Section 46
of Water Supply Regulations 1961 Reprinted 1999
Section 46
Every cold water storage cistern of a capacity exceeding one thousand gallons shall comply with the following requirements –
(a)
it shall be fitted with an efficient overflow pipe and, if such overflow pipe is not a warning pipe, shall also be fitted with an efficient warning pipe or some other effective device so arranged as to indicate when the water in the cistern reaches a level not less than two inches below the overflowing level of the overflow pipe;
(b)
where a warning pipe, but no other overflow pipe, is fitted, the warning pipe shall comply with the requirements of paragraphs (b) and (c) of regulation 45;
and
(c)
where both a warning pipe and an overflow pipe are fitted, the internal diameter of the warning pipe shall be not less than one inch.
Storage cistern not to be sunk in the ground.