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Las Animas Consolidated Canal Company Agenda Item 27d. <br /> November 19-20,2014 Board Meeting(Updated November 21, 2014) <br /> Page 3 of 6 <br /> Water Rights <br /> The Company's annual diversions have ranged from about 8,000 to nearly 42,500 acre-feet, but average <br /> approximately 26,000 acre-feet. Its water rights are listed in the following Table 1: <br /> TABLE 1: IMPACTED WATER RIGHTS <br /> Name Amount Appropriation Adjudication <br /> Date Date <br /> LAS ANIMAS CONSOLIDATED 22.3 CFS 4-10-1875 4-8-1905 <br /> CATLIN CANAL 22.0 CFS 12-3-1884 4-8-1905 <br /> LAS ANIMAS CONSOLIDATED 80.0 CFS 3-13-1888 4-8-1905 <br /> LAS ANIMAS CONSOLIDATED 5.5 CFS 3-7-1884 4-8-1905 <br /> LAS ANIMAS CONSOLIDATED 44.8 CFS 4-15-1909 8-30-1922 <br /> Project Description <br /> The spillway structure that was destroyed is believed to have been constructed in the early 1920s. It <br /> was comprised of three major parts: three canal control gates, a radial gate to flush sediment, and a <br /> spillway to control flow and level upstream of the canal measurement flume. <br /> Following the failure of the spillway structure earlier this year, a temporary earthen plug and spillway <br /> structure was constructed in the existing canal so that the Company could continue to operate through <br /> the irrigation season. <br /> To determine a best course of action to restore full function of the ditch and structure, four <br /> rehabilitation alternatives were evaluated: <br /> Alternative No. 1 - No-action: <br /> The "No Action" alternative is not preferred because of the deficiencies associated with the temporary <br /> repair. With relatively minor modifications, it is possible that the temporary repair could be used for a <br /> few more irrigation seasons without endangering the canal, but it is not a permanent solution. <br /> Alternative No. 2- Modify Existing Temporary Structure: <br /> The second alternative would be to modify the existing temporary structure to improve functionality. <br /> First, a slide gate should be added to the level control outlet pipe to allow sediment to be flushed <br /> through the spillway. This would also allow the ditch superintendent additional control over river <br /> returns. Second, an alternative trash rack design (beehive or similar) could be used on the level control <br /> to improve debris removal. An access bridge would also improve access to the level control for <br /> maintenance and allow operation of the proposed gate. Finally, the existing failed concrete spillway <br /> would be demolished and removed, and additional stabilization added to the canal banks and earthen <br /> plug. The total cost for this alternative was estimated to be approximately $61,000. This alternative <br /> was not selected since, while not a temporary solution, it would not have the longevity and resilience <br /> as available in the following options. <br /> Alternative No. 3 - Demolish spillway structure but reuse existing radial gate: <br /> The third alternative would be to demolish and rebuild the entire spillway structure utilizing the <br /> existing radial gate. The proposed structure would be a complete in-kind replacement of the structure <br /> and include two new 4-foot x 4-foot slide gates at the head of the canal, and a new concrete spillway <br /> with access bridge. The existing structure and temporary repair would be demolished and removed. <br /> The new structure would be constructed in the same location with an improved foundation and tie-in <br /> to the canal bed and banks. The existing radial gate would be reused to allow sediment flushing and <br /> the canal to spill in the event of emergency. The proposed structure would include stop log slots <br /> around all gates to allow for operational flexibility and ease of maintenance. The primary drawback of <br />