[Tagging] Drain vs ditch

[Eugene Podshivalov]

I have no objection to remove the lined/unlined characteristic from the
definitions but am not sure about leaving just one tag for both "ditch" and
"drain" notions.
Here are some examples to consider.

1. Industrial drains are not always digged out. The channal in the ground
may get formed by the liquid itself discharged from a pipe or culvert.
https://c8.alamy.com/comp/MFC9WA/the-industrial-wastewater-is-discharged-from-the-pipe-MFC9WA.jpg
https://4.bp.blogspot.com/-2TCd0OHetNo/WzYi3_5n1lI/AAAAAAAAEiE/5V05A6jLL9Q_BssVLQhX7csbReaqBbbTgCLcBGAs/s320/Liquid%2BWaste%2BManagement.jpg

2. Shallow lined storm channals along paths and road are normally called
"drains", not "ditches".
https://thesquirrelnutwork.files.wordpress.com/2013/02/img_1578_2.jpg
http://sussexcountyconcrete.com/wp-content/uploads/2015/05/IMG_0216-1080x810.jpg

3. Storm water culverts are also normally called "drains", not "ditches".
http://coastalgunite.com/wp-content/uploads/project-congressional-towers0.jpg
https://www.theurbanexplorer.co.uk/wp-content/uploads/2013/02/bourne-valley-culvert-bournemouth-dorset-10_8465421336_o-1400x937.jpg

On the other hand, if industrial discharge is running along a digged out
channal (lined or unlined) then you can call it a "ditch".
If a storm channal (lined or unlined) is deep enough to step into it, you
can call it a ditch as well.

Cheers,
Eugene

сб, 2 февр. 2019 г. в 16:23, Hufkratzer <hufkratzer at gmail.com>:

> If we were discussing a proposal I would agree, but replacing
> waterway=drain by waterway=ditch + usage=drainage or sth. like that is
> not such an easy task.  We already have 800k drains. I assume it
> requires a proposal with volting to deprecate drain, adaption of the
> presets, perhaps a mass edit. Who will do all this? Is the advantage of
> using waterway=ditch + usage=drainage instead of waterway=drain so
> immense that it is worth the effort?
>
> Am 02.02.2019 13:58, schrieb nwastra:
> > +1
> >
> > N
> >
> >> On 2 Feb 2019, at 10:39 pm, Markus <selfishseahorse at gmail.com> wrote:
> >>
> >>> On Sat, 2 Feb 2019 at 11:21, Sergio Manzi <smz at smz.it> wrote:
> >>>
> >>> Thank-you for confirming that, Mark.
> >>>
> >>> Personally I think we, in OSM, should stop with this folly of
> overloading English words with meanings they do not have in any dictionary
> (be it AmE, BrE, CaE, or whatever).
> >>>
> >>> Both the "ditch" and "drain" words can be used to describe certain
> features in English. The difference is essentially an etymological one,
> with one related to the process of excavation (dig -> ditch) and the other
> to the function of carrying liquids away (dry -> drain).
> >>>
> >>> If we want to precisely map certain characteristics of a feature we
> should do it explicitly through a correct data model that takes into
> consideration the particular aspect we are trying to communicate. We want
> to communicate the information that a (small) waterway is lined with
> concrete? Just say that with an appropriate tag, like e.g. lined=*, or
> lining=*. We want to communicate the information that a (small) waterway is
> used to carry waste water away? Once again, let's say that with an
> appropriate tag, like e.g. usage=* (please ignore if the specific tags I
> put in the examples are not of your liking: not the point here, let's
> discuss that later...).
> >>>
> >>> Arbitrarily overloading words with meanings they do not have in the
> common language is just a perfect way to Babel, that is a reduction in
> information.
> >> + 1
> >>
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