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19.—(1) Article 4 applies to an activity carried on for the purpose of maintaining any—
(a)coast protection works;
(b)drainage works; or
(c)flood defence works.
(2) Paragraph (1) is subject to the condition is that the activity is carried on within the existing boundaries of the works being maintained.
(3) But Article 4 does not apply—
(a)in relation to any such activity which consists of beach replenishment; or
(b)to an activity that causes or is likely to cause obstruction or danger to navigation.