Tag:sinkhole=doline

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Public-images-osm logo.svg sinkhole
Causse de Sauveterre doline.jpg
Description
A sinkhole clogged up, sometimes only partly, with earth or debris
Group: Natural
Used on these elements
may be used on nodesshould not be used on waysmay be used on areasshould not be used on relations
Requires

natural=sinkhole

Useful combination
Wikidata
Status: approvedPage for proposal

A doline is a sinkhole whose orifice is clogged up, sometimes only partly, with earth or debris, and which, when filled, generally looks like an old crater with flat, fertile ground. When fully clogged up, it often contains a pond from trapped rainwater, no longer able to escape by the clogged bottom; when only partly clogged up, the pit still reaches the surface; a doline can form around an estavelle, a ponor, a karst spring or a blue hole. This is one of the sinkholes a polje can contain.

A doline, when fully clogged up, often contains a waterbody; if so, tag it natural=water+water=+sinkhole=doline, to represent the fact that the sinkhole feature is a characteristic of the water body.

A doline can contain another karst feature, like a pit or a ponor, as it frequently forms around them; if the doline is large enough to be considered a separate feature, map the other feature inside as the sinkhole, with natural=sinkhole+sinkhole=* and as the last or first node of the linked waterstream, if any, in order to link it with the sinkhole in the OSM database. Then, map the surrounding of this sinkhole as it is, for instance using natural=cliff.

Example

Lavogne causse blandas.jpg

This doline, on the Wikipedia-16px.png Causse de Blandas, is a Wikipedia-16px.png lavogne, i.e. a doline which has been refitted as a watering place for herds, and would mapped as an area with the following tags:

natural=water
water=pond
sinkhole=doline
amenity=watering_place

See also