Regulation 25

Any survey involving the 2.515‑metre high water mark must be referred to the Chief Surveyor together with a copy of a plan showing full relevant details.

The registered surveyor conducting the survey referred to in paragraph (1) must thereafter be informed of the accepted boundary by the Chief Surveyor.

The determination of the 2.515-metre high water mark must, where practicable, be based on nearby bench marks established by the Authority or other bench marks approved for use by the Chief Surveyor, and the permissible closing error of the levelling for such purpose must not exceed ± 15√K millimetres where K is the length of the level line in kilometres.

The reduced level of the 2.515-metre high water mark must be 0.960 metres above the datum adopted by the Authority, being Mean Sea Level.