This code list is used in association with the Physical Containment attribute which is present within the Water Link Feature Type. The code list describes whether the water network link is contained in a culvert, a tunnel or a natural subterranean passage.



In Culvert

A structure, typically a pipe or similar, that is passing below normal ground level that contains actively flowing water.

In Natural Subterranean Passage

A body of water, such as a river or stream, that is actively flowing through a natural underground channel.

In Tunnel

A long narrow passage under ground, significantly larger than a culvert, created specifically to allow excess water to flow from another watercourse, a reservoir or a facility such as a factory or power station.


The water network link is not contained in a culvert, tunnel or natural subterranean passage.

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