Tag:sinkhole=estavelle
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 sinkhole = estavelle
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| Description |
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Sinkhole through which water either emerges or disappears, depending on hydrological conditions 
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| Group: natural |
| Used on these elements |
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| Requires |
| Useful combination |
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name=* |
Status: approved
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| Tools for this tag |
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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=estavelle name:fr=Trou des Glanes refitted=yes