[Tagging] Drain vs ditch

[Dave Swarthout]

Sounds good, Eugene. I like those descriptions.

On Wed, Jan 16, 2019 at 4:41 PM Eugene Podshivalov <yaugenka at gmail.com>
wrote:

> =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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-- 
Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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