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Treated Water System Denver Water serves treated water to the City and County of Denver and 7S suburban distributors, Denver delivers treated water to 2S0,000 accounts and approximately 1.2 million persons, About 52 percent ofthe accounts are within the City of Denver, Denver Water's treated water facilities include: · The Foothills, Marston, and Moffat treatment plants, with capacities each of2S0, IS5, and ISO million gallons per day (mgd), respectively, The plants have a combined capacity of 645 mgd, · 17 pump stations with a pumping capacity of 1,053 mgd. · 30 treated water storage reservoirs in 16 locations totaling 344 million gallons. · 2,474 miles of pipe; 39,500 valves; and 14,000 hydrants, On average, Denver Water customers currently use about 220 mgd. Winter demand is about 120 mgd, while water consumption on a peak summer day may exceed 500 mgd, The Foothills and Marston treatment plants treat water from the South Platte Collection System and Roberts Tunnel Collection System, while the Moffat Treatment Plant treats water from the Moffat Collection System. The system is integrated and connected such that water from any of the three treatment plants could provide service to most areas within the CSA during periods of low demand, In general, the Foothills Treatment Plant is "base loaded," or relied on as the first treatment plant used to meet treated water demands, because of its lower cost of operation and ability to provide for much of the areas Denver Water serves by gravity, The Marston Water Treatment Plant and Moffat Water Treatment Plant are used as peaking plants, with priority determined by supply considerations and cost of operation. From the treatment plants, main conduits deliver water either directly into the distribution system or to pump stations and clear water storage reservoirs. These pump stations and reservoirs deliver water to the distribution system, which is divided into about 160 pressure zones. The distribution system is generally configured so that water from the conduits is distributed into a grid of 12-inch pipe on about one-half-mile centers. The 12-inch grid, in turn, delivers water into the localS-inch and 6-inch distribution pipe. The system is designed for dual feed to any area to minimize service interruption and to maintain fire protection capability. Figure 4 shows the major treated water distribution features, Defining Future Demands in the Combined Service Area The demand forecast from the CSA defines how much additional water Denver Water will need beyond its existing supplies and when that water will be needed. Forecasting water demand is primarily a function of two variables: future demographic growth (population, households, income) within the CSA and the rates of water usage for those demographics. Growth within the CSA is derived from regional demographic forecasts, along with estimates of where metro area growth will occur. The usage relationships emerge from detailed analysis of historical water usage patterns, Denver Water 12 C:\Documents and Settings\vyp\Local Settings\Temporary Internet Files\OLKI50\MoffatSystemlO0603.doc