Talk:Tag:tunnel=flooded

Difference between tunnel=flooded and tunnel=yes for waterway=canal?

The current page does not clearly distinguish between this newer tag tunnel=flooded and tunnel=yes for waterway=canal.

How should a mapper determine which tag to use? Why is the new tag tunnel=flooded needed? --Jeisenbe (talk) 23:44, 28 May 2019 (UTC)

I've added a first try of sentence toter describe difference with tunnel=yes. It's important to state if water prevent anyone to go through the tunnel in operation. Fanfouer (talk) 11:10, 29 May 2019 (UTC)

"tunnel=yes where a path is usually intended for human to safely pass and where water level is usally controlled for safety reasons" - I think this definition of tunnel=yes may be too specific.

Since tunnel=yes is an in-use (or de facto) tag, I think you should base it's definition off of actual usage. Please check some of the real openstreetmap data in areas that you know and check how tunnel=yes is being used.

As I want to make a distinction between de-facto usage (that's why I state *usually* intended) for common tunnels (usually intended for highway=*, then railway=*) and tunnel=culvert which was pretty dedicated to waterways, I introduced tunnel=flooded.

It clearly differs from highway/railway tunnels and culverts (culverts doesn't cover large tunnels).

I have not yet done this, but I know that I've used tunnel=yes for paths waterway tunnels that do not have any control of the water level, and where there is no walkway. Since there has been no specific wiki page for tunnel=yes, I don't think tunnel=yes has been used in a very specific sense for waterways. And the proposal that created tunnel=flooded did not suggest redefining the meaning of tunnel=yes --Jeisenbe (talk) 11:51, 29 May 2019 (UTC)

My point wasn't to redefine tunnel=yes, sorry if I've been mistaken for that. It's only about how tunnel=flooded is different from road/railway tunnels which are mainly described with tunnel=yes.

Look at those two pictures : tunnel=flooded with waterway=* and tunnel=yes with waterway+pipeline. Fanfouer (talk) 20:29, 29 May 2019 (UTC)

tunnel=flooded vs tunnel=pressurised

There are many places where the inntake is above the water level. Basically at the side of the reservoir with a top above highest regulated level and bottom at lowest regulated level.
The tunnel then becomes flooded with water inside. Is this then pressurised or flooded? --Gazer75 (talk) 17:23, 29 May 2019 (UTC)

It is relevent to use waterway=pressurised vs waterway=canal (or waterway=drain). See table in waterway page. In both situation the tunnel is flooded. Fanfouer (talk) 20:21, 29 May 2019 (UTC)

Consistent definition of tunnel=flooded still needed

Unfortunately the original proposal did not really define tunnel=flooded, nor did it clearly list it as a proposed new tag. (This is why I think it is so important to have a short, clear "proposal" section at the beginning of a proposal which lists each new tag and their definition and any other tags which are changed, Fanfouer).

Now this page says: "A long (>100m) tunnel where flowing water or other fluid prevent humans from safely walking inside"

But it also says: "A flooded tunnel is an artificial structure intended to channel water on a significant distance. Its dimensions and length allow human to fit inside but safe walking is impossible due to high amount of water or other fluid expected in operation."

"Such tunnels are different from tunnel=culvert where human usually can't enter and for which dimensions are restricted to building or way it is supposed to go underpass."

"They are also different from tunnel=yes where a path is usually intended for human to safely pass and where water level is usally controlled for safety reasons"

But Tag:tunnel=culvert just says "You may use tunnel=flooded to map larger and longer tunnels used to channelise any fluid."

And Key:tunnel says: "Where the water from a smaller stream, drain or even cattle crossing passes under a way structure or a building consider using tunnel=culvert in place of the tunnel=yes used for accessible and larger tunnels for roads or railways." "When the waterway=* runs underground for a considerable distance, you can use tunnel=flooded especially when the duct isn't designed to be safely accessible in operation or man_made=pipeline for sections built with tube assemblies."

Key:waterway says: "A long (> 100 m) tunnel where flowing water or other fluid prevent humans from safely walking inside despite its appropriate diameter or size. Water inside can be pressurised or not, used in combination with any waterway=* linear value."

It needs to be more clear when mappers should use tunnel=flooded and when they should use tunnel=culvert or tunnel=yes. Should a waterway=river every be tunnel=flooded, or is it then a canal? How safe for walking does the tunnel have to be? What about if a boat can go through the tunnel, but you can't walk? --Jeisenbe (talk) 23:37, 21 March 2020 (UTC)

tunnel=flooded should be flooded=yes

tunnel=flooded prevents the type of tunnel being tagged. Flooding is an attribute of a tunnel, not an actual type of tunnel.

See Proposal:Hydropower_water_supplies, tunnel=flooded was introduced to differ from tunnel=culvert for longer tunnels intended to channel water.

Such tunnel 310730350 310730350 is not a culvert for instance and I see no point to use tunnel=yes + flooded=yes Fanfouer (talk) 15:46, 5 March 2024 (UTC)