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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 />60,000 gallons for the residential fire volume and the residential <br />average day demand of 181,250 gallons. It would be a conventional <br />cylindrical steel ground level tank. In addition to providing an <br />emergency water supply for the South Rifle Division, it would provide <br />the necessary regulation for the diurnal fluctuations in instantane- <br />ous demands on the water system. <br /> <br />The water supply trunk pipeline between the treatment plant and the <br />connection to the distribution system near the Southside Center <br />would carry a maximum flow of 700 gpm. This section of the trunk <br />line would be 8-inches in diameter which was adopted as the minimum <br />size pipe for trunk supply mains. The trunk pipeline between the <br />distribution system connection and the storage tank was sized for a <br />flow of 4,000 gpm which is the maximum fire flow rate for the system <br />(3,500 gpm) plus the peak hourly demand for the system (1,200 gpm) <br />less the flow supplied by the treatment plant (700 gpm). A pipe size <br />of 14 inches was selected for this portion of the trunk supply main <br />in order to limit the friction losses in the pipeline to an acceptable <br />level. Friction losses in the trunk supply pipeline under the maximum <br />design flows would be 0.8 feet per hundred lineal feet in the 8-inch <br />diameter pipeline and 1,81 feet per 100 lineal feet in the l4-inch <br />diameter pipeline at their maximum design capacities. The costs of the <br />pipeline given in the next chapter are for Class 150, cement mortar <br />lined, ductile iron pipe. <br /> <br />The intake structure, river pumping station, water treatment plant and <br />treated water pumping station will all be located within the inter- <br />mediate regional (lOa-year) flood plain as determined by a U. S, Corps <br />of Engineers study.lI The approximate limits of the Intermediate <br /> <br />l/ Flood Plain Information - Colorado River and Rifle, Government, <br />and Hubbard Guloh Creeks - Rifle, Colorado; Department of the <br />Army, Sacramento District Corps of Engineers, Sacramento, <br />California, April 1973, <br /> <br />V-7 <br />