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2 WATER DEMAND AND HISTORICAL DEMAND MANAGEMENT <br />2.2 Historical Water Usage <br />The summary of historical potable water use is summarized into authorized water use and water losses, as <br />discussed in the following subsections. <br />2.2.1 Authorized Water Use <br />Authorized uses of water from the City of Louisville include metered water to customers, bulk water <br />permits, and unmetered water for authorized purposes (flushing, firefighting, street washing, etc.). Water <br />used for bulk permits is shown as an authorized use. There are no estimates of unmetered water for <br />authorized purposes, so this water is not accounted for in the authorized use category in this evaluation. In <br />the future, this relatively small number should be quantified so it can be accounted for as authorized <br />unbilled usage. Annual water treatment plant production and authorized water usage for the City's water <br />customers from 1999 to 2013 is summarized in Figure 2. <br />Demand data prior to 2011 should be interpreted with caution for two main reasons: (1) a portion of the <br />water meters in the system were misclassified in the billing system, and (2) upgrades to the billing system <br />that improved water accounting were complete in 2010. <br />FIGURE 2 <br />Annual Treated Water Production and Authorized (Metered) Consumption, 1999 to 2013 <br />1,700 <br />1,600 <br />1,500 <br />1,400 <br />1,300 <br />1,200 <br />1,100 <br />01,000 <br />T3 900 <br />15 800 <br />0 700 <br />2 <br />600 <br />500 <br />400 <br />300 <br />200 <br />100 <br />0 <br />Annual Treated Water Production and Metered Usage <br />•`. <br />' <br />• • <br />• 4 •♦ <br />• • 4 <br />• <br />• • <br />.. • <br />4 • • • <br />• • • • • • • �, <br />• <br />LLLiLLL 1 L1111. <br />City <br />IMF <br />O1 0 C-I N m V L!1 LO 00 01 0 r-1 N m <br />Ql 0 0 0 0 0 0 0 0 0 0 <br />rn 0 0 0 0 0 0 0 0 0 0 0 0 0 0 <br />c-I N N N N N N N N N N N N N N <br />■REST+ RESO <br />■Construction Water <br />�COMI +COMO <br />—Total Metered <br />IRRI <br />—WTP Production <br />Water conservation programs and resources have been available from the City for several years. However, <br />in 2002 there was a noticeable decrease in metered water consumption due to a severe drought that year. <br />Since that time, citywide consumption has remained relatively stable, even as the population has increased. <br />A numerical summary of the last 5 years of authorized water use and water treatment plant production is <br />provided in Table 5. Annual treated water production from 2009 to 2013 ranged from 1,170.81 to <br />1,381.41 million gallons (MG), or 3,593 to 4,239 acre -feet. <br />2 -4 WBG071714052946BSO <br />