The Authority may take such action as it considers appropriate (if any) for the purpose of preventing, or mitigating the effect of, the discharge of water from a coal mine into or on to any land or into any controlled waters.
In this section and sections 4B , 4C and 4CA below—
"controlled waters" has the meaning given by section 104 of the Water Resources Act 1991; and
references to coal mines are to coal mines vested in the Authority.