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<br /> - <br /> -_.~~.-- " ",_.,,,,"0',.,",",,,,,,,,,, ,,,,,,,,~,)'~_",,,~" <br /> I 5. \ ~- 31 <br /> A'l'TAC:JDIEIft 1 D 1 <br /> Technical~e~oranduID <br /> To: Peter Ingram, RWC Pubiic Works Services Director <br /> From: John ,B. Whitcomb, PhO, Consultant <br /> Date: August 15,2002 <br /> Subject: RWC Water Supply Reliability <br /> This technical memorandUn:l presents my analysis of the water SUPplYlUld demand balance for <br /> the City of Redwood City (RWC) water system. Asscssingwater demand/supply reliability can <br /> be useful in supporting a variety of water plimning functions including: <br /> o Assessing the meritS tif an expanded recycled watet,system in RedwoodSbores and <br /> subsequent proposed phases in the Greater Bayfrollt and Central Redwood City. <br /> o Determining thuvailability of watu for new developments under new state laws adopted <br /> via Senate Bills 221 and 610. <br /> 0 Assessing the need for expanded water conservation programs and/or other new water <br /> supplies. <br /> o 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 rour sections: <br /> 1. SFPUC water supply <br /> 2. RWC Water demand <br /> 3. Reliability: tbewater supply lIl1d demand balance <br /> 4. Selecting a proper level of reliability <br /> 1. SFPUC Water Supply <br /> R WC currently purchases 100% of its potable water supplies from the S/Il1 Francisco Public <br /> Utilities Commission (SFPUC). The SFPUC serves as a wholesalerofwatcrfrom the Hetch <br /> Hetchy Water /Il1d Power System. To quantify the future reliability of water supplies from this <br /> source, I coosulted the following three solJICes of information: <br /> lJ San Francisco Public Utilities Commission (SFPUC) Water Supply Mastel' Plan. April <br /> 2000. <br /> ~~"'''-,..".."" <br />