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00: 3'34 . . YAMPA STUDY DEMANDS August 15, 1994 Page 4 Other Other included demands not reflected in the itemized sectors such as snow-making. Reservoir Evaporation Reservoir evaporation was determined as remaining constant except for the specific evaporation associated with the various new reservoir options considered. Basin Export Minor exports from the Yampa River basin currently go from Yamcolo Reservoir to the Colorado River drainage. For the purposes of the Yampa study no new basin exports were considered as all the historic basin export proposals have died. Past proposals to use hydraulic pipelines to transport coal would function as basin exports. These were not considered. The W.R. Grace proposal of putting coal in plastic bags and propellling them to customers east of the divide projected water consumption of 12,000 AF. HYDROLOGrC MODELING Water supplies and demands were representated in the hydrologic and water right computer model of the Yampa River basin generated by Hydrosphere. Larger water demands were represented individually and smaller water demands were often "aggregated" in the model. The model utilized historic gage hydrology as a baseline. Existing and historic water demands were considered to be "embeded" in the gage record. The gage records were adjusted for the existing demands which occurred for only part of the 1930 to 1982 study period. Demand Location In the hydrologic model demands were located in "nodes" as close as possible to where they do or are likely to occur. The 8,000 AF coal gasification plant was located near Craig, upstream of the Williams Fork, in the "worst" place hydrologically, possible. Demand Priority Demands were assigned priorities in the hydrologic model based on the current access of such demands to water right priorities and storage water. Water demands with undefined priorities were treated as junior users in aggregate.