[Tagging] tagging the landuse of resevoirs & basins.

[John Willis]

When mapping stormwater reservoirs and basins here in Japan, they often have a mappable landuse around them - the land around the basin is controlled, often with an access road and and fence of some type. 

Mapping the water feature is easy, but what is the landuse of the entire facility? it is 10% larger than the basin itself.


Here is a good example - the small amount of land around this basin “belongs” to the basin. the access road belongs to it. It is not a park nor are the access roads for private property. they are just there to access the basin in an emergency (a breach, cleaning etc). 

https://www.openstreetmap.org/way/791956035 <https://www.openstreetmap.org/way/791956035>  <-mapped landuse example

other examples that could be mapped in a similar fashion:
https://www.openstreetmap.org/#map=17/36.28832/139.42927 <https://www.openstreetmap.org/#map=17/36.28832/139.42927>
https://www.openstreetmap.org/#map=18/36.27943/139.43071 <https://www.openstreetmap.org/#map=18/36.27943/139.43071>
https://www.openstreetmap.org/#map=18/36.29622/139.39674 <https://www.openstreetmap.org/#map=18/36.29622/139.39674>
https://www.openstreetmap.org/#map=18/36.34744/139.32669 <https://www.openstreetmap.org/#map=18/36.34744/139.32669>
https://www.openstreetmap.org/#map=17/36.05560/139.60083 <https://www.openstreetmap.org/#map=17/36.05560/139.60083>



In many instances, emergency stormwater basins are in parks or large factories - making them a feature of that larger landuse.
I'm not talking about these. 

Examples of what I’m not talking about:
https://www.openstreetmap.org/#map=16/36.2707/139.4148 <https://www.openstreetmap.org/#map=16/36.2707/139.4148>
https://www.openstreetmap.org/#map=17/36.22028/139.64998 <https://www.openstreetmap.org/#map=17/36.22028/139.64998>
https://www.openstreetmap.org/#map=16/36.1037/139.6329 <https://www.openstreetmap.org/#map=16/36.1037/139.6329>


I’m talking about the dedicated land only used for the man-made basins and no other usage, controlled via barriers, and mappable via imagery. 

I suggest landuse=industrial + industrial=water  or similar for all man-made water related features that isn’t a plant of some kind (ones dedicated to filtering, treating, or pumping the water). 

similar to landuse=railway, there is more land dedicated to these features than just the mappable feature itself. 

https://taginfo.openstreetmap.org/keys/?key=industrial#values <https://taginfo.openstreetmap.org/keys/?key=industrial#values>

taginfo says this combination currently has 60 uses (#2 for all “water” values), and “water_storage” has 1. 

thoughts?

Javbw
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