If a local authority, in lieu of executing works of maintenance only to any length of a public sewer to which this section applies, improve or enlarge that length of sewer for the purpose of enabling it to serve additional premises, they shall be entitled to recover under the last preceding subsection from the owners of the premises served by the existing sewer such sum only as they might reasonably have expended in executing works of maintenance necessary to make that length of sewer adequate for draining the premises served by it immediately before the improvement or enlargement was undertaken, and for the purposes of any future works of maintenance that length of sewer shall cease to be a length of sewer to which this section applies.
Any question arising under this section as to whether any length of sewer is one to which this section applies, as to the necessity for any work carried out by a local authority, as to the amount, or the reasonableness, of the expenses incurred by them, or as to the fairness of any division or apportionment of expenses made by them, may be determined by a court of summary jurisdiction either in proceedings taken by the local authority for the recovery of expenses incurred by them, or on the application of any owner concerned.
This section applies to any length of a public sewer, being either—
So much of any local Act as relates to the liability for the repair of a single private drain connecting two or more houses with a public sewer is hereby repealed.