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<br />Section 7 <br />Evaluation and Selection of Conservation Measures and Programs <br /> <br />Calculation of Water Savings <br />Per Unit (Water Savings <br />presented in this table are <br />cumulative) <br /> <br />Total Savings of <br />Program During <br />Planning Period <br />1000 GAL <br /> <br />Annual Savings in <br />2005 or at onset of <br />program4 <br />(1000 GALlYRl <br /> <br />Table 7-2 Estimated Wate <br /> <br /> <br />Annual <br /> <br />Savings <br /> <br />Assumptions <br /> <br />Average flush/person/day = 5 <br />Average people per home = 2.88 <br />Toilet prior to 1994 = 3.5 gal/flush <br />Toilet post 1994 = 1.6 gal/flush <br />17% of homes at buildout were <br />build prior to 1994 <br />Reduction factor = 50% <br /> <br />Low Usage Washer = 25 gal/wash <br />Average Washer = 40 gal/wash <br />Average 7 washes per week <br /> <br />Assume savings of 10 gpcd <br />Average people per home = 2.88 <br /> <br />Average time of shower = 6 <br />minutes <br />Average people per home = 2.88 <br />Old showerhead = 4 gpm <br />New showerhead = 2.5 gpm <br />Rebate of $10 per showerhead <br />Average time of usage = 8.1 <br />minutes <br />Average people per home = 2.88 <br />Old faucet = 3 gpm <br />New faucet = 2.5 gpm <br /> <br />Average flush/person/day x <br />Average people per home x <br />(gal/flush of toilets prior to 1994 <br />gal/flush of toilets post 1994) = <br />gal saved/home/day <br />Savings are multiplied by <br />reduction factor5 <br />Water savings presented are <br />cumulative <br />Average <br />washes/week/household x <br />(gal/wash of average washer - <br />gal/wash of low usage washer) = <br />gal saved/week <br />Water savings presented are <br />cumulative <br />Assumed savings (gpcd) x <br />number of people per household <br />= gal saved/day/household <br />Water savings presented are <br />cumulative <br />Average time of shower x (flow 0 <br />old shower head - flow of new <br />shower head) x average people <br />per home = gal saved/day <br />Water savings presented are <br />cumulative <br />Average time of usage x (flow of <br />old faucet - flow of new faucet) x <br />average people per home = gal <br />saved/day <br />Water savings presented are <br />cumulative <br /> <br />14,129 <br /> <br />2015 Annual <br />Savings <br />(1000 GALNRl <br /> <br />2,471 <br /> <br />90 <br /> <br />Average Annual <br />Savings <br />(1000 GALlYRl <br /> <br />1,087 <br /> <br />Estimated Service <br />Life <br />Years <br /> <br />5-25 <br /> <br />Total Penetration <br />at 2015 <br /> <br />7.0% <br /> <br />Retrofi <br />Rebate Program <br />Low Flow Toilets <br /> <br />6,980 <br /> <br />2,581 <br /> <br />437 <br /> <br />1,306 <br /> <br />12 <br /> <br />4.0% <br /> <br />1.4% <br /> <br />39 <br /> <br />Low Usage Washers <br /> <br />Can not quantify <br /> <br />Can not quantify <br /> <br />Can not quantify <br /> <br />Can not quantify <br /> <br />Not available <br />Assume greater <br />than 10 years <br /> <br />5.0% <br /> <br />0.5% <br /> <br />14 <br /> <br />Hot Water Recirculation <br />System <br /> <br />11,146 <br /> <br />3,981 <br /> <br />1,858 <br /> <br />796 <br /> <br />265 <br /> <br />88 <br /> <br />,238 <br /> <br />442 <br /> <br />15 <br /> <br />0.0% <br /> <br />0.0% <br /> <br />1.0% <br /> <br />.0% <br /> <br />28 <br /> <br />28 <br /> <br />Showerheads <br /> <br />Faucets <br /> <br />Residential Outdoor <br />Rain Sensor <br /> <br />Assume savings of 5 gpcd <br /> <br />Assume savings of 10 gpcd <br />Average people per home = 2.88 <br />Water savings were adjusted to <br />account for the four year service <br />life. Irrigation timers older did not <br />contribute towards additional <br />savings. <br />Irrigation savings application = 9 <br />gal/sf/year. (This is close to 1/2 of <br />the 27 inches the District uses for <br />its budget billing system). <br />Total xeriscaping of residence <br />landscapes = 1 acre/yr <br /> <br />Assumed savings (gpcd) x <br />number of people per household <br />= gal saved/day <br />Water savings presented are <br />cumulative <br />Assumed savings (gpcd) x <br />number of people per household <br />= gal saved/day <br />Water savings presented are <br />cumulative <br /> <br />3,095 <br /> <br />8,616 <br /> <br />295 <br /> <br />826 <br /> <br />147 <br /> <br />399 <br /> <br />238 <br /> <br />663 <br /> <br />4 <br /> <br />4 <br /> <br />5.0% <br /> <br />7.0% <br /> <br />0.5% <br /> <br />0.7% <br /> <br />14 <br /> <br />20 <br /> <br />Irrigation Clock <br /> <br />Savings of irrigation application <br />(gal/sf/year) x area of xeriscape <br />= gal saved/year <br />Water savings presented are <br />cumulative <br /> <br />88,209 <br /> <br />7,642 <br /> <br />,960 <br /> <br />9,801 <br /> <br />10 <br /> <br />n/a <br /> <br />n/a <br /> <br />217,800 square <br />feet <br /> <br />Sod Replacemen <br />Residentiaf <br /> <br />7-3 <br /> <br />CDM <br />