The provisions were carried forward from the Local Government Act 1972 and were made before the advent of the possibility of developments such as tidal lagoons.
Cafodd y darpariaethau eu dwyn ymlaen o Ddeddf Llywodraeth Leol 1972 a chawsant eu gwneud cyn y posibilrwydd o ddatblygiadau fel môr-lynnoedd llanw.