[Tagging] Evaporation ponds

[Joseph Eisenberg]

I like basin=evaporation - it certainly seems to fit in with
basin=retention/detention/infiltration, as long as we clarify that
landuse=salt_pond is already the "de facto" tag for sea salt evaporation
ponds (aka salt pans, salterns), since these have a rather different
function.

-- Joseph Eisenberg

On Wed, Jan 13, 2021 at 9:27 PM Brian M. Sperlongano <zelonewolf at gmail.com>
wrote:

> I have been investigating the objects that are currently tagged
> reservoir_type=evaporator to understand how those features fit in our
> emerging definition[1] of "reservoir".  This is a small category at present
> (442 objects), and they seems to fit into the following categories:
>
> 1. Possible tailings ponds mis-tagged as evaporation reservoirs
> 2. Industrial ponds associated with chemical production (potash is a
> common example)
> 3. Basins associated with water purification
> 4. Man-made rectangular/polygonal bodies of water with unclear usage
>
> I've compiled a list of examples[2] for inspection.
>
> Presumably, the purpose of an evaporator pond/basin is to evaporate water
> from a solution, leaving behind a precipitate which is harvested.  The most
> obvious usage is a salt pond, which already has its own dedicated tag in
> landuse=salt_pond.
>
> The question is two-fold:
>
> 1. Would we consider any of these features to be "reservoirs"?
>
> 2. If evaporation ponds are NOT reservoirs, how should they be tagged?
>
> It seems that we need new tags.  The options that come to mind are
> basin=evaporation (combined with either landuse=basin or
> natural=water+water=basin).  Note that the "landuse=basin" version is quite
> reasonable here if there is a wet->dry->harvest cycle.
>
> The other option is new tagging under the man_made=* key, similar to what
> we did with the tailings ponds proposal[3].
>
> If new tagging is created for evaporator, I would suggest also that the
> key resource=* be used to tag the specific precipitate that the evaporation
> pond is being used to extract.
>
> [1] https://wiki.openstreetmap.org/wiki/Proposed_features/Reservoir
> [2]
> https://wiki.openstreetmap.org/wiki/User:ZeLonewolf/Analysis/Evaporator
> [3] https://wiki.openstreetmap.org/wiki/Proposed_features/Tailings_pond
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