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<br /> J . , , ,. - <br />" <br />I <br /> 2. Water Use Drivers <br /> Data drivers for each water use g,ootor are defineð in Exhibit 3. <br /> Exldblt 3.. Water Use Driven by Sel:tor <br /> WatetUseSeetôr Water Use Driver Sourœ <br /> Single FamìJy Number of single famìJy RWC Housing Element, <br /> dwellil11! units 1999"2006 <br /> Mu1tìple Family Number of multiple farnìJy RWC Housing Element, <br /> dwelling units 1999-2006; RWe Planninl! <br /> Commercial Numb.,.- ofl';[I)nlovees ABAG <br /> Cammcrciallni.zalian Number afemnlavees ABAG <br /> Government Pooulatian ABAG <br /> Other Ponulatiall ABAG <br /> Reside:ntiallnigation Number ofmwtiple family RWC HQUsingElement, <br /> dwellin2 units 1999-2006: RWC Planninl! <br /> The values .of these data drivers are shown in ApPendix A in ,-year increments over the <br /> forecast period. Tbese dwelli¡¡g unit, employee, and populatian estim.ates. are the best <br /> cum:nt infonnation available. They can and should be updated as expectations .of future <br /> cirtumslances cbange. <br /> For the single-family residentùll class, dwelling units are segmented into six categories <br /> b¡¡seð on the year the dwelling unit was constructed. Waler use pattemsareknown t.o <br /> vary with vintage based an factors such as water flJcture efi'iciencyand si:r,eoflandscape. <br /> We .obtained year builtbyabtaÌ1'1ing tax assessor information !tOm San Mateo County <br /> and linking tbisinfo1'ltlati9Íl with the water use billingdJltaviaparcel number. We <br /> defined the categories, partly, tam.atch the years associated with key plumbing code <br /> changes. <br /> Far the multiple-family resi.dential çJa.ss. dwelling units are segmented into three <br /> categories based on the number of dwelling. units at a site. The categories include homes <br /> with 2 t04. 5 to 25, and over2S dweilingunits. WâterusepattemJI are known to vary <br /> with the number of units at â si!chased an factors relating to demogr¡¡phics and <br /> landscapios- We were not able to obtain year built information fur each account in this <br /> sectar. <br /> 3. Water Use Coefficients <br /> The water use coefficients are based on analysis of historical wale!' use billing records. <br /> The coefficients mírrorthe water use driver ftamework. We investigated adjuslÍng the <br /> coefficic:nts.for weather, water prices. and wata conservation technologi.es. The sectiOIJ ¡ <br /> below describe how the coefficients are adjusted for each. <br /> Page 4 <br />