AgdaPkt 2003-09-08 - Laserfiche WebLink

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. �T 1 C- I( Executive Summary This project develops bas.: water use forecasts for the City of Redwood 'my (RWC) for the period 2000 to 2020. The forecasts can be used fora variety of water plamling activities including: • Assessing the merits of an expended recycled water system in Redwood Shorts and subsequent proposed phases in other area • Updating elements of RWC's Urban Water Management plan • Establishing a continuing nexus between water supply planning and RWC's General Plan • Developing base water use characteristics for potential rates and charges. The water use forecasts are comprised of seven separate forecasts made for the following tier sectors: single family, multiple family, commercial, commercial irrigation, municipal, other, and residential irrigation. The forecasts made for each of these sectors make use of forecasts of key data drivers. The data drivers art number ofhousiog units for the residential sectors, number of employees for the cotrmrercW sectors, and population for the other sectors. These data drivers are multiplied bywater use coefficients, based on historical water use correlations, to obtain the water use forecasts. Results are summarized in Exhibits 1 and 2. Holding other factors constant, total water use is expected to increase from 13,170 acre-fact per year (AFY) in 2000 to 15,520 AFY in 2020. This is a 17.8% increase over the 20 years that translates into an annual average 0.82 percent increase. Factoring in passive water conservation from natural replacement of toilets and clothes washers with more efficient technologies decreases the 2020 forecast by 703 AFY to 14,917 AFY. This translates into a 0.59 annual average increase over the 20 years. Exhibit 1. Base Water Use Forecast in Acre -Feet per Year (AFY) I Actual Foreegl Year (Description I 2000 2005 I 2010 2015 I 2020 IEzisting customers 12,596 12,5% ' 12,5% 12.5% 12,5% New Customer 0 S13 I 1,386 1,%2 2 New and Existing Customers I2.596 13,109 13,991 14,558 14,923 (Unaccounted for Water 574 524 559 582 1 597 (Total without Conservation i 13,170 13,633 14 15.140 15.520 Total with Passive Cotsavadon i 13.170 13p67 1 14,191 14.590 14.817 The base water use forecasts do not factor in additional water savings that could be achieved through active wan conservation programs. RWC's Urban Water Management Plan addresses potential savings from water conservation 'Bcat Management Practices" (BMPs). The forecasts generated here am used as the base case scenario for that plan. The 0.59 rate of future growth in water use is less than that experienced by RWC in the past. From 1975 to 2000, the anneal average rate of growth was 1.3 percent, largely a Page i