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<br />Section 7 <br />Evaluation and Selection of Conservation Measures and Programs <br /> <br />Assumptions <br />Average water usage per home = <br />161 kgal/home <br />Average outdoor water usage = <br />55% <br />Percentage outdoor water savings <br />= 30% <br /> <br />Calculation of Water Savings <br />Per Unit (Water Savings <br />presented in this table are <br />cumulative) <br />Average water usage per home x <br />percentage outdoor use x <br />percentage outdoor water <br />savings = gal saved/year <br />Water savings presented are <br />cumulative <br /> <br />Total Savings of <br />Program During <br />Planning Period <br />000 GAL <br />1,198 <br /> <br />Annual Savings in <br />2005 or at onset of <br />program4 <br />(1000 Qt.LlYRl <br />27 <br /> <br />Savings <br /> <br />Table 7-2 Estimated Wate <br /> <br />2015 Annual <br />Savings <br />000 GAlNRl <br />240 <br /> <br />Average Annual <br />Savings <br />(1000 GALlYRl <br />133 <br /> <br />Estimated Service <br />Life <br />Years <br />10 <br /> <br />Total Penetration <br />at 2015 <br />7.0% <br /> <br />Annual <br />Penetration <br />0.7% <br /> <br />Target Numbe <br />of Units per <br />y~ <br />20 <br /> <br />Retrofi <br />ET Controller <br /> <br />2.4% of total annual potable water <br />demand is residential water use at <br />Tier 4 level <br />10% water savings from audi <br /> <br />% water savings = 10% <br />Average water usage per home = <br />152 Kgal/yr <br /> <br />Total potable annual water <br />demand x 2.4% x 10% audi <br />savings = gal saved/year <br />Water savings presented are <br />cumulative <br />Average water usage per home x <br />percentage water savings = gal <br />saved/year <br />Water savings presented are <br />cumulative <br />n/a <br /> <br />3,922 <br /> <br />1,566 <br /> <br />1 ,484 <br /> <br />1,547 <br /> <br />Audits provided <br />every year <br /> <br />n/a <br /> <br />2.4% of tota <br />annual wate <br />production <br /> <br />Residential Indoor and Outdoor <br />Audits for Residential AITCustomers <br />Homes at Tier 43 exceeding Tier 4 <br /> <br />24,966 <br /> <br />4,027 <br /> <br />805 <br /> <br />2,774 <br /> <br />4 <br /> <br />7.0% <br /> <br />1.9% <br /> <br />53 <br /> <br />Indoor and Outdoor <br />Audits for Homes Bui <br />prior to 19941 <br /> <br />n/a <br /> <br />Can not quantify <br /> <br />Can not quantify <br /> <br />Can not quantify <br /> <br />Can not quantify <br /> <br />5.0% <br /> <br />0.5% <br /> <br />14 <br /> <br />Rebate <br /> <br />20% <br /> <br />n/a <br /> <br />n/a <br /> <br />Can not quantify <br /> <br />Can not quantify <br /> <br />Can not quantify <br /> <br />Can not quantify <br /> <br />Audit provided <br />everE.Years <br />10 <br /> <br />n/a <br />n/a <br /> <br />n/a <br />n/a <br /> <br />n/a <br />n/a <br /> <br />The Ridge Golf Course <br />Water Audit for the Ridge <br />Golf Course <br />Reuse on Ridge Gol <br />Course <br /> <br />District is planning on using 240 <br />AFY of treated effluent to irrigate <br />the Ridge Golf Course <br /> <br />5% water savings from audit <br />1/3 of the HOA irrigated lands IS <br />audited every year and water <br />savings last at least 3 years unti <br />next audit <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 /> <br />n/a <br /> <br />15% x HOA water usage <br />Water savings presented are <br />cumulative <br /> <br />782,042 <br /> <br />6,006 <br /> <br />78,204 <br /> <br />2,001 <br /> <br />78,204 <br /> <br />667 <br /> <br />78,204 <br /> <br />1,778 <br /> <br />10 <br /> <br />00.0% <br /> <br />33.0% <br /> <br />11 HOAs (Total <br />of 33 HOAs) <br /> <br />HOA Irrigation <br />Audits for HOAs <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 />78,947 <br /> <br />5,789 <br /> <br />1,754 <br /> <br />8,772 <br /> <br />10 <br /> <br />25.0% <br /> <br />2.5% <br /> <br />94,931 square <br />feet <br /> <br />Sod Replacemen <br />HOA2 <br /> <br />Conservation Rate Structure <br />Increasing Block Rate I <br />Structure I <br /> <br />I % decrease in potable demands I Assume 3% decrease in total <br />x end user demands potable water use (excluding Ridge <br />Golf Course) <br /> <br />200,263 <br /> <br />8,700 <br /> <br />5,709 <br /> <br />8,463 <br /> <br />Implemented whole <br />planning period <br /> <br />00.0% <br /> <br />00.0% <br /> <br />% savings of all potable usage <br /> <br />% x annual potable usage <br /> <br />55,388 <br /> <br />6,233 <br /> <br />5,901 <br /> <br />6,154 <br /> <br />System will be <br />assessed every <br />3 ears <br /> <br />10 <br /> <br />Entire system <br /> <br />1/3 of system <br />each year <br /> <br />7-4 <br /> <br />% savings of all potable usage <br /> <br />I Open space and parks/drip <br />irrigation uses 60% and 40%, <br />respectively <br />Metered data shows a savings of <br /> <br />% x annual potable water usage 1 <br /> <br />I Metered savings from 2003 to <br />2005 x 40% = gal saved <br /> <br />55,388 <br /> <br />31,086 <br /> <br />6,233 <br /> <br />3,109 <br /> <br />5,901 <br /> <br />3,109 <br /> <br />6,154 <br /> <br />3,109 <br /> <br />10 <br /> <br />n/a <br /> <br />n/a <br /> <br />n/a <br /> <br />n/a <br /> <br />I I <br /> <br />Public Education Program <br />Existing and new n/a T <br />measures I <br />District Irrigation Water Conservation Efforts <br />Irrigation Efficiency for n/a I <br />Parks and Drip Irrigation I <br /> <br />n/a <br /> <br />leak Detection <br />Sonic Leak Detection <br />Program <br /> <br />n/a <br /> <br />CDM <br />