Tag:waterway=dam

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Public-images-osm logo.svg waterway = dam
Amagase Dam.jpg
Description
A wall built across a river or stream to block and regulate the flow of the river
Used on these elements
should not be used on nodesmay be used on waysmay be used on areasuse on relations unspecified
Useful combination
Status: Approved

A wall built across a river or stream to impound the water. A dam normally does not have water flowing over the top of it.

Sometimes there is a waterway=fish_pass around it.

How to Map

  1. Smaller dams can be drawn as a way Way and tagged with waterway=dam.
  2. Bigger dams can be drawn as an area Area and tagged with waterway=dam + name=*.

Validators and QA tools generally want that the waterway=river have shared node(s) with the waterway=dam if and where they cross it. If the river runs in a tunnel well underneath the dam it should be mapped as waterway=river + tunnel=yes + layer=-1 without any shared nodes with the dam.

Example

small dam as a way Way big dam as an area Area

The artificial lake created by the water impounded behind the dam wall (commonly called a 'dam' in Australia) should be tagged as natural=water + water=reservoir or water=pond as appropriate.

(High-)ways over a dam

This subject was not part of the proposal but the most straightforward solution is that the highway=* and waterway=dam share a way.

Validators and QA tools may complain about this combination because many have an overly generic rule saying that highways and waterways can not share a single way - this is one of the valid exceptions and tools should be fixed to accept it.

Related tags: