Subject to subsections (2) to (4) below, the Corporation shall, in any area in England and Wales outside the Doncaster Drainage Area, from time to time carry out—
such measures (if any) for remedying, mitigating or preventing any deterioration in a land drainage system, by reason of subsidence damage which has occurred or appears likely to occur, as may be reasonably required by the appropriate drainage authority.
The Corporation may elect, in respect of any such measures, not to carry out the measures themselves but to make to the appropriate drainage authority—
and in this subsection "the appropriate amount" means such aggregate amount as may be agreed or determined to be reasonable in all the circumstances, having regard to the expenditure which would have been incurred by the Corporation or by the authority in carrying out the measures.
The Corporation—
but the Corporation shall not be deemed to act unreasonably in refusing any such request received after the Corporation have begun to carry out the measures.
Notwithstanding anything in subsections (1) to (3) above, in any case where it is agreed or determined to be appropriate, the liability of the Corporation for the cost of any recurring measures may be discharged by a lump sum payment agreed or determined to represent the capital amount of that cost.
Section 16 above (except subsections (6) to (8)) shall apply in any case where—
is likely to be so affected by operations under this section, or under Part II of the Doncaster Area Drainage Act 1929, as to make it unreasonable that those works should be executed for the time being;
and in its application to any stop notice given by virtue of this subsection, section 17(1) above shall have effect as if it referred to the Corporation no longer being of such opinion as is mentioned in paragraph (b) above.
The Corporation shall, for the purpose of carrying out any measures under this section, have the like powers—
as are conferred on the appropriate drainage authority by the enactments relating to land drainage; but nothing in this subsection shall apply in relation to any land occupied by or on behalf of the Crown.
Regulations made by the Secretary of State and the Minister of Agriculture, Fisheries and Food acting jointly may make provision—
In this section—
"agreed or determined" means agreed between the Corporation and the appropriate drainage authority or, in default of such agreement, determined in the manner provided by regulations under this section;
"the appropriate drainage authority" means—
"the Doncaster Drainage Area" has the same meaning as in the Doncaster Area Drainage Act 1929;
"land drainage system" means a drainage system maintainable by a drainage authority;
"main river" means a main river for the purposes of Part IV of the Water Resources Act 1991.