Centennial WSD 1996 WCPlan - Laserfiche WebLink

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1 I ] 1 _J I 1 I I I I I I I I ~ j I I 5-5 Recently, the District undertook a random survey of residential customers that covered water service, conservation, and current water-use practices. The survey results are presented later in this chapter. Ordinances, Rules, and Regulations. Since its inception, the District has required developers to utilize low water-use plumbing fIxtures in all single- and multi-family housing developments. Considerations for additional and regulations are considered later in this chapter. Service Pressure Regulation. By installing individual pressure-reducing devices in homes served by high pressure lines, the District conserves water and extends the life of pressure-sensitive fixtures and appliances while not compromising fire flow capacities in the neighborhood. Service pressures are limited to 65 psi, which can reduce water use by 6 percent compared to high-pressure services without reducers. The likelihood of leak-producing "water hammer," dish and clothes washer noise, and fIxture breakdown is greatly reduced. Water hammer is the surge effect caused by quickly closing a faucet or valve on a high pressure line. It produces a loud thumping noise and creates stress on pipes, joints, fixtures, and appliances. Systemwide Audits. In addition to the distribution system leak detection and repair program, the District employs an increasingly sophisticated methodology for their systemwide water audits. Through these audits, District staff examine water production and customer meter records to identify all system uses and to determine the percentage of unaccounted for water loss. The District accounts for water production and use through metering of: · Raw and treated surface water supplies · Well supplies · All residential, commercial, and industrial taps · Metropolitan Districts I and 2 irrigation taps _. _ _ _ _ ~C9~~t:!"t!~t!on w-.atec _ _ - - - - - - - - - - - - - - - -- · Commercial/industrial wastewater flows · Wastewater plant influent and effluent In addition, billing records are sorted and analyzed by customer class. The annual analysis of system water production and use for 1987 through 1991 is provided in Table 5-2. The District has averaged about 6 percent unaccounted for water use in the past 3 years. Based on a study completed in 1982, unaccounted for water in California cities averaged about 9.5 percentl. Utilizing better data management techniques, the District will continue to focus on decreasing their unaccounted for water as a percentage of total water demand. I 'Municipal Loss Reduction, " prepared by Boyle Engineering for California Department of Water Resources, Sacramento, California, August 1982. 21-6657