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812 <br />VI. Summation: <br />Calculation of the Total Technical Potential for reducing municipal per capita water <br />use is determined by adding the individual technical potential amounts in items I through V <br />above. The following table is a summary of these calculations for the City of Paris water <br />system: <br />Conservation Measure <br />Calculation Procedure <br />Results <br />Reducing unaccounted -for <br />(Dry-year demand) X <br />0 to 1.87 gpcd <br />uses <br />(Unacc. -for percentage if <br />over 15 %, minus 15% <br />Reducing indoor water use <br />20.5 gpcd (Most likely) to <br />20.5 to 21.7 gpcd <br />due to water- efficient <br />21.7 gpcd (Advanced) as <br />plumbing fixtures <br />determined by the TNRCC <br />Reducing seasonal water <br />Seasonal use (Avg. use X <br />2.64 to 7.55 gpcd <br />use <br />20% ) X 7% and 20% <br />Reducing water use through <br />Average use X 2% and 5% <br />3.77 to 9.44 gpcd <br />public education programs <br />Reducing dry-year irrigation <br />Dry-year irrigation use <br />2.04 to 3.88 gpcd <br />use <br />(Dry-year demand - Avg. <br />use) X 10.5% and 20% <br />Total Technical Savings <br />28.95 to 44.44 gpcd <br />Potential <br />To determine the long -term planning goal, these totals are subtracted from the <br />year water demand (208.1 gpcd for Paris). <br />Long -term planning goal = (Dry-year demand) minus (Total Technical Potential) <br />= 208.1 gpcd - 28.95 gpcd = 179.15 gpcd ( "Most Likely" conservation scenario) <br />= 208.1 gpcd - 44.44 gpcd = 163.66 gpcd ( "Advanced" conservation scenario) <br />nning goal for municipal water use = 179.15 to 163.66 <br />These goals are based on a potential reduction in total municipal gallons per capita <br />per day demand by the year 2050. Some of these conservation measures, such as <br />retrofitting of water - conserving plumbing fixtures, will not be realized in the early years of <br />the goal but will result in increasing benefit as we approach the year 2050 when more <br />older homes are re- plumbed and future new homes constructed. A tentative schedule to <br />achieve 100% of the goal by the year 2050 would be: 10% by 2010, 25% by 2020, 50% <br />by 2030, 75% by 2040 and 100% by 2050. <br />Prepared by: City of Paris Environmental Services Division, December, 1999 <br />9 <br />