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1.Analysis of the maximum, minimum and average temperatures, and precipitation <br />records for the period 1970-90. <br />2.Review of a map provided by Colorado State University's IDS group. The map <br />shows the locations of the weather stations and the irrigated areas in the upper stem <br />of the Colorado River. <br />3.Review of the USGS topographic maps. <br />It is recommended that if the elevation of the irrigated area is different than the elevation of the <br />weather station, the temperatures used to calculate consumptive use be adjusted using appropriate <br />adiabatic lapse rates. <br />3.0RESULTS AND CONCLUSIONS <br />The recommended changes for each hydrologic unit and county are summarized in Table 4 and <br />discussed in the following text. In hydrologic units and counties where more than one weather <br />station is recommended, the weighting factor for each station was determined by the CSU IDS group <br />using GIS technology. <br />Hydrologic Unit 14010001, Eagle County <br />For this unit, the CULR used the Eagle station. In this analysis four stations, Eagle, Yampa, <br />Kremmling and Green Mountain, were considered for this unit. Temperature differences between <br />Eagle, Yampa and Kremmling are about what one would expect given the elevation differences <br />between the stations. Green Mountain Dam is not a good temperature station as it is located in a <br />narrow river canyon at the base of the dam. Minimum temperatures at Green Mountain are <br />abnormally high. Average annual precipitation at the four stations is: Yampa (15.33 inches), Green <br />Mountain Dam (13.56 inches), Eagle (10.57 inches) and Kremmling (9.23 inches). Based upon the <br />location of the irrigated area with respect to the weather stations and topography, the Yampa station <br />is recommended for this hydrologic unit. <br />Hydrologic Unit 14010001, Grand County <br />For this unit, the CULR used the Green Mountain Dam station. In this analysis, four weather stations <br />were analyzed, Green Mountain Dam, Williams Fork Dam, Kremmling and Grand Lake 6 SSW. For <br />the reason stated above, Green Mountain Dam is not recommended. The average annual <br />precipitation from 1981 through 1990 at Kremmling, Williams Fork Dam and Grand Lake 6 SWW <br />was approximately 9.3, 14.0 and 14.5 inches, respectively. Based upon a review of topography and <br />analysis of precipitation, the Grand Lake 6 SSW weather station is recommended for estimating <br />consumptive use on irrigated lands upstream of the confluence of the Colorado River and Rock <br />Creek including lands irrigated with water diverted from the Williams Fork. The Kremmling <br />weather station is recommended for estimating consumptive use on irrigated land downstream of the <br />confluence of the Colorado River and Rock Creek. <br />Hydrologic Unit 14010002, Grand County <br />2 <br />12.3.96 12.09-14 - Walter <br />