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<br /> Executive Summary
<br /> This project develops base water use fun:casls for the City of Redwood City (RWC) for
<br /> the period 2000 to 2020. The forecasts can be used for a variety of water pllllIl1ing
<br /> aclivities including:
<br /> . Assessing the merits of an expanded %\:Cycled water system in Redwood Shores
<br /> and subsequent proposed phases in otheran:as
<br /> . Updating elements ofRWC'sUrban Water Management Plan
<br /> . Establishing a continuing nexusbetwClCn water supply planning and RWC's
<br /> General Plan
<br /> . Developing base waler usecbaracteristicsfur potential rates and charges.
<br /> The water use: forecasts are comprised ofsevcn separate forecasts made for the following
<br /> user sectors: single family, multiple family, commercial, commen:ialirrigation.
<br /> municipal, other, and residcntialirrigation. The forecasts made forea.ch of1hese sectors
<br /> make use of forecasts ofkey data driYm. The data drivers are number of housing units
<br /> for the residentia1sedots. number of employees fur the comme:rciaIsectoIS, and
<br /> population for the othersectms. Thcsedata drivers are multiplied bywatcr ~
<br /> coefficients, based on historical water use correlations, to obtain the water uscfoxecasts.
<br /> Results are summarized in Exhibits 1 and 2. HOlding other factorsCODStant, wtal'water
<br /> use is expected to increase from 13,170 acrc.feet per year (AFY) in 2000 to 15,520 MY
<br /> in 2020. This is a 17.8% increase over the 20 years that tranSlates into an annualllVerage
<br /> 0.82 percent increase. Factoring in passive water conservationfromnatuIal replacement
<br /> of toilets and clothes washers with more efficient technologies decreases the 2020
<br /> forecast by 703 AFY to 14,817 AFY. This translates into a 0.59 annual average increase
<br /> over the 20 years.
<br /> EXhibit 1. Base Water Use Forecast In Aere-Feet per Year (AFY) i
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<br /> Actual FOn(a$l Year
<br /> DeacriptlOD 1000 ZOOS 2010 2015 2020
<br /> Existing Customers 12,S96 12,S96 12,596 12,596 12,596
<br /> New Customm 0 513 1.386 1,962 2,328 ,
<br /> New and ExillllD2 Cllstomen 12.5% 13,109 13,981 14,558 14,923
<br /> Unaccounted for Water 574 524 559 582 597
<br /> Total Witbo1ll c:omerv.tion 13.170 13,633 14,S41 15.140 15,520
<br /> Total witb Passive C~Ol1 13.170 13,467 14.191 14.590 14.817
<br /> The base water use forecasts do not factor in additional water savings that could be
<br /> achieved througltactivewater conservation programs. RWC's Urban Water Management
<br /> Pllm addresses potential savings from water conservation "Bm Management Practices"
<br /> (BMPs). The forecasts generated here are used as the base case scenario for that plan.
<br /> The 0.59 rate of future growth in water use is less than thatexpericnced by RWC in the
<br /> past. From 1975 to 2000, the annual average rate of irowth WlI5 1.3 percent, largely a
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