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.1 ,;~ II COLORADO WATER CONSERVATION BOARD Windsor Reservoir and Canal Company Douglas Reservoir Rehabilitation January, 1991 Introduction Douglas Dam is located in Larimer County on Dry Creek, a tributary to Cache La Poudre River. The Reservoir stores 8,800 acre feet of water. The Reservoir is owned by the Windsor Canal & Reservoir Company, and the water is used to help irrigate 55,000 acres of farm land in Larimer and Weld Counties, Colorado. Problem In the spring of 1990 seepage developed on the downstream- slope immediately above the outlet works. Previously the Colorado State Engineer's office had advised the company that the spillway needed enlargement to accommodate 75 percent PMP flood. The State Engineer's office has also advised that no water could be stored in 1991 until the seepage was addressed and resolved. The Company decided to proceed with the rehabilitation of the outlet works. and correct the spillway deficiency. Woodward-Clyde Associates was hired to perform the feasibility study in accordance with the CWCB guidelines. This study is the basis for the proposed project. Proposed Project The project proposes to remove the embankment above the outlet works. construct a slurry cut-off wall at the upstream toe near the outlet, replacement of the embankment with a chimney drain downstream and relocating and enlargement of the spillway. The total cost of this project will be $700,000. This work would be completed in the early months of 1991 before irrigation season. Proposed Financing (a) lst Plan Windsor Reservoir Company (assessment) 40 year CWCB Loan at 5 percent interest $350.000 350,000 $700,000 Under the proposed plan the Company would make 40 annual payments of $20.397 for a total repayment of $815,894.26. The State Engineer's restriction on the reservoir requires an early 3739E*