Criminal Code Act 1899

Any person who—

wilfully and unlawfully removes or disturbs any fixed object or materials used for securing a bank or wall of the sea, or of a river, canal, aqueduct, reservoir, or inland water, or for securing any work which appertains to a port, harbour, dock, canal, aqueduct, reservoir, or inland water, or which is used for purposes of navigation or lading or unlading goods; or

unlawfully does any act with intent to obstruct the carrying on, completion, or maintenance, of the navigation of a navigable river or canal, and thereby obstructs such carrying on, completion, or maintenance;

is guilty of a crime, and is liable to imprisonment for 7 years. sch 1 pt 6 div 2 ch 46 s 473 amd 1986 No. 1 s 71; 1988 No. 88 s 5 sch 2