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Show 292 and surveys must include data relating to the possible econom- ical development and utilization of power and other properly related uses.200 Furthermore, we have already noted the up- surge of federal interest in flood control and the national devel- opmental program growing since 1936. So far as federal power development is concerned, it is therefore important to note that in authorizing flood-control projects since 1938, Congress has provided for the installation of penstocks and other facilities, just as in the 1945 and 1946 River and Harbor Acts.201 In legislating for reclamation projects in the West, Congress has made provision for development of power in addition to the control of water for other purposes and uses. The develop- ment of power at irrigation projects was expressly recognized in a 1906 supplement.202 Similarly, the 1939 Reclamation Project Act contemplates that surveys and' studies of pro- spective reclamation projects will take into account the possible development of power and other project uses, including munici- pal water supply, flood control, and navigation.203 Such is the character of those surveys and studies as to require con- sideration of both existing and potential developments on the stream from which any proposed project will draw its supply. This in turn necessitates basin-wide surveys and basin-wide planning. In addition, it has already been indicated that the Federal Power Act authorizes the Federal Power Commission to carry on continuing surveys of waterpower potentialities in river basins throughout the United States.204 The scope of that authority measures the importance of that function to federal as well as nonfederal development. For such authority com- prehends investigation of the possibilities of utilizing water re- sources, the relation of waterpower development to other electric-power generation and transmission, the electric-power requirements of economic regions, power-load variations and 200 See supra, pp. 134-135. 201 See supra, p. 141. 208 Act of April 16, 1906, § 5, 34 Stat. 116, 117, as amended, 43 U. S. C. 522. m Act of August 4,1939, § 9 (a), 53 Stat. 1187,1193, 43 U. S. 0. 485h (a). 204 See supra, pp. 274-275, |