[Tagging] Drain vs ditch

Eugene Podshivalov yaugenka at gmail.com
Wed Jan 16 09:39:41 UTC 2019


>
> =drain
> suggested: Use waterway <https://wiki.openstreetmap.org/wiki/Key:waterway>
> =drain for artificial waterways
> <https://wiki.openstreetmap.org/wiki/Waterways>, typically lined with
> concrete or similar, usually used to carry water for drainage or
> irrigation purposes.
>
> =ditch
> suggested: Use waterway <https://wiki.openstreetmap.org/wiki/Key:waterway>
> =ditch for simple narrow artificial waterways
> <https://wiki.openstreetmap.org/wiki/Waterways>, typically unlined,
> usually used to remove storm-water or similar from nearby land. Ditches
> are usually straight (as opposed to natural streams). They may contain
> little water or even be dry most of the year – to mark this intermittent
> <https://wiki.openstreetmap.org/wiki/Key:intermittent>=yes may be used.
>

I don't know if that was done on purpose of by mistake but these
definitions are mixed up a bit. It is ditches that are used for irrigation,
not drains.
I would suggest to define them as follows.

canal - large man-made open flow (free flow vs pipe flow) waterways used to
carry useful water for transportation, hydro-power generation, irrigation
or land drainage purposes. consider using waterway=ditch for small
irrigation or land drainage channels. consider using waterway=drain for
small lined superflous liquid drainage channels.

drain - small artificial free flow waterways usually lined with concrete or
similar used for carrying away superflous liquid like rain water or
industrial discharge. consider using waterway=ditch for unlined channels
used to drain nearby land. consider using waterway=canal for large unlined
land drainage channels.

ditch - small artificial free flow unlined waterways used for irrigating or
draining land as well as for deviding land. consider using waterway=canal
for large irrigation or land drainage channels. consider using
waterway=drain for lined superflous liquid drainage channels.

No need to introduce any new tags.

Eugene

ср, 16 янв. 2019 г. в 05:12, Warin <61sundowner at gmail.com>:

> On 16/01/19 11:53, Graeme Fitzpatrick wrote:
>
>
> On Wed, 16 Jan 2019 at 10:28, Dave Swarthout <daveswarthout at gmail.com>
> wrote:
>
>>
>> Although the 1st definition sort of agrees with your usage, the common
>> definition in the U.S. is closer to the other two. There are several other
>> definitions given but most of them are similar to those two. So it will be
>> a bit confusing to use here in the U.S.
>>
>
> Now why does that amaze me! :-)
>
> irrigation channel: a passage
> <https://www.macmillandictionary.com/dictionary/british/passage> dug
> <https://www.macmillandictionary.com/dictionary/british/dug> in the ground
> <https://www.macmillandictionary.com/dictionary/british/ground_1> and used
> <https://www.macmillandictionary.com/dictionary/british/used> for bringing
> <https://www.macmillandictionary.com/dictionary/british/bring> water
> <https://www.macmillandictionary.com/dictionary/british/water_1> to land
> <https://www.macmillandictionary.com/dictionary/british/land_1> in order
> <https://www.macmillandictionary.com/dictionary/british/order_1> to make
> <https://www.macmillandictionary.com/dictionary/british/make_1> plants
> <https://www.macmillandictionary.com/dictionary/british/plant_1> grow
> <https://www.macmillandictionary.com/dictionary/british/grow>
>
>
>
> OSM gives a distinction between river and stream.
> There should be a similar distinction between 'drain' etc.
> It should not be base on the flow of water as that could be hard to
> determine - especially if the water is off when mapping.
>
> For example, 'a drain can be easily stepped over'?
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