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<br />.. . - . <br />J <br /> C()nstmcljoll as part of the Energy Policy Act of 1992. In 1994lbe oldèr tonets were no <br /> longer manufactUred on a national level and ULFT penetraljon ha& been increasing since. <br /> Engineering changes have also improved the water and energy efficiency associated with <br /> clothes washèt'S. Over the last five years, this efficiency hàs been associated with <br /> horizontal axis washers. altboughother lùgh.efficiency alternatives are also evolving. A <br /> Federal codecbange hils mandated lùgh-efficìency clothes washer be the only prooU(:t <br /> sold by 2007. <br /> Appendix B shows the residential water use coefficients, as well as the estimated <br /> penetration rates and water savings associated, witilULFTIi and lùgh-efficíency clotiles <br /> washers for tile residential sectors. The CUlTent penetration rates are estinlsted lÌ'om Ii <br /> water conservation baseline penetration study recently completed by East Bay Municipal <br /> Water District (2001). Future penelratìon ra!l!s are based on ex.pected natura! rates of <br /> replacement. RWC could accelerate t:besc reþ]aooment rates via water conservation <br /> programs and incentives. RWC is currently participating in a high-efficiency washer <br /> rebate program through the Bay Area Water Users Association.. Thisacceleœtion is not <br /> factored into Ibe base water use forecasts generated in tilis study. It is included. in <br /> sensitivity analyses described in SectionS. <br /> Appendix C shows estimated water savings associated with ULFT instalJation at <br /> conun.",ial sites. It shows lb. universe of toilets installed at commðrcia! oj res withîn lb. <br /> city as of I 992, along with water savings and penetratÎön rate assumptions. <br /> 4. Water Use Forecasts <br /> Water use forecasts ate 8e1ienúed for a ~ven year by multiplying Ibe relevant data driver <br /> by its water ~ coefficient. Appendix D shows Ibe results. These forecastssbould be <br /> intetpreted as expected "nonnal" year forecasts. Weather, pricing, water-use <br /> intensification, conservation,and data driver vari1lÛonscana1ter thesecxpected values as <br /> discnssed in the next section. <br /> Water tõr«asts are de\'eloped by sector. They are comprised of sub-foreca$ts made for: <br />. existing usClSa,sof20Q0 <br />. new users after 2000, and <br />. water conservation occurring from natural replacement of water fixtures. <br /> For .xisting users, Ibe forecasts assmne that the íneJoQr and outdoor water use patterns <br /> c"perienced in 2000 wi!! remain constant, except for the explicit accounting for water <br /> coœervation occurring from naturalreplacemcnt of water ft"tures. For new single-famìly <br /> customers, the 2000 water use coefficients are used as deri vedfrom homes built between <br /> 1993-2000 as they are deemed to be the most representative of tho future. For the new <br /> multiple family customers, we USe the coefficientS associated with sites with over 2S <br /> dwelling units; most ifnot all new multiple family growth is expected by theRWC <br /> Planning Department to be large-scale ptojects. <br /> Page 6 <br />