6.—(1) If the Department considers it necessary or desirable to do so in connection with any works executed under Article 17 or 18, the Department may, on application to it by the Corporation, make an order extinguishing—
(a)any public rights over or in relation to such part of the foreshore within the designated area as is specified in the order;
(b)any public rights of navigation over such part of the river as is specified in the order.
(2) [F1Article 133(1) and (4) of, and Schedule 8 to, the Roads (Northern Ireland) Order 1993] shall apply to an order under sub‐paragraph (1) as they apply to an order under Article 6 of that Order.