Tag:sinkhole=estavelle

sinkhole = 
Description
Sinkhole through which water either emerges or disappears, depending on hydrological conditions Show/edit corresponding data item.
Group: natural
Used on these elements
may be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
Requires

natural=sinkhole

Useful combination

name=*

Status: approvedPage for proposal
More details at taginfo
Tools for this tag

An estavelle is a sinkhole, typically connected to a waterbody, which can act as a ponor or as a karst spring, depending on hydrological conditions:

  • if the groundwater level inside the karst system rises, the estavelle acts as a discharge, allowing the karst water to flow out forming a surface waterway
  • on the contrary, with falling water levels, the estavelle acts as a ponor, swallowing surface water and draining it to the karst groundwater system.

An estavelle may be on the path of a waterway, or connected to a main waterway by a small one, whose flow will change according to the respective water levels of the karst system and of the waterway; if in the second case, use flow_direction=both to highlight the flow variations of the connecting waterway.

Example

The Trou des Glanes, an estavelle in France, would be tagged this way: 

natural=sinkhole
sinkhole=
name:fr=Trou des Glanes
refitted=yes

See also

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