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. II ,. - II I Executive Summary Thi~ project develops base water use forecasts for the City of Redw()od City (RWC) for the period 20'0'0' to 2020'. The forecasts can be U5'ed f()r a variety of water planning actívíties including: . Asses~ing the merits of an expllllded reçycled water system in Redwood Shores and subsequent proposed pbasiSin o!ber areas . Updating elements ofRWC'~ Urban Water Management Plan . Establishing a col!tÎnuing nexus between water supply planning IUId II. WC's General Plan . Developing base waler use ob,a:racleristic~ for potentia! rateS and charges. The water u~e forecasts are comprised of seven separate forecasts made for !be following user stelors: single family, multiple family, commercial, conune:rolal irrigation, municipal, other, and resldentíaJ irrigation. The forecasts made fOt each of these sectors make use of forecasts ofj:ey data drivers. The data drivers: are mJIDber of housing units for the residemial~ectors, nunibêr of employee~ for the commercical sectors, and population for the other sectors. These data drivers are multiplied 1:IY water use coefficientS, ba.'!ed on hi~lorica1 water u~ecorrelations, to obtain the water use forecasts. Results are summarized in ExhibÎls 1 and 2. Holding other factors constan!, total water use i~ ~ec~ to incrCa.se from 13,170 acre-feet per year (A.FY) in 2000 to 15,520 AFY in 2020. Tbisis a 17.8% increase over the 20 years that translates inJoan annuøJ average 0.82 percent increase. Factoring in pas~ivewater col1Servation ftom nati.U'al replacement of loilets and clothe~ washen with more efficient technologies decreases the 20'20' forecast by 703 .AFY to 14,817 MY. This translates into a 0.59 annual average increase over the 20' years. ExhibIt 1. Base Water Use Forecast In Acre-Feet per Year (AFV) " I A"tUai I Fo.""",.! Yeas' i'öžõl Ð....;ptJoø 1000 20OS 10tO 10t5 Existing Cut!omc¡¡ 12,5% 12,5% 12596 12,,596 12,5% 1 New Cll$lomcrs 0 513 1,386 1,962 2,328 New and Exist;"2 Cutto",en 12.596 13,109 13,981 14558 14,923 U"""""""tedfórWatcr 574 524 5S9 582 597 TQtálWithoui CMserv,üoo 13,170 13,633 14,541 15,140. 15,s20 Total with. Passive C._MÜon 13.170 J3,~67 14,191 14.590 I 14.817 The base water use forecasts do not factor in additional water savings that could be achieved through active water conservatìon programs. RWC's Urban Waler Mana~ent Plan addre:ssespotentiaJ savings from water conservation "Best Management Practices" (aMPs). The forecasts. genera~ here are used as the base case scenario for that plan. The 0.51) rate offumre growth in water use is Jess than that experienced by RWC in the plLSt. From 1975 to 2O'GO, the annual averáge rate of growth was 1.3 percent, largely a Page I