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WATER CONSERVATION PLAN 2008 <br />the total annual volume of these unbilled authorized water consumptions as <br />presented in Table 5. <br />TABLE 5 <br />Unbilled Authorized Water Consumption Estimate for 2007 (Treated Water Onl <br />Unbilled Authorized Estimated Notes <br />Consumption Volume (MG) <br />Category <br />Unbilled Metered 364 Bulk water, including washdown water at <br />Wade Gaddis' <br />Unbilled Unmetered 42 Hydrant flushing, fire fighting, fire training, <br />grading and dust control, inspection and <br />testing, parks and forestry, sanitary sewer <br />jetting, spring flushing, storm sewer jetting, <br />street sweeping, and tank cleaning <br />Total 406 Non - revenue categories not accounted for <br />in this estimate include unknown data <br />handling errors, meter inaccuracies, and <br />leakage. <br />1 Plant water at the Nelson- Flanders WTP is currently not metered and not <br />accounted for in non - revenue water. <br />For 2007, the total estimated unbilled authorized water consumption was 406 <br />million gallons (MG), which is about 7.7 percent of the total metered water demand <br />for the year and approximately 1.1 MGD. As indicated in Table 5 water used at the <br />Nelson - Flanders WTP for washdown, chemical feed, and other miscellaneous uses is <br />not included. <br />Any potable water not accounted for by billed authorized consumption (metered <br />usage), shown in Table 4, and unbilled authorized consumption shown in Table 5, is <br />considered water loss, either real or apparent. Essentially water loss represents the <br />difference between total treated water production entering the distribution system <br />and the authorized and/or measured consumption. <br />Total treated water production represents the amount of water leaving the drinking <br />water treatment plants. Residential per capita water use represents the total metered <br />usage from residential and multifamily accounts divided by the total service <br />population. Also reported in the table is gross per capita water use, which is <br />calculated as the total treated water production divided by the total service <br />population. Treated water production, residential per capita, and gross per capita <br />water use from 2000 to 2006 is provided in Table 6 below. <br />