Changeset: 148794683
Added ford=yes to section of Greenbelt Bikeway that goes through the Copper Slough.
Closed by ExpresswayDave
Tags
created_by | JOSM/1.5 (18969 en) |
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source | Bing; knowledge |
Discussion
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Comment from garybikes
Heyo, I edited this a while back and I wasn't entirely sure how to express what's happening here. As far as I can tell it's less of a ford and more of a flooded cycleway. "ford" to me implies a stream crossing which this is not -- it looks to me like the stream used to be redirected adjacent to / underneath the cycleway, but eventually overflowed and now covers the cycleway (which is why the cycleway now detours by the train tracks). What do you think of maybe removing the ford and adding tunnel=flooded to the cycleway?
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Comment from ExpresswayDave
I need to get the photographic evidence that supports this, but in a word: no. The reason why is that the stream doesn't go underneath the cycleway, but instead goes parallel to the now-abandoned section of cycleway in the same culvert. The cycleway then crosses the stream via what I mapped as a ford (there's no bridge, it just goes right into the stream, hence why I mapped it as a ford) to continue south as mapped. I mapped the abandoned section of cycleway as such, which is why it doesn't show up in OSM's rendering, but does show up in editors like JOSM. That's also why I mapped the practical altenate route as "Greenbelt Bikeway (detour)."
I documented this in my user diary entry entitlted "Greenbelt Bikeway Edits" on 11 April 2020, which you can find here: https://www.openstreetmap.org/user/ExpresswayDave/diary/392694
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Comment from garybikes
Went over and re-checked and learned something new. The flooding on the cycleway is intermittent and depends on the water level of the stream. At present, the cycleway is clear all the way up to the sourthern mouth of the tunnel and then becomes blocked with dirt. Last time I checked (when I made my edits, a few months ago), the water level was over the cycleway. I've got photographs, but I'm not sure what the best way to share them is. So, in conclusion I think you've gotten it right -- the only change needed would be marking the flooded tunnel and ford as intermittent. If that sounds appropriate to you then I'm happy to figure out the best tags to do that.
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Comment from ExpresswayDave
Funny you should say that, because I just checked it out myself today with my body cam recording and mounted to the handlebars of my bike, and after seeing the water level below that of the cycleway and that it was passing under via a couple of large pipes that could be considered a mini-culvert I'm ready to concede that you were correct and that I was wrong! A ford is generally built (or is naturally-occuring) such that the water is flowing across the way all the time, but here it looks like the Champaign Parks District at least attempted to have the cycleway cross above the water level, even though it doesn't take much more flow for it to rise above the level of the cycleway and turn it into a ford. Which explains why when I first checked it out back in 2020 and then again sometime later the water was flowing over the cycleway.
It's too bad OSM doesn't have a way to upload photographs as I could get stills from my video and upload them and along with your photographs we could compare notes. I suppose I could set up a (temporary) web server for the purpose but I'm not sure I'm willing to go that far.
Bottom line: if you want to change it to be temporarily flooded from a ford, go ahead.
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