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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 />Water Storaae and Pumpina Components <br /> <br />Three new storage reservoirs and four new pump stations are conceptualized to service <br />the landscape irrigation demands to the south of the railroad tracks. The new reservoirs <br />and pump stations have been conceptually sized based on the anticipated water <br />requirements presented in this report. In addition, two existing reservoirs are located on <br />the southern edge of town that will be utilized for secondary supply water storage. The <br />reservoir and pumping station at the Elks Golf Course will remain operational to service <br />the irrigation system at that site. The secondary supply pipe network will be sized to <br />accommodate the water demand for the golf course as well. <br /> <br />/ <br /> <br />Reservoirs are proposed at the following locations: one in the existing drainage basin at <br />Willow Creek Park, one adjacent to the existing baseball complex pumping station at <br />Fifth Street and the Fort Bent Canal, the existing storage ponds at the south end of the <br />City, and one to the west of Fourteenth Street adjacent to the Fort Bent Canal. <br /> <br />Expansion of the three existing well water sources is envisioned to service the <br />landscape irrigation needs to the north of the railroad tracks. Based on information <br />provided by the City, there are existing wells at the following three locations: east of <br />Riverside Cemetery, at the Riverside Park site, and at the Escondido Park site. <br />According to Dannie MacMillan, the combined flow from the existing wells is <br />approximately 300 GPM, which is not sufficient to service the anticipated demand of the <br />City's landscape irrigation systems north of the railroad tracks. New wells will need to be <br />drilled, and new water storage facilities and pumping systems developed to <br />accommodate the demand of the secondary supply system. <br /> <br />Tvpical Pond Characteristics <br /> <br />The estimated capacity of the storage facilities was assumed to be equal to three times <br />the peak season daily irrigation water requirement at each respective pump station. <br />Calculations for the storage facilities presented in Table 7 were based on a total pond <br />depth of 10 feet, 4(horizontal): 1 (vertical) side slopes, 1-foot of freeboard, and 5 feet of <br />lining material for the anchor trench. Each pond was assumed to be circular. <br /> <br />Based on information obtained from the City, soil textures in the vicinity of the proposed <br />storage facilities are mostly sand with a few locations exhibiting clay soil textures. <br />Because water infiltrates faster in coarse textured soils such as sand and because there <br />is some concern regarding the shallow ground water aquifer underlying the City, storage <br />facilities should be lined. Soils near the proposed Willow Creek storage facilities are <br />believed to be clay and therefore may/not require lining material. <br /> <br />The preferred storage facilities for this project are excavated ponds, which include a 30- <br />mil PVC liner, 8-ounce geotextile fabric, and 12-inches of soil backfill above the lining <br />system. A 12-inch depth of soil over the geotextile is required to protect the liner system <br />and to create a natural appearance. While there are no particular depth requirements for <br />these storage facilities, the side slopes of the pond should not be steeper than 4H:1V for <br />safety and liability concerns. <br /> <br />Aqua Engineering, Inc. <br />and Colorado State University <br />May 19, 2004 <br /> <br />Secondary Supply Feasibility Study <br />-25- <br />