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construction as part of the Energy Policy Act of 1991 In 1994 the older toilets were no longer manufactured on a national level and ULFP penetration has been increasing since. Engineering changes have also improved the water and energy efficiency associated with Clothes washers. Over the last fin years, this elSciencylim beet associated with horiwntal axis washes, although other high- effrciracy ahemative MO also evolving. A Federal code change bas mandated Irish - efficiency cludics washerbe the only product sold by 2007. Appendix B shows the residential water use coo icients, as well as the estimated penetration rates and water savings associated with ULFTs and high- efficiency clothes s washers for the residential sectors. The current penetration rates are estimated tiom a water conservation baser penetration study recently completed by Isaat Bay Municipal Water District ( 2001). Future penetration rates are based on expected natural rates of replacement RWC could accelerate these replacement rates via water conservation programs and incentives. RWC is currently participating in a high ePHejency washer rebate program through the Bay Area Water Users Association, This. acceleration is not factored into the base water use forecasts generated in, this study. It is included in < sensitivity analyses described in Section S. Appendix C shows estimated water savings assocated with ULFT installation at commercial sites. It shows the universe of toilets installed at commercial sites within the city as of 1992, along with water savings and penetration no assumptions. 4. Water Use Forecasts Water use forecasts are generated for a given year by multiplying the relevant data driver by its water use coefficient. Appendix D shows the results. These forecasts should be interpreted as expected "aortal" year forecasts. Weather, pricing, water -use intensification, conservat ion, and data driver variations can alter these expected values as discussed in the next section. Water forecasts are developed by sector. They are comprised of sub - forecasts made for • existing users as of 2000 • new users after 2000, and • water conservation occurring from natural replacement of water fixtures. For existing users, the forecasts assume that the indoor and outdoor water use patterns experienced in 2000 will remain constant, erupt for the explicit accounting for water conservation occurring from natural replacement of water fixtures. For now single - family customers, the 2000 water use coefficients are used as derived fiom homes built between 1993 -2000 as they are deemed to be the most representative of the future. For the new multiple family cnstomas, we use the.coefHraenta associated with sites with over 25 dwelling units; most if not all flew multiple family growth is expected by the RWC Planning Department to be largFSCale projects. Page 6