How to tag permanent dry bodies of water as dry abandoned meanders?
Are they permanently dry, as in they will never run again, or have they just been dry for quite a while, but when it rains sufficiently well “up there”, the rivers will run again?
In this case, if it rains sufficiently, yes, they will run again.
In that case, waterway=stream + intermittent=yes should fix it.
I have doubts about tagging with intermittent=yes, because these dry bodies of water are not seasonal, they will run sometimes.
intermittent=yes is the
only (edit: most commonly used) established tag for features that are sometimes water covered and sometimes not. I could see how some additional nuance could make sense to distinguish a stream that is dry in one season and wet in another from one that has water only a few times in a decade. How often might are the ones in question have water?
Only in a flood. But I need a tag that is not the same as the rest of the floodplain.
There’s “flood_prone” too, and a bunch of basin features are by their very nature intermittent too.
In this case though, as you say, "
intermittent=yes" sounds like the best tag.
Edit: I might as well link to an example of a map rendering that tries to differentiate between them. At that link, solid blue is water all the time, closely spaced blue hatching is “intermittent=yes” (if it rains a lot, that’ll be under water), and the widely spaced blue hatching is flood_prone=yes (if the river floods (less often than heavy rain), that area will be under water).
Oh good point. I spoke too soon
In conclusion, I think this is the better possible tag scheme for this situation. Perhaps, a tag is missing to define seasonality, such as seasonal=yes or seasonal=no (these tags do not exist), for bodies of water with intermittent=yes.
I was also going to mention seasonal, but I thought that from your description - been dry for many years, that it wouldn’t apply!
Great @SomeoneElse ! I searched by seasonal and didn’t find it.
Context: These bodies of water are in the Lower São Francisco River in Brazil. 40 years ago, they were seasonal. But, in recent years no more, because there is a dam in the river.