Section 9
SEC. 9. Subject to all existing rights, all unappropriated public waters which may be used and developed for water-power purposes shall be, and hereby are, reserved from appropriation by any person, firm or corporation under any general or special law relating to the appropriation of public waters, for the use of the National Power Corporation created by this Act: Provided, however, That the President, upon the recommendation of the Secretary of Public Works and Communications, concurred in by the National Power Board, may, from time to time, release from this reservation any unappropriated public waters which may not be necessary for the use of the National Power Corporation.