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Water Management Act 2000 No 92
Current version for 1 July 2019 to date (accessed 20 September 2019 at 10:22)
4A Meaning of “overland flow water”
(1) In this Act, overland flow water means water (including floodwater, rainfall run-off and urban stormwater) that is flowing over or lying on the ground as a result of:(a) rain or any other kinds of precipitation, or(b) rising to the surface from underground, or(c) any other process or action of a kind prescribed by the regulations.(2) Water is flowing over the ground for the purposes of subsection (1) even if it flows over the ground by means of artificial structures such as roads, canals or road gutters.(3) However, subsection (1) does not include:(a) water that is collected from a roof (including water collected from a roof using a rainwater tank), or(b) water that is flowing over or lying on the bed of a river, lake or estuary, or(c) water flowing over or lying on the ground in such circumstances as may be prescribed by the regulations.