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2015 URBAN WATER MANAGEMENT PLAN <br />3.2 Imported Water <br />The City supplements its water supply with imported water purchased from Metropolitan. Metropolitan's <br />principal sources of water are the Colorado River via the CRA and the Lake Oroville watershed in <br />Northern California through the SW P. The water obtained from these sources is treated at the Robert B. <br />Diemer Filtration Plant located north of Yorba Linda. Typically, the Diemer Filtration Plant receives a <br />blend of Colorado River water from Lake Mathews through the Metropolitan Lower Feeder and SWP <br />water through the Yorba Linda Feeder. The City currently maintains seven imported water connections to <br />the Metropolitan system. <br />3.2.1 Colorado River Supplies <br />The Colorado River was Metropolitan's original source of water after Metropolitan's establishment in <br />1928. The CRA, which is owned and operated by Metropolitan, transports water from the Colorado River <br />to its terminus at Lake Mathews in Riverside County. The actual amount of water per year that may be <br />conveyed through the CRA to Metropolitan's member agencies is subject to the availability of Colorado <br />River water for delivery. <br />The CRA includes supplies from the implementation of the Quantification Settlement Agreement and <br />related agreements to transfer water from agricultural agencies to urban uses. The 2003 Quantification <br />Settlement Agreement enabled California to implement major Colorado River water conservation and <br />transfer programs, stabilizing water supplies for 75 years and reducing the state's demand on the river to <br />its 4.4 MAF entitlement. Colorado River transactions are potentially available to supply additional water <br />up to the CRA capacity of 1.25 million acre-feet (MAF) on an as -needed basis. Water from the Colorado <br />River or its tributaries is available to users in California, Arizona, Colorado, Nevada, New Mexico, Utah, <br />and Wyoming, as well as to Mexico. California is apportioned the use of 4.4 MAF of water from the <br />Colorado River each year plus one-half of any surplus that may be available for use collectively in <br />Arizona, California, and Nevada. In addition, California has historically been allowed to use Colorado <br />River water apportioned to but not used by Arizona or Nevada. Metropolitan has a basic entitlement of <br />550,000 AFY of Colorado River water, plus surplus water up to an additional 662,000 AFY when the <br />following conditions exists (Metropolitan, 2015 UWMP, June 2016): <br />• Water unused by the California holders of priorities 1 through 3 <br />• Water saved by the Palo Verde land management, crop rotation, and water supply program <br />• When the U.S. Secretary of the Interior makes available either one or both: <br />o Surplus water is available <br />o Colorado River water is apportioned to but unused by Arizona and/or Nevada <br />Unfortunately, Metropolitan has not received surplus water for a number of years. The Colorado River <br />supply faces current and future imbalances between water supply and demand in the Colorado River <br />Basin due to long term drought conditions. Over the past 16 years (2000-2015), there have only been <br />three years when the Colorado River flow has been above average (Metropolitan, 2015 UWMP, June <br />2016). The long-term imbalance in future supply and demand is projected to be approximately 3.2 MAF <br />by the year 2060. <br />arc dis.wm &VK T36 3-2 <br />