AgdaPkt 2002-11-04 - Laserfiche WebLink

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The quantity of water received by Redwood City in prior years from existing Hetch Hetchy water supply entitlements is shown in Figure 1 (in AF/Y). This figure is reproduced from the Redwood City UWMP, and includes projected future water use. Figure 1, Hietorlc end Future Wirer Use 5. GROUND WATER ANALYSIS Redwood City does not use groundwater. There are no plans to use groundwater in the future. 6. WATER SUPPLY SUFFICIENCY Determination: Redwood City does not have sufficient water supply to meet the projected water demands of new development projects. In fact, Redwood City is actively pursuing expansion of its water supply for existing customers. Redwood City's current water supply reliability is shown in Figure 2. This figure is dedved from a technical memorandum, Water Supply Reliability dated August 15, 2002, by John Whitcomb, PhD (,Attachment 'D'). When the SFPUC declares a water shortage, Redwood City will be required to make relatively large water use cutbacks as specified in the Interim Water Shortage Allocation Plan adopted by the SFPUC and all suburban purchasers (including Redwood City) in 2001, pursuant to sectior~ 7.03(a) of the Master Water Sales Contract. Figure 2 illustrates five water cutback scenarios: 1. Most of the time, the SFPUC will not declare a water shortage. 2. Sometimes the SFPUC will declare a 5% system-wide shortage resulting in a 12.2% Redwood City cutback--the probability of this declaration was not identified by SFPUC. 3. With a probability of 7.6%, the SFPUC will declare a 10% system-wide shortage resulting in a 17.5% Redwood City cutback (about one year in 12). · 4. If the SFPUC declares a 15% system-wide shortage, Redwood City will get a 23.3% cutback--the probability of this declaration was not ident~!ed by 5. With a probability of 2.5%, the SFPUC will declare -~ 20% ~.vstem-wide shortage resulting in a 28.4% Redwood City cutback (about one year in 40). Page 5 of 9