency <br />of approximately 35 percent. Losses during this period average approximately 380,000 af. <br />This water budget reflects representation in the surface water model of 100 percent of decreed <br />surface water rights. No values appear for well water use (inflows and consumptive use) appear <br />as wells were not represented during Phase lb efforts. <br />Summary <br />The Phase lb Rio Grande Surface Water Model has been completed. One-hundred percent of <br />decreed surface water rights in the Rio Grande Basin, 12 explicitly modeled reservoirs, 10 <br />aggregated reservoirs and 28 instream flows are represented in the model. Operations are <br />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. Phase lb results showed a slight improvement in calibration over Phase la results <br />in most areas. <br />Comments and Concerns <br />Phase lb model results includes aggregations of reservoir with decreed absolute storage rights as <br />shown in HydroBase. Additional storage rights, specifically smaller stock ponds, may be decreed <br />in Division 3, but are not, at this point, represented in the model. Although it is likely any <br />additional storage rights represent a relatively small amount (volume) of storage, these rights <br />should be included in future model development. <br />Attachments <br />1. Phase lb Results -Stream Flows <br />2. Phase lb Results -Demand Shortages <br />3. Phase lb Results -Reservoir EOM Contents <br />C:Acdss\Task7-8.doc Phase lb Model March 17, 2000 -Page 9 of 10 <br />