Laserfiche WebLink
WATER CONSERVATION PLAN 2008 <br />The City currently has two large industrial user accounts: a pharmaceutical company and <br />a food processing facility. Since the City has a diverse portfolio of water rights to support <br />additional industrial development, growth is expected in this customer class in the future. <br />Forecasting for future industrial growth is not necessarily linear; however, a linear <br />projection was used, given the lack of other data. To this end, future treated water use for <br />the industrial accounts was based on past usage and growth projections. <br />Small commercial treated water demand growth has been variable in the past. In 2000 and <br />2001 there were observed growths spurts in small commercial water use, but the rate has <br />declined in the past several years. Forecasting small commercial water demand was based <br />on the growth rate as indicated by the estimated building permit square footage increase <br />from 2008 to 2012. Data on non - residential building square footage was obtained from the <br />Planning and Development Services Division. The annual growth rate of small <br />commercial square footage between 2008 and 2012 was estimated as 1.7 percent. Even <br />though this percentage is based on building square footage projections for five years, it <br />was applied to water use through 2017 for purposes of this evaluation. <br />The irrigation water use category was established in 2001 and represents taps specifically <br />dedicated to irrigation such as HOA areas, neighborhood common areas, and some small <br />commercial establishments with large irrigable acreage that utilize sub - metering (i.e., <br />these businesses have a separate water tap for irrigation water) . Based on the observed <br />growth of irrigation watering use since 2001 (see Appendix B), annual treated water <br />demand for this customer category was assumed to be linear based on historical use <br />patterns, with an average annual increase of 1.7 percent. <br />City treated water demand was assumed to be consistent with historical usage from the <br />past ten years. Increasing water efficiency as well as offsets from converting treated water <br />irrigation to raw water irrigation resulted in assuming no growth for City treated water <br />demand. <br />Additional authorized uses, including unbilled metered and unmetered demand, were <br />assumed to increase slightly at a growth rate of 0.25 percent based on the historical value <br />estimated from 2006. <br />Figures detailing the predicted water use for each of these water use customer categories <br />are presented in Appendix B. <br />With the forecasting methodology established for authorized use demands, the <br />unauthorized uses need to be accounted for. Previously the unauthorized uses (water <br />losses) were estimated for 2007 and summarized in Table 7. The total water loss <br />percentage was estimated as 8.1 percent for 2006. Since this represents the most recent <br />estimate it was assumed for this evaluation that losses due to unauthorized uses remained <br />at 8.1 percent through 2017. Therefore the evaluation of measures and programs does not <br />account for increased losses that may occur due to aging infrastructure or decreased <br />losses due to a more aggressive leak detection program. <br />26 <br />