AgdaPkt 2003-09-08 - Laserfiche WebLink

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q. l C -S Figure 1. Historic and Future Water Use 15,000 14,OC 10.000 /` f ►,� � ____ -- 8.000 � l(f NWWd.Fl Foncnl 5,000 4.000 2.01' 0 1070 1815 1050 1855 1990 — 1095 2000 2005 2010 2015 2020 2025 5. GROUNDWATER 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 derived 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 section 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 identified by SFPUC. 5. With a probability of 2.5 %, the SFPUC will declare a 20% system -wide shortage resulting in a 28.4% Redwood City cutback (about one year in 40). The frequency and magnitude of these cutbacks is increasing over time. Page 5 of 8