in subsection (4), for the words from “controlled by” to “internal drainage board” and “the board” there shall be substituted, respectively, the words “ controlled by the National Rivers Authority or any internal drainage board ” and the words “ that Authority or, as the case may be, that board ”; and

in subsection (10), for the words from “byelaws”, in the first place where it occurs, onwards there shall be substituted the words “ byelaws made by virtue of paragraph 5 of Schedule 25 to the Water Resources Act 1991 or section 66 of the Land Drainage Act 1991 ”.