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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Pressurized Transmission System Conce~ <br /> <br />Transmission System Overview <br /> <br />A pressurized irrigation transmission system is proposed to provide irrigation~ater "on- <br />demand" throughout the Lower Boulder service area. As the service areacevelopsand <br />~- <br />builds out, landscape irrigation water will be needed throughout the area. A network of <br />raw water storage reservoirs, pump stations and pipelines are conceptualized to provide <br />the water required for the service area. <br /> <br />t <{ v-<. Iv '( ) <br />I <br /> <br />Three storage reservoirs and three pump stations are proposed to service the landscape <br />demands throughout the area. Currently, the Panama Reservoir is envisioned as the first <br />reservoir on the system and is located near the headworks of the canal. This reservoir is <br />used / owned by Boulder White-Rock Irrigation Company and an agreement between <br />the two companies is needed for Lower Boulder to operate out of this reservoir. <br />Physically, water could be transferred into Panama Reservoir from Lower Boulder's C- <br />BT shares through existing reservoir water conveyance structures. Utilizing the existing <br />reservoir is a logical component to this system and it is recommended that this <br />arrangement be discussed. <br /> <br />If Panama Reservoir is not utilized for the Lower Boulder system, a new reservoir near <br />the head of the canal system is envisioned. Two additional reservoirs are proposed: one <br />near the center of the existing system, near the southeast corner of 1-25 and Highway <br />52, and one near the Coal Ridge Ditch in the northeast corner of Frederick. These <br />locations are conceptual and the actual site conditions and land acquisition potential will <br />determine the final locations. <br /> <br />The new reservoirs and pump stations have been preliminarily sized based on the water <br />requirements presented previously. Typically, for secondary supply systems a temporary <br />storage volume of 3 to 5 days is recommended. For this system, a 3-day storage <br />capability is recommended to provide adequate water from each pump station. To <br />accommodate approximately 55 acre-feet of water each day, the total water storage is <br />165 acre-ft. The three reservoirs and three pump stations are proposed to be equal in <br />size since they are located at the start, middle, and end of the service area. Therefore, <br />each reservoir would store approximately 55 acre-feet. <br /> <br />A pipeline network was developed to cover all areas of service. This "transmission <br />network" is conceptual in order to understand, at this level, how much pipe may be <br />needed and where it would be installed. Actual pipe routing and sizing would be <br />determined during preliminary design and final design phases for construction <br />documents, Where possible, the new pipe should be laid in the existing canal. This helps <br />keep construction costs down because excavation isn't necessary. However, if the open <br />ditch is desired to remain unaffected to accept storm water discharges, then the pipe <br />should be laid adjacent to the ditch, where possible, since easements and access <br />already exist. Figure 2 shows the conceptual pressurized transmission system described <br />in this report including reservoir locations and the transmission pipe. <br /> <br />Aqua Engineering, Inc. <br />June 2004 <br /> <br />Canal Modernization Feasibility Study <br />-10- <br />