Sections
323 to
328 of this title shall not in any manner amend or repeal the provisions of the Federal Water Power Act of June 10, 1920 (
41 Stat. 1063), as amended by the Act of August 26, 1935 (
49 Stat. 838) [
16 U.S.C.
791a et seq.], nor shall any existing statutory authority empowering the Secretary of the Interior to grant rights-of-way over Indian lands be repealed.