Longmont WC Plan 2008 - Laserfiche WebLink

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WATER CONSERVATION PLAN 2008 Combining the results from these various customer classes and water users allowed for the prediction of future treated annual water demand, as summarized in Table 13. Raw water irrigation, which is currently used by the City to maintain various parks, school grounds, arterials, golf courses and other City facilities, is not consistently metered. Therefore, there is not an estimate of current raw water use, let alone future raw water use. The best current estimate of raw water use on the 27 parks, two golf courses, 13 schools, and other City facilities, which cover about 580 irrigated acres is about 1,450 acre- feet per year, assuming about 30 inches of water is applied each year. Since an increase in raw water use would be offset by a reduction of treated water use, future forecasts do not included increases in future raw water irrigation, per se. Additional raw water irrigation that will be implemented by the City in the future will be offset by a reduction in treated water demand with a net effect of reducing unaccounted for water and water use at the treatment plant (which totals about 13.7% of total treated water demand). As previously indicated, forecasting under current water conservation practices does not include an increase in the amount of raw water being used for irrigation through 2017. This is especially appropriate for Longmont since many raw water irrigation supplies are from different sources than the raw water supply sources for the treated water system. Significant effort has been made to realistically reflect forecasted treated water demands, however there are some critical assumptions that have been made and are summarized below: • No increase in system losses was attributed to aging infrastructure, • New water use categories were not considered, • Potential impacts from climate change were not quantified or incorporated. 27