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Public-images-osm logo.svg waterway = spillway
Llyn Brianne spillway.jpg
A structure allowing the controlled release of water from a waterbody (reservoir, canal, river) Show/edit corresponding data item.
Group: waterways
Used on these elements
should not be used on nodesmay be used on waysmay be used on areas (and multipolygon relations)should not be used on relations (except multipolygon relations)
Useful combination
Status: deprecatedPage for proposal

A structure which allows the release of water from a water body, either under controlled circumstances or as a means of ensuring that water levels do not overtop and destroy containing structures (dams, levees). Spillways will normally be free of water.

Spillways may be in regular use or designed only to be used in emergencies.

How to map

  1. Smaller spillways, or those parts which are within the dam structure, can be drawn as a way way and tagged with waterway=spillway.
  2. Larger ones can be drawn as an area area and tagged with waterway=spillway,area=yes.

The spillway should connect to the water body which it drains and to the downstream outlet.

The material=* of the spillway should be added. The recent near collapse of the [W] Oroville Dam was in part precipitated because the emergency spillway was largely earth.

Wikipedia mentions different types of spillways, use spillway:type=* to describe these.

Related tags

See also