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ATnCMUXT 'D1 <br />Technical Memorandum <br />To: Peter Ingram, RWC Public Wedcs Services Director <br />From: John B. Whitcomb, PhD, Consultant <br />Date: August 15, 2002 <br />Subject: RWC Water Supply Reliability <br />This technical memorandum presents my analysis of the water supply and demand balance for <br />the City of Redwood City (RWC) water system, Assessing water demarNsupply reliability can <br />be useful in supporting a variety of water planning functions including. <br />• Assessing the merits of an expanded recycled water system in Redwood Shows and <br />subsequent proposed phases in the Greater Bay6ont and Central Redwood City. <br />• Determining the availability of water for new developments trader new state laws adopted <br />via Senate Bills 221 and 610. <br />o Assessing the need for expanded water conservation programs and/or other new water <br />supplies. <br />❑ Understanding and developing drought response actions to match the risk accepted by the <br />City in purveying water to its customers. <br />The discussion of water supply reliability is described in following four sections: <br />1. SFPUC water supply <br />2. RWC Water demand <br />3. Reliability: the water supply and demand balance <br />4. Selecting a proper level of reliability <br />1. SFPUC Rater Supply <br />RWC currently purchases 1001/6 of its potable water supplies from the San Francisco Public <br />Utilities Commission (SFPUC). The SFPUC serves es a wholesaler of water from the Retch <br />Hetchy Water and Power System. To quantify the future reliability of water supplies from this <br />source, I consulted the following three sources of information: <br />o San Francisco Public Utilities Commission (SFPUC) Water Supply Master Plan, April <br />2000. <br />