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Final Draft - Preferred Storage Options Plan Southeastern Colorado Water Conservancy District June 8, 2000 the USBR. The amount of Project storage space would be reduced with a corresponding increase of non-Project storage space. . Re-operation Scenario B - Under this concept, an entity could store both its Project water and non-Project water in Project space, subject to the Allocation Principles and Operational Policies of the District. 3.3.1.2 Verification ofRe-operation Space Studies of both re-operation scenarios were made using an operational model (MW, January 2000) developed specifically for evaluating the preferred storage options plan. Model results indicated that storage space for Project water could be reduced without affecting project yields or the ability of the Project to meet demands. Under Re-operation Scenario A, Project storage could be reduced by approximately 23;000 af without affecting the Project's ability to meet demands. Under Re-operation Scenario B, Project storage could be reduced by 48,000 to 51,000 af without affecting the yield of the Fry- Ark Project or its ability to meet future water demands. This re-operation space then would be available to fulfill needs for non-Project water storage identified in the GEl Study. As described in Section 3.4, the model was structured to fully and accurately represent the operation of the Project under p..!ture demand conditions (i.e., all participants obtain their full allocations of Project water) and under the Allocation Principles, Allocation Policies, Operational Policies governing the Project. During the modeling effort, MW examined the potential benefits of providing 40,000 af of firm storage for Winter Water in Project reservoirs. While dedicating storage space for Winter Water does reduce the number and volume of spills ()f Winter Water in storage, it will not result in a significant increase in Winter Water deliveries. Depending on the ultimate configuration of the preferred plan, providing 40,000 af of firm space for Winter Water could increase average deliveries of Winter Water by 600 to 2,700 afper year. It does not appear that dedicating space in the Project for Winter Water storage will provide a sufficient enough increase in delivery potential to justify significant interest by irrigation interests in the District. 3.3.1.3 Potential Allocation of Re-operation Space Several entities needing additional storage capacity could benefit from the identified 48,000 to 51,000 af of re-operation space. Based on model simulations, CSU could effectively use up to 19,000 af (39 percent) of the re-operation space to store water by exchange and maximize the yield of a portion of their imported water supplies. Other municipal entities could. benefit in similar ways, including the Pueblo Board of Water Works, the other FV A entities, St. Charles Mesa Water District, and entities west of J:\PROJECTSI9906I\Repons\PR:f(TTed SOP FinaI.wpd 3-3 ~ GEl Consultants, Inc.