there are a lot of “works” that are related to control stormwater runoff / flooding control stations (more than just a valve on a levee), that close / monitor the water outflow/inflow that is normally open for rice farming/storm runoff, and closes for extreme weather events, but it seems to be more than just a valve on a levee, as there are hundreds of thousands of those already - these are some kind of facility that go with that object.
I would be tempted to tag them with man_made=water_works, but it looks like that it’s only for drinking water. this is storm / flood control. Is there some other man_made=* for stormwater control works (beyond levees), or a modifier key for man_made=water_works? The thing I’m working with is called a drainage station or a pumping station for wastewater control ( 排水機場 ) . In one larger city here, (according to a city PDF http://www.city.narita.chiba.jp/DAT/000103890.pdf <http://www.city.narita.chiba.jp/DAT/000103890.pdf> page 3 [115]) there are 50 of these stations there alone. There are probably several thousand of these around Japan, and lots of other places built up that deal with flooding. https://www.openstreetmap.org/#map=19/35.80825/140.31914 <https://www.openstreetmap.org/#map=19/35.80825/140.31914> Any suggestions beyond an industrial landuse? Maybe this abandoned proposal? http://wiki.openstreetmap.org/wiki/Proposed_features/Pumping_Station <http://wiki.openstreetmap.org/wiki/Proposed_features/Pumping_Station> This area gets a ton of water. https://www.flickr.com/photos/javbw/11091220855/in/album-72157638113676925/ <https://www.flickr.com/photos/javbw/11091220855/in/album-72157638113676925/> Javbw
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