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COMMENTS AND CONCERNS <br />Absent user-supplied data, year 2000 water demand rates (see Table 2) should be used to <br />estimate historical municipal water demands for the 1950 to present SPDSS study period. These <br />demands do not address future conservation efforts planned by various municipalities. Any <br />reduced demands anticipated from conservation efforts can be represented in the Baseline data <br />set for the SPDSS model when analyzing future scenarios. <br />The approach and results presented herein to estimate municipal water user demands and SSI <br />demands are considered appropriate for the SPDSS modeling effort for the 1950 to present <br />period. Actual model locations for these demands may be refined during other SPDSS surface <br />water and ground water modeling efforts. <br />Monthly time series of municipal and SSI water demands and consumptive use estimated have <br />been developed as described herein using TSTooI. The recommended approach to estimate <br />municipal water user demands and consumptive use do not include the following: <br />• Unit demand rates may have reduced over time due to: <br />- Installation of water meters in the mid- to late-1970s and 1980s <br />- Smaller houses and lots being developed and sold over time, <br />- More sprinkler systems being used over time et cetera <br />• Unit demand rates may vary, up or down, based on drought conditions, wet summers, et <br />cetera. <br />• Consumptive use rates may have changed over time as municipalities changed from septic <br />treatment to central sewer treatment. <br />Some of the population, municipal or unincorporated, included in aggregate nodes may use water <br />from designated basins. The supply has not been extensively investigated for this task, and, with <br />the exception of O1_AMP001 & O1_AUP001, the aggregate nodes were not organized by supply <br />water sources. Rather, the aggregate nodes were organized by the location of their demand on the <br />river system. <br />If additional data regarding the above is obtained that information should be incorporated during <br />the SPDSS modeling effort. <br />REFERENCES <br />Black & Veatch et al., South Metro Water Supply Study February 2004. <br />Camp, Dresser & McKee, Colorado Water Conservation Board Statewide Water Supply <br />Initiative Report, November 2004. <br />Case No. 81 CW 142 decree. <br />Case No. 88CW246 decree. <br />Task 66.2 Memorandum.doc Page 24 of 26 <br />