4.—(1) Article 159 (adoption) is amended as follows.
(2) In the heading, after “sewers” insert “, sustainable drainage systems”.
(3) In paragraph (2)—
(a)after “lateral drain”, in the first place those words occur, insert “, sustainable drainage system”, and
(b)after “lateral drain”, in the second place those words occur, insert “, system”.
(4) In paragraph (4)(a), after “lateral drain” insert “, system”.
(5) In paragraph (5)—
(a)in sub-paragraph (a), after “sewer” insert “, system”;
(b)in sub-paragraph (b), for “or lateral drain” substitute “, lateral drain or system”;
(c)in sub-paragraph (c), for “or lateral drain” substitute “, lateral drain or system”;
(d)in sub-paragraph (d), after “lateral drain” insert “, system”.
(6) In paragraph (6), for “or lateral drain” (in both places) substitute “, lateral drain or system”.