1(1)In this Schedule “drainage system” means a structure designed to receive rainwater except—
(a)a public sewer, or
(b)a natural watercourse.
(2)The reference to a structure includes a reference to—
(a)any part of an existing or proposed structure, and
(b)any feature or aspect of a design that is intended to receive or facilitate the receipt of rainwater.
(3)“Public sewer” has the meaning given by section 219(1) of the Water Industry Act 1991.
(4)“Natural watercourse” means a river or stream.