Sections 323 to 328 of this title shall not in any manner amend or repeal the provisions of the Federal Water Power Act of (), as amended by the Act of () [ et seq.], nor shall any existing statutory authority empowering the Secretary of the Interior to grant rights-of-way over Indian lands be repealed.41 Stat. 106349 Stat. 83816 U.S.C. 791aJune 10, 19201920-06-10August 26, 19351935-08-26