9.—(1) In this Order—
(a)“sewer” has the same meaning as in the Water and Sewerage Services (Northern Ireland) Order 1973(1),
(b)“public sewer” means a sewer which is vested in the Department.
(2) References in this Order to apparatus include a sewer, drain or tunnel.
(3) References to the undertaker in relation to such apparatus, or in relation to street works in connection with such apparatus, shall be construed—
(a)in the case of a public sewer, as references to the Department, and
(b)in any other case, as references to the authority, body or person having the management or control of the sewer, drain or tunnel.