RGDSS_Task8-8_HistoricMonthlyModel_BaseflowCheckandSimulationRuns

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were increased by 15 percent based on service area population information provided by the City of Alamosa. Municipalities provide water for a variety of purposes including residential, commercial, recreational (park or open area irrigation) and some types of industrial uses. Other industrial uses supply their own water from independent sources. In the San Luis Valley, these industrial uses include fish hatcheries (Colorado Division of Wildlife), the Rakhra Mushroom Farm, the Colorado Alligator Farm; and mining operations (Summitville, Battle Mountain and Manville- Perlite). Much of the water used for these industrial purposes is supplied from deep groundwater wells typically located in the confined aquifer. The amount of water used for industrial purposes from groundwater wells is not known although Water Division 3 estimates the amount to be minimal in comparison to municipal and agricultural uses: water is often used only for dust suppression or in small flow-through systems (e.g. for fish hatcheries). Table 1 Populations of Selected Cities and Towns in the San Luis Valley Municipality 1997 Adjusted Estimated Water Percent Population Population~a~ Use (af/yr) of Total 1 Alamosa 8,775 10,091 2,580 36.7% 2 Antonito 895 1,029 322 3.7% 3 Blanca 297 342 117 1.2% 4 Center 2,366 2,721 973 9.9% 5 Creede 413 475 163 1.7% 6 Crestone 68 78 27 0.3% 7 Del Norte 1,809 2,080 853 7.6% 8 Hooper 124 143 49 0.5% 9 La Jara 748 860 296 3.1 10 Manassa 1,000 1,150 342 4.2% 11 Monte Vista 4,721 5,429 2,064 19.7% 12 Romeo 372 428 147 1.6% 13 Saguache 676 777 267 2.8% 14 San Luis 879 1,011 348 3.7% 15 Sanford 763 877 302 3.2% Total 23,906 27,492 8,851 100.0% Source: Colorado Department of Local Affairs (Colorado Demography Section) http://www. dlg. oem2. state. co.us/demo g/munimast. htm Note: (a) Population adjusted upward by 15% to reflect additional residents within service area but not within city corporate limits based on data for Alamosa. (b) Estimates based on average of 300 gpd per capita (average of actual data from Alamosa, Antonito, Center, Del Norte, Manassa and Monte Vista). (c) Represented explicitly in the surface water model. (d) Represented within an aggregated group in the surface water model. Eight municipal demands are represented in the Rio Grande Surface Water Model. Included are explicit representation of Del Norte, Monte Vista, and Alamosa, and five aggregated municipal structures that represent the demands of several smaller towns. The demands used in model input files were created by estimating populations back in time to 1950, then applying the same per- capita water use rates used to estimate 1997 water use. Because water uses typically vary over the course of the year, the estimated annual water use amounts were distributed according to the following monthly pattern: C:Acdss\Task8-8.doc Phase lc Model September 27, 2000 -Page 4 of 17