The power of the appropriate agency under section 143 of the Water Resources Act 1991 to make an application for the imposition of tolls in respect of navigation shall, in the case of waters within an internal drainage district which do not form part of a main river, be exercisable by the drainage board for that district, concurrently with the appropriate agency.
Subsection (4) of section 143 of the Water Resources Act 1991 shall have effect in relation to tolls imposed, by virtue of this section, on the application of an internal drainage board as if the reference in that subsection to the appropriate agency were a reference to that board.