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Colorado River problem
Is Part Of,8
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THE COLORADO RIVER PROBLEM 307 adopted and that supervision be exercised to require future developments to conform thereto. Such supervision can be exercised under existing laws by co-operation between the Federal Government and the seven interested States. Although many additional data on stream flow, location, and character of irrigable lands, dam sites, etc., are needed before details of the ultimate development can be determined, sufficient information is available to determine the general scheme in so far as that is necessary for the consideration of projects now advocated. Scheme of Development The essential features of a comprehensive plan of development for the Colorado are determined by topographic conditions. The Upper Basin, which lies above the junction of the main river with the Green River in Utah, has possibilities of development for both irrigation and power; the total area that can be irrigated probably does not exceed 4,500,000 acres, of which about one- third is now irrigated. This area is from 4,000 to 8,000 ft. above sea level and use of water for irrigation will always be limited by climatic conditions. The depletion of water supply by irrigation in this area will probably never exceed 4,500,000 acre-ft. To this should be added diversions out of the Basin which may reach 500,000 acre-ft. In the Upper Basin there are many possibilities for power development, the most promising of which are on the Green between Green River, Wyo., and the junction of the Green with the Colorado. Interference between these power developments and irrigation should be given careful consideration before the developments are undertaken. Such consideration is assured by the fact that practically all such projects involve the use of public lands and thereby come under the jurisdiction of the Federal Power Commission. The Middle or Canyon Section extends from the junction of the Green to a short distance below Needles, Calif. Irrigation in this section will never be important, being limited to a few inter-canyon valleys of doubtful feasibility. The importance of this section is due to the 4,000,000 h.p. it can produce. If water is reserved for up-stream irrigation, and re-regulation is provided for irrigation below, there will be no interference with irrigation by power in this section. Below Needles, including Mexico, there are more lands that can eventually he irrigated than there will be water to serve. Power possibilities in this section are small and will be incidental to irrigation development. The Gila River enters the Colorado just above Yuma, Ariz. The development of its \val;er resources has no bearing on the plan for the Colorado, except in the matter of flood protection of the delta region. Permanent settlement of the Colorado Basin will be largely dependent on irrigation. It is probable that in the immediate future power will have a greater value than irrigation, but as power can be obtained from other sources than the river, it should not be allowed to curtail the ultimate irrigation development. Although it is impossible to predict the rate at which either irrigation or power will develop, it is certain that there are more than enough irrigable lands

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