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<br />'I <br /> <br />Water and Storage Needs Assessment <br />SECWCD/Assessment Enterprise <br />December 10,1998 <br /> <br />6.5.2 Rationale for Determination of Storage Need for District Entities <br /> <br />While the storage needs identified individually by District entities provide one basis for project <br />definition, a more rigorous assessment is required to provide justification for a future storag~ <br />~~ ' <br /> <br />. <br /> <br />Needs fonidditional water in the municipal sector will occur primarily in the Fountain Valley <br />area, with 85 percent of the year 2040 water need occurring in tJ1e Colorado Springs water <br />service' area~ Based on review of Colorado Springs' water supply planning documents, they <br />require additional storage capacity to maximize the yield from their existing, developed' and <br />conditional water rights. Storage of 45,000 af of non-Project water in Project storage space has <br />been proposed as a critical element of Colorado Springs"long-teim water supply strategy. This <br />action, coupled with "local" projects will alleviate projected water supply deficits through the <br />year. 2040. . <br /> <br />As descnbed in Section 7, active storage space in Project reservoirs is approximately 305,000 <br />af, of which 159,000 afare allocated to carry-over storage for the Fountain Valley A\J.th9rity' <br />entities (78;000 at), Arkansas Valley toWns east ,of Pueblo (37,400 at), Pueblo (51,200 a:t), and <br />Arkansas Valley towns west of Pueblo (12AOO at). ,The Project can divert a maximum of <br />120,000 affrom th~ West Slope in any year, subject to the Project's Operating Principles. If <br />Project storage space is dedicated in the Project reservoirs to meet other needs, the amount of <br />"foregone" West Slope d~versioIis is likely. to increas~. ''this may be offset in"part by the <br />increasing use of Fry-Ark water by the M&I sector over the next 10 to 15 years as the M&I <br />sector moves toward its full 51 percent allocation of Project water. <br /> <br />According t9 the Colorado Springs long-range water plan, future water needs will be met by a <br />combination of non-potable development, conservation, improvements to the existing system, <br />and a major new delivery system. Roughly 70 to 75 percent of future water needs will be met <br />by a major new delivery system CUrrently, the "Southern Project" is the City's preferred option. <br />This project will withdraw water from Pueblo Reservoir and deliver it to the City via a new, <br />pipeline parallel to the Fountain Valley Aqueduct As shown in Table 6.5, the total deficit <br />forecast under the high groWth scenario for Colorado Springs in the year 2040 'is 72,400 at: <br />Assuming 70 percent of this identified need is met by the Southern Project, the, delivery <br />requirement would be approximately 50,000 af. As desCribed in Section 7, Colorado Springs <br />has requested storage of 45,000 af in' the Project for its non-Project water. Under the base <br />forecast, the year 2040 deficit for Colorado Springs is estimated to be 13,000 af (see Table 6.9). <br />Therefore, the need for storage in Project facilities may be smaller under the base forecast. <br />However, Colorado' Springs has indicated that its planS for exPansion of the Otero Pumping <br />Station and for the Southern Supply Project will require that the full storage request (45,000 at) <br />be available in order to justify major investments in pipeline construction. ' <br /> <br />9741IIFinaU\TBXT-A. WPD <br /> <br />6-21 <br /> <br />I GEl Consultants, Ine. <br />