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Repayment Contract. After first use within Subdistrict boundaries, participants may lease, <br />transfer, or sell the reuse or successive use rights for use within or outside the Subdistrict <br />boundaries. In contrast, return flows from the first use and subsequent use of C-BT water are <br />provided to downstream water users within the District. <br />Historical annual quotas and deliveries for the C-BT Project and Windy Gap Project over the <br />1957 to 2003 period were provided by NCWCD and summarized in Table 5. The available water <br />from the quotas is delivered either directly to the allottee or to the basin in which the allottee is <br />located. The major Project reservoirs within the Eastern slope distribution system (Horsetooth <br />Reservoir and Carter Lake) are used to regulate the supplies between the tributary South Platte <br />River basins. The District and the BOR generally move water into storage at Carter Lake so as to <br />have it nearly full, by March 1. Horsetooth Reservoir generally completes its fill a month or two <br />later. <br />As noted above, flexibility in operations of the C-BT Proj ect is vital. This is true, in part, due to <br />the fact that C-BT water is frequently leased to other water users within the District. Generally <br />speaking, C-BT leasing is driven by circumstances in which one or more basins have adequate <br />water supplies while the remaining basins do not. In this circumstance allottees located in basins <br />that have ample supply may lease all or a portion of their respective C-BT water to water users <br />located in other areas of the District. It is also common for C-BT water to get leased from <br />municipal users to agricultural users during wetter years, with the reverse occurring in less-than- <br />average years. <br />Allottees are able to obtain additional flexibility in the use of their C-BT water by electing to <br />participate in the District's Carryover Program. The Carryover Program allows allottees to retain <br />control of water not used in any given water year and store the water within the C-BT Project for <br />use in the following water year. Allottees are only allowed to enroll 20 percent of their respective <br />C-BT unit ownership (in acre-feet) into the Carryover Program. <br />COMMENTS AND CONCERNS <br />The complexities of the NCWCD and C-BT Project operations are not addressed in detail herein. <br />NCWCD maintains a MODSIM model for analysis of C-BT Project operations within the <br />District and western slope river basins that include C-BT Project components. The MODSIM <br />model has not been reviewed for this effort. The model and operating rules included in the model <br />should be reviewed as part of the future SPDSS surface water modeling effort to gain a better <br />understanding of the specifics regarding NCWCD operations and its influences to the water <br />supply of northeastern Colorado. <br />Where to find more information <br />^ Procedures for determining key diversion structures and a list of all key diversion structures <br />selected is presented in SPDSS Task 3 -Identify Key Diversion Structures Overall Task <br />Memorandum. <br />15 of 17 <br />