The Commissioners of Public Works were not consulted when the weir in question was originally constructed in 1982 in connection with local fish farm operations and they received no complaints of flooding as a result.
In November 1986 the commissioners consented, under section 47 of the Arterial Drainage Act, 1945, to alterations to the weir which had been carried out earlier that year. In giving consent the commissioners had regard for assurances given by the owners of the weir that the alterations, which involved lowering the crest level, would not raise water levels upstream and would in fact improve the existing situation in times of high flows.
The commissioners explicitly pointed out that consent was given for the purpose of the 1945 Act only and did not absolve the developer from liabilities to third parties. Accordingly, if there is any dispute in relation to flooding it is a matter for the developer and the affected landowners.