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5T ATE OF COLORADO Colorado Water Conservation Board Department of Natural Resources 1313 Sherman Street, Room 721 Denver, Colorado 80203 Phone: (303) 866-3441 FAX; (303) 866-4474 www.cwcb.state.co.us MEMORANDUM (Updated March 28, 2003) Bill Owens Governor TO: Colorado Water Conservation Board Members Greg E. Walcher Executive Director FROM: John Van Sciver Mike Serlet, P.E., Chief Water Supply Planning and Finance Section. Rod Kuharich CWCB Director Dan McAuliffe Deputy Director DATE: March 11, 2003 SUBJECT: Agenda Item 24e., March 24-26, 2003 Board Meeting The Supply Irrigating Ditch Company Introduction The Supply Irrigating Ditch Company (SIDG) is applying for a loan in amount of $1,000,000 to rehabilitate and enlarge the Knoth Reservoir Dam. The estimated total cost of the project is $2,193,000. Please see the attached project summary and map. Backaround The SIDC, located in Boulder County, operates the Supply Ditch for the benefit of the shareholders by providing direct flow irrigation water. The Supply Ditch diverts from St. Vrain Creek near Lyons and delivers water through a 15-mile ditch system to the 8,500-acre service area as a partial supply. The Supply Ditch operates without an equalizer reservoir and it is difficult to control direct flow deliveries. The SIDC has an opportunity to acquire a perpetual easement to use the Knoth Reservoir as well as a water right to store 379 acre-feet. The reservoir would be used to equalize ditch flows and store the decree. The SIDC would pay the cost of the rehabilitation as a condition of acquiring these rights. The existing Knoth Reservoir isa Class 3 structure with a capacity of 220 acre-feet. The State Engineer has restricted the reservoir to zero storage due to seepage problems and other safety issues. The enlarged Knoth Reservoir will be a Class 2 structure with a capacity of 540 acre-feet. All dam safety issues will be addressed as part of the construction project. Feasibility Studies Duane Smith, P.E., (Smith Geothechnical, Fort Collins), has completed the Feasibility Study. The study includes an assessment of alternatives available for rehabilitation of the Knoth Reservoir Dam.