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WATER CONSERVATION PLAN 2008 <br />A summary of water usage for each billing classification including the City's own <br />use is provided in Table 4 below for 2001 to 2006. <br />For 2006 the total metered water demand (or billed authorized consumption) was <br />5,284,209 thousands of gallons, which is equivalent to 16,217 acre -feet. Raw water <br />storage capacity for the City is approximately 31,848 acre -feet. However, metered <br />water usage does not represent the total treated water demand, which was <br />approximately 17,692 acre -feet in 2006, as it does not account for other non - revenue <br />uses. <br />Non - revenue water includes water that is entering the distribution system but not <br />generating revenues for the City. Non - revenue water has three main categories: <br />• Unbilled authorized consumption - unbilled authorized users, such as hydrant <br />flushing and City irrigation. <br />• Apparent losses - unauthorized users, metering inaccuracies, data handling <br />errors. <br />• Real losses - main and service line leakage, overflow leakage. <br />TABLE 4 <br />Metered Water Use (Billed Authorized Consumption) by Customer Classification 2001 -2006 (1,000 gallons <br />Year <br />Residential <br />Multifamily <br />Small <br />Commercial <br />Large <br />Commercial <br />Irrigation <br />City <br />Total <br />2001 <br />2,162, 981 <br />5111265 <br />9801988 <br />3811066 <br />1201112 <br />2791487 <br />4,435, 899 <br />2002 <br />2,172, 075 <br />4797754 <br />9847418 <br />3131912 <br />1551697 <br />2897684 <br />413951540 <br />2003 <br />2,133, 369 <br />4971988 <br />9161529 <br />2831817 <br />2091093 <br />2351450 <br />472761246 <br />2004 <br />210911459 <br />4751709 <br />9431612 <br />2441896 <br />2451071 <br />2241297 <br />472251044 <br />2005 <br />214411160 <br />4961260 <br />9871240 <br />2581232 <br />2711855 <br />2381930 <br />476931677 <br />2006 <br />218621999 <br />5271105 <br />110287067 <br />2501815 <br />3691496 <br />2457727 <br />572841209 <br />Source: City of Longmont Annual Water Reports <br />In order to more accurately characterize water use, following the nomenclature in <br />Figure 2, an attempt was made to quantify both the unbilled authorized water <br />consumptions and the apparent and real water losses from the system. To begin <br />with, the unbilled authorized consumption was developed looking at unbilled <br />metered and unbilled unmetered authorized consumptions. Unbilled metered water <br />consumptions include hydrant flushing and washdown water at the Wade Gaddis <br />Filtration Plant. Unbilled unmetered water consumptions include, but are not <br />limited to, fire fighting, fire training, grading and dust control, inspection and <br />testing, parks and forestry, sanitary sewer jetting, spring flushing, storm sewer <br />jetting, street sweeping, and tank cleaning. For 2006 the City provided estimates of <br />10 <br />