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Indoor Conservation Potentia <br />Even without a concerted effort on the part of homeowners Figure 7. Indoor average gallons per <br />to switch to more efficient appliances and fixtures, reductions capita per day, REU1999, REU2016, <br />are anticipated as old toilets and clothes washers wear out <br />and are replaced. The current average daily indoor per <br />household use of 138 gphd is expected to reduce to 110 gphd. <br />Per capita use of 58.6 gpcd is expected to reduce to 36.7 gpcd <br />in the coming years. <br />Further reductions are anticipated as customer side leakage <br />is reduced (through automated metering and leak alert <br />programs) and through on-site reuse. There are many <br />variables that contribute to indoor water use patterns, such <br />as the age of the fixtures and appliances, the age of housing <br />stock, and the frequency of remodeling. Utilities should <br />determine appropriate efficiency targets for their own service <br />area based on local factors. <br />Outdoor Conservation Potentia <br />High Efficiency Studies <br />To.o ......... ......... ......... <br />60.0 _.. • • ......... ......... <br />50.o -.. ........................ <br />40.0 -.. ........................ <br />30.0 -- <br />20.0 _..... ...... <br />10.0 -..... ...... <br />0.0 ...... ........ ....... <br />REU1999 REU2016 High Efciencv <br />QD Oreo efa1. 2011) <br />There are a number of common strategies to maximize outdoor efficiency. Utilities should encourage <br />excess irrigators to be more water -efficient for example by using irrigation controllers that are activated by <br />environmental conditions, rather than timers. Utilities can also help customers set up irrigation controllers <br />correctly, and encourage them to use plant materials suitable to the local conditions. Deficit irrigators (those <br />using less than the theoretical irrigation requirement) should be prevented from increasing their irrigation in <br />the future. <br />If excess irrigation could be eliminated in the Landscape Group, the average outdoor use would drop by <br />8.2 kgal per house, or 16 percent. <br />RESIDENTIAL END USESOF WATER, VERSION 2: EXECUTIVE REPORT 1 11 <br />