Re: [Tagging] Stormwater outlet into stream

[Warin]

On 20/09/18 11:26, EthnicFood IsGreat wrote:


Message: 3
Date: Wed, 19 Sep 2018 17:32:54 +1000
From: Jonathon Rossi <j...@jonorossi.com>
To: "Tag discussion, strategy and related tools"
    <tagging@openstreetmap.org>
Subject: Re: [Tagging] Stormwater outlet into stream
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    <CAGb9TQLCJP6tc5QiOWEU7czPTAD3+NdG1PzHY7=-rujzkvd...@mail.gmail.com>
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Thanks Graeme.


I did this:
https://www.openstreetmap.org/node/5213660838#map=19/-28.07783/153.42664 

for one stormwater drain nearby.

I don't quite understand the way extending to the north in your example
tagged just man_made=yes and surface=grass, is that the underground pipe
joining to the rest of the network?

Would that work for your purposes?
Regarding the node on the end, yes I think it should work. I always 
viewed
man_made=pipeline for legit big pressurised pipelines but I can't see 
any
harm using it for stormwater drains especially that some get really big.

man_made=pipeline
location=underground
substance=rainwater

The wiki page says man_made=pipeline shouldn't be applied to nodes but
there are already nearly 4000 so that can change, or if I have a decent
idea which way the underground pipes go (easy for the big ones) just 
map a
short way.

Thinking about how this would apply to other waterways I've mapped, I
currently map the streams or drains that pass under roads which 
rainwater
passes through like below, these are quite similar but with a completely
different tagging scheme.

waterway=drain or stream
tunnel=culvert
layer=-1

Do we use waterway=* where it is a naturally occurring stream but humans
earthfilled the location with a concrete culvert and put a road over the
top but that is still part of the earth's waterways of the creek system.
Can't be true because waterway=drain is for man made waterways.

This tagging also appears valid for a big stormwater drain where you can
walk into it:

waterway=drain
tunnel=flooded
location=underground
(https://wiki.openstreetmap.org/wiki/Tag:tunnel%3Dflooded)

Unfortunately it doesn't render in any way, so there's nothing 
showing on
the map to indicate that there's anything there, until you go into edit
mode :-(

I'm not too worried about rendering. In the past I've left a note on the
first node because these drain outlets usually can't be seen from aerial
imagery and many times the creek directly where it pours doesn't even 
look
like a creek from aerial imagery, so the intention was to capture the
information to ensure armchair mappers don't "fix" the creek.

As usual each time I post on the mailing list it opens a can of worms 
and I
learn too much about all the different possible tags :).
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I think what you are mapping would more properly be called a storm 
sewer, not a pipeline.  I think of a pipeline as carrying contents 
under pressure, whereas a storm sewer is gravity-fed.  Therefore I 
think a better tag would be man_made=sewer.

There are differences between drinking water, storm water and sewer water!
You do not want sewer water discharging directly into a local river, 
where as storm water is much more acceptable.
Please don't mix the terms as has been done above, 'storm sewer' is not 
a term that should be used.

If a pipeline is pressured or not makes little difference to the pipe. 
If you want you can specify the pressure in the pipeline using the tag 
pressure=* .. the wiki says to use bar .. so pressure=1 would be about 
atmospheric pressure i.e. not pressurised.



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