12—(1) Article 174 (interpretation of Chapter 2 of Part 6) is amended as follows.N.I.
(2) In paragraph (2)—
(a)after “of a sewer” insert “ , of a sustainable drainage system ”, and
(b)after “existing sewer” insert “ , system ”.
(3) In paragraph (4), after “drain or outfall” insert “ , or any sustainable drainage system ”.