Paragraph 66 I1

If during the construction of a specified work or a protective work or during a period of 24 months after the completion of those works any alterations or additions, either permanent or temporary, to the waterway are reasonably necessary in consequence of the construction of the specified work or the protective work in order to avoid detriment, and the Trust gives to the Council reasonable notice of its intention to carry out such alterations or additions (which must be specified in the notice), the Council must pay to the Trust the reasonable cost of those alterations or additions including, in respect of any such alterations and additions as are to be permanent, a capitalised sum representing the increase of the costs which may be expected to be reasonably incurred by the Trust in maintaining, working and, when necessary, renewing any such alterations or additions.

If the cost of maintaining, working or renewing the waterway is reduced in consequence of any such alterations or additions a capitalised sum representing such saving must be set off against any sum payable by the Council to the Trust under this paragraph.