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• Commercial water use is predicted to increase by about 5.5 % per year; <br />whereas irrigation water use (i.e., water used by commercial entities with a <br />separate irrigation tap, HOAs including pocket parks, etc.) was predicted to <br />increase by about 10 % per year. These future water uses are based on the <br />observation that from 2002 to 2006 commercial water use increased by more <br />than 60 % and irrigation water use more than doubled. <br />• Municipal water use is also expected to increase in the future, driven <br />primarily by new parks being created in association with new housing <br />developments. Municipal water use is predicted to increase by 10 % per year, <br />based on increases observed over the past two years. <br />Beneficial impacts of measures and programs identified through this planning effort <br />that are expected to reduce treated water demand have not been included in the <br />forecasting. In addition, the 2007 rebate program has not been included in this <br />forecasting eff ort since no data on overall program reach is currently available. <br />Using these assumptions, total treated water demand was f orecasted through 2017, <br />as shown in Table 4 as a sum of estimated future water use by each customer type. <br />Non-potable water demand is also expected to increase over the planning horizon <br />based on the City's commitment to reduce the use of treated water for outdoor <br />irrigation, and the availability of non-potable water from Fulton Ditch shares <br />currently owned by the City. The following assumptions were used to estimate <br />future non-potable water use: <br />• Non-potable water use (categorized as "other non-potable" uses in Table 4) <br />was estimated to increase f or non-municipal f acilities, including schools at a <br />rate of about 20 % per year, nearly doubling about every f our years, beginning <br />in 2011, which is consistent with the observed growth in non-potable water <br />use from 2004 to 2006. <br />• Current non-potable water use on municipal facilities was expected to remain <br />at levels consistent with past ditch water use. The projection of future non- <br />potable water use on municipal facilities does not include non-potable <br />conversion projects that are currently being planned by the City. The impact <br />and benefit of future conversion projects will be included in the evaluations <br />of water conservation measures and programs presented in Section 7. <br />Table 4 also summarizes non-potable water use through 2017 based on these <br />assumptions. <br />Daily Peak Treated Water Demand <br />Daily peak treated water demand has been measured and consistently recorded by <br />the City since 2002. This information was used to develop an estimate of future <br />daily treated water demand as f ollows: <br />City of Brighton Water Conservation Plan 10 <br />