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IJD1256 . CHAPTER IV IMPROVEMENT AND EXTIlNSION Changes in irrigation water requirements would occur in the future with changes in cropping patterns, increases in water appli- cation efficiencies and changes in the project irrigated acreage. For purposes of this report, however, the water requirements under the improvement plan were assumed to rl!lllBin tbe s8llle as computed for evaluation of the supplies available with the present system. Month-by~onth comparison of the water supplies available under the improvement plan indicate that irrigation water shortages would be reduced to an average of 6,200 acre-feet annually, or 1.8 percent of the annual water requirement. Water deliveries to project farms within the requirements of the lands would be increased under the improvement plan by an average of 19,600 acre-feet annually. Municipal and Industrial Water Supply . With development of the Dallas Creek Project, nearly all of the foreseeable municipal, industrial, and domestic water needs of the Uncompahgre River valley will be supplied by that project. Some exchanges of water between the Dallas Creek and UncOlllpahgre Projects may be necessary, however, to supply some of the pipeline systema now under construction or to be constructed by the Tri-County Water Conservancy District. With such exchanges, water would be released at requi~ed points from Uncompahgre Project facilities to the pipe- line systema with replacement of the water from Ridgway Reservoir of the Dallas Creek Project. Except for these possible exchanges, provision of additional municipal, industrial or domestic water from the Uncompahgre Project to the Uncompahgre valley area is not contemplated. No studies have been made concerning the timing or seasonal pattern of needs for additional municipal, industrial, and domestic water needs for the Grand Valley area in and around Grand Junction. With the available water supply and capacity planned for Dominguez Lake, no problems would be anticipated in supplying the estimated 20,000 acre-foot annual requirement. Water Quality Control The present quality of flows of the Gunnison River is prinCip- ally a product of natural sources and in-basin uses. Irrigated valleys of the basin have been reported to be the primary sources of soluble salts in river flows, although natural runoff through marine shale soils and wastes from mining operations and residential areas also contribute dissolved solids. There is presently little water importation to or exportation from the basin. No plana are known . 59