Section 10 of the Act of March 3, 1899, popularly known as the Rivers and Harbors Appropriations Act of 1899, referred to in subsec. (a), means section 10 of act Mar. 3, 1899, ch. 425, 30 Stat. 1151, known as the Rivers and Harbors Appropriation Act of 1899, which is classified to section 403 of Title 33, Navigation and Navigable Waters.