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<br />(Yj <br />C) <br />If) <br />.-! <br /> <br />CHAPTER II <br /> <br />BASES FOR ANALYSES <br /> <br />Water Supply <br /> <br />Operation studies <br /> <br />Since the potential service areas in the Upper Gunnison Basin are <br />located on different streams and are widely scattered, potential develop- <br />ments were separately analyzed. Two plans were made for an Ohio Creek <br />Unit--one discussed in Chapter III for a single-purpose municipal and <br />domestic water development for the city of Gunnison and an alternative <br />plan discussed in Chapter V to provide municipal and domestic water ~or <br />Gunnison as well as water ~or irrigation. Other units considered were the <br />East River Unit discussed in Chapter IV and the Tomichi Creek and Coche- <br />topa Creek Units discussed in Chapter V. <br /> <br />An 18-year period ~rom 1952-69 was selected as the base period ~or <br />water operation studies. The period includes several dry as well as high <br />runo~~ years. The overall runo~~ ~or this study period is about 93 per- <br />cent o~ the long-term recorded stream runo~~ ~rom 1937 to 1969. <br /> <br />Storage in the existing Taylor Park Reservoir on Taylor River is con- <br />sidered as a source o~ water ~or the alternative Ohio Creek Unit. In the <br />early stages of the imrestigations consideration was given to including re- <br />regulation o~ the reservoir in development plans to increase recreational <br />o:p:portunities and stabilize ~lows in Taylor River ~or fish. It was deter- <br />mined, however, that reregulation o~ the reservoir ~or recreation and ~ish- <br />ing could be accoll!Plished independently o~ any further development in the <br />Upper Gunnison Basin and it was not included in any of the development <br />plans. <br /> <br />Plans ~or irrigation developments were based on continuation o~ irri- <br />gation by wild flooding which is generally practiced in the basin. The <br />~looding o~ the lands begins in late May or June and the water is generally <br />not removed until harvest time late in July. Water, when it is available, <br />is again a:p:plied to the lands ~ollowing the harvest. Surplus water runs <br />o~~ the ~ields into ditches or back into the stream channels where it is <br />rediverted and used several times be~ore leaving the area. With this type <br />o~ irrigation, efficiencies o~ about 30 percent are common. <br /> <br />.1 <br /> <br />10 <br />