SWSI_Demand_Methodology_11-26-03

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CONI Methodologies for Estimating and Projecting Urban (Municipal & Industrial) and Agricultural Demands and Environmental and Recreational Flow Requirements November 2003 issues and needs. These estimates of future water demand are not being developed at the water provider level, nor are they intended to replace the planning efforts of individual water providers. The originally proposed methodology for estimating urban water demand was based on the assumption that total urban water use data would be available for each county. The data source assumed to contain water use data that could be aggregated for each county was found to contain water use data for a limited number of water providers and not provide complete coverage for all counties. Thus, the methodology for estimating urban water demand has been revised as follows. The recent CWCB Drought and Water Supply Assessment (DWSA) Survey database contains reported annual water use for the year 2000 for about 180 water providers. Service area population in the year 2000 will be obtained for as many of the 180 providers as feasible. Approximately 120 of these providers are municipalities for which the 2000 Census, as modified by the Colorado Department of Local Affairs (DOLA), municipal population may be used as a proxy for the service area population, if service area population cannot be obtained from the providers. The providers for which population can be identified will represent a sample of water use providers throughout the state and should include both large and small municipalities. Given the year 2000 water use reported in the DWSA Survey and corresponding year 2000 municipal population, the per capita urban water use in year 2000 will be calculated for each of these providers. This calculated gallons per capita water use will represent a sample database. 2 S:\TASK 8 & 9 SUPPLY AND DEMAND\SWSI DEMAND METHODOLOGY 11-26-03.DOC