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I I I I I I I I I I I I I I I I I I I Pressurized Transmission System Conce~ Transmission System Overview A pressurized irrigation transmission system is proposed to provide irrigation water uon_ demand" throughout the Highland Ditch secondary supply service area. As the service area develops, landscape irrigation water will be needed throughout the area, A network of raw water storage reservoirs, pump stations and pipelines are conceptualized to provide the water required for the service area. For this feasibility study, the Board of Directors envisioned two major phases based on the known and anticipated development plans in the area. The first Phase, Phase I, is anticipated to be a 3-mile radius circle, centering on Highway 66 and 1-25. Phase II is anticipated to be about a 3-mile radius area on the northern end of the service area, just south of Johnstown and Milliken. Additionally, smaller phases would cover the outlying areas to the west (Phase III) and to the east (Phase IV). The total irrigated acreage for the secondary supply system was determined to be approximately 4,375 as described previously in this study. Phase I includes 1,400 acres or irrigated area, Phase II includes 1,250 acres of irrigated area, Phase III includes 1,300 acres of irrigated area, and Phase IV includes 450 acres of irrigated area. Two storage reservoirs and two pump stations are proposed to service the landscape demands throughout the area, Currently, the Highland No.3 Reservoir, which is located near the southwest corner of Highway 66 and 1-25, is envisioned as the first reservoir on the system for Phase I. This reservoir is fully owned by the Highland Ditch Company. Utilizing the existing reservoir is a logical component to this system because it is at the heart of the development in Phase I, is owned by the Company, and has established storage rights. The second proposed reservoir, which does not currently exist, is near the center of Phase II at the head of the Erkenbeck Lateral. This location is conceptual and the actual site conditions and land acquisition potential will determine the final location. If possible, existing storage facilities in the area should be used to reduce the capital cost of constructing a new reservoir. Arrangements with landowners should be investigated during the next phase of planning for the secondary supply system, The new reservoir and both pump stations have been preliminarily sized based on the water requirements of the system. Typically, for secondary supply systems a temporary storage volume of 3 to 5 days is recommended, For this system, a 3-day storage capability is recommended to provide adequate water from each pump station. To accommodate approximately 106 acre-feet of water each day, the total water storage is approximately 320 acre-ft. Highland No, 3 Reservoir has two decrees for a total of 1,558 acre-ft. The new reservoir is proposed to contain three days of storage for Phases II, III, and IV, which is approximately 220 acre-ft. Depending on the available, existing storage sites in the vicinity, less storage could be acceptable as long as Phase I and Phase II were connected so Highland No, 3 Reservoir was available also. Aqua Engineering, Inc. November 8, 2004 Canal Modernization Feasibility Study - 14-