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2 WATER DEMAND AND HISTORICAL DEMAND MANAGEMENT <br />2.2.2 Estimated Savings from Past Water Conservation <br />Efficient use of water has been a consistent message from the City's water utility for several years. Over the <br />years, many factors contribute to decreasing per capita water demand, including City water conservation <br />programs, improved metering, continued learned behavior from drought years, and public education. The <br />estimate of savings from water conservation for the City of Louisville was based on the average per capita <br />treated water production from 1999 to 2001 applied to the current 2013 population, and then comparing <br />this result to the actual value from the 2011 -to -2013 average. As stated previously, the 2010 U.S. Census <br />adjusted the population to a lower value. Because an overestimate of population will result in <br />underestimating per capita water use, the population was reverse forecasted from 2010 back to 1999 in <br />order to estimate savings already achieved. Per capita values of treated water production were used instead <br />of metered data because customers were not fully metered in 1999. <br />Based on a gradual increase of savings over time, the total water saved since 1999 is estimated to be <br />326 MG (1,001 acre - feet). This estimate was calculated as follows: The average per capita treated water <br />production from 1999 to 2001 was estimated at 209 gpcd. When applied to the 2013 population of 18,584, <br />this is an annual treated water production of 1,418 MG. The actual average from 2011 to 2013 was <br />1,092 MG. The actual treated water produced was approximately 326 MG (1,001 acre -feet) less than the <br />estimated production based on past per capita values. <br />2.2.3 Reuse Water <br />The City's wastewater treatment plant (WWTP) has the capability to treat a portion of the water to be <br />reused for irrigation. The reuse plant has a maximum treatment capacity of 2 mgd, but the actual amount of <br />water available for reuse is limited by influent flow to the WWTP and water rights operations. Current <br />average daily flow rates to the WWTP are 1.8 mgd. Reuse water is primarily used for irrigation at Coal Creek <br />Golf Course, Community Park, Sports Complex, Miner's Field, and the WWTP. The average monthly total <br />reuse water produced and the average production per day is summarized in Table 9 based on available <br />historical data beginning in 1994. <br />TABLE 9 <br />Summary of Reuse Water Production <br />Month <br />Average Daily Reuse Water Usage'. Average Total Reuse Water Usage <br />(mgd) (MG) <br />January 0.021 <br />February 0.0.032 <br />March 0.055 <br />April <br />May <br />0.67 <br />0.98 <br />1.71 <br />0.134 4.16 <br />0.386 11.96 <br />June <br />0.589 18.27 <br />July <br />0.715 22.15 <br />August <br />0.616 19.10 <br />September 0.421 13.05 <br />October 0.164 5.08 <br />November 0.075 2.33 <br />December <br />0.020 0.63 <br />Notes: <br />1 Usage based on a 10 -year average for the Coal Creek Golf Course, a 5 -year average for the WWTP and ball fields, and 50 acre - <br />feet of demand for Community Park distributed across the irrigation months. <br />MG = million gallons <br />mgd = million gallons per day <br />WBG071714052946BS0 2 -9 <br />