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<br />MWSl Projecl <br />Interruptible Supply Framework Report - DRAFT <br /> <br />August 21. 1995 <br /> <br />8.3 csr System "Wheeling" <br /> <br />Deli very of ISC water from northern agricultural areas to the Denver metro area <br />would require additional conveyance facilities. Because of their location and <br />geographic extent, the Colorado-Big Thompson project facilities may be usable to help <br />convey ISC water to the metro area, thereby reducing the length of any new <br />conveyance facilities, Under this concept. reduced diversions by the ditch systems <br />participating in the ISC arrangement could be "exchanged" into the CBT Project <br />system by reducing concurrent CBT deliveries to non-participating entities and <br />allowing the ISC water to be diverted by those entities as a substitute supply. This <br />would result in increased CBT system storage which could then be used as a delivery <br />source to the metro area from Carter Lake via a new pipeline, This operational scheme <br />would have to be developed so as to avoid impacts to CBT and Windy Gap deliveries <br />and there are a number of institutional and operational issues that would have to be <br />addressed and resolved, One major concern of the NCWCD would be that the use of <br />the CBT Project for such a purpose would not impair the Project's ability to fully and <br />flexibly meet its delivery obligations to CBT and Windy Gap users in critical dry <br />years. <br /> <br />8.4 ISC in Relation to Other Water Supply Option Categories <br /> <br />From the Denver metro perspective, interruptible supply contracts serve the same <br />purpose as conjunctive use scenarios - they both supplement when surface supplies are <br />inadequate, In areas where exchanges of effluent could be made or ISC options could <br />be exercised, since the effluent is already there. it may not make sense to impact <br />agricultural land through ISC contracts, When comparing ISC opportunities to other <br />alternatives, it may be important to factor in potential conveyance costs, If the <br />conveyance costs are approximately the same, as it could be when comparing ISC to <br />the direct purchase of agriculturallal1ds, this impact can be neglected in the economic <br />analysis. On the other hand, if interruptible supply contracts are being compared to <br />other alternatives. then potential ISC conveyance costs could seriously reduce or <br />eliminate any economic benefits of ISC arrangements. <br /> <br />Hydrosphere Resource Consultants <br /> <br />23 <br />