Water Management Act 1999

A drainage district may be established so as to enable a water entity to undertake and manage works or do any act, matter or thing for all or any of the following purposes:

deepening, widening, straightening, diverting or otherwise improving any existing drain or outfall for water, within the drainage district, and removing obstructions to drains or outfalls for water, and raising, widening or otherwise altering any existing defence against water;

making any new drain or new outfall for water, erecting any new defence against water, erecting any machinery and doing any other act required for the drainage of the drainage district;

making, maintaining, altering or discontinuing all such works of any kind or description and erecting such buildings and machinery within the drainage district as may be necessary to carry out its responsibilities;

erecting and maintaining fences on the boundaries of any drain and providing, constructing and maintaining bridges over any drain;

erecting, constructing and maintaining dams, tanks and other means of storing and conserving water as may be necessary to carry out its responsibilities.