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Show 517 the authorization and construction of navigation works to those in which a substantial benefit to navigation will be realized therefrom and which can be operated consist- ently with appropriate and economic use of the waters of such rivers by other users. Flood-Control Projects.-In its 1936 declaration of flood- control policy, Congress specified that: ^ the Federal Government should improve or participate in the improvement of navigable waters or their tribu- taries, including the watersheds thereof, for flood-con- trol purposes if the benefits to whomsoever they may accrue are in excess of the estimated costs, and if the lives and social security of people are otherwise adversely affected. This policy, of course, applies not only to Army Engineer flood- control projects, but also to flood-control activities of the Department of Agriculture.128 In 1917, Congress required that the provisions of existing law relating to examinations and surveys for navigation shall "apply, so far as applicable," in the case of flood-control improvements.129 In addition, it then specified that all flood-control examinations and surveys must include a comprehensive study of the watershed, each report to include data regarding the extent and character of the area to be affected, the probable effect upon any navigable water, the possible economical development and utilization of water power, and other properly related uses.130 Reports by the Board of Engineers for Rivers and Harbors must state its opinion as to what federal interest, if any, is involved; what share of the expense, if any, should be borne by the United States; and the advisability of adopting the project.131 Irrigation Projects.-A standard totally different from the 127 Act of June 22, 1936, § 1, 49 Stat. 1570, 33 U. S. C. 701a. For the full text of the provision, see supra, p. 131. 128 For the provisions relevant to flood-control activities of the Department of Agriculture, see supra, pp. 374-377. 128 Act of March 1,1917, § 3, 39 Stat. 948, 950,33 U. S. C. 701. 180 Id. lslId. |