[Tagging] Drain vs ditch

Eugene Podshivalov yaugenka at gmail.com
Wed Jan 30 10:15:41 UTC 2019


ср, 30 янв. 2019 г. в 13:02, Warin <61sundowner at gmail.com>:

> Large means?
> Small means?
>
> To me I'd use small = I can step over it, large means I cannot step over
> it .. so ~1.1 metres is the line between the two.
>
Drains and ditches can be 0.1 to 5 metres wide. You can hardly step over a
2-5 metre wide ditch, can you? Anything greater than that can be called a
canal.
So I would leave this up to the user to decide on.

Cheers,
Eugene


ср, 30 янв. 2019 г. в 13:04, Joseph Eisenberg <joseph.eisenberg at gmail.com>:

> Those descriptions look good
> On Wed, Jan 30, 2019 at 5:58 PM Eugene Podshivalov <yaugenka at gmail.com>
> wrote:
>
>> Here is a summary of the discussion to check if there is a consensus.
>>
>> Current definitions of artificial waterways are unclear and ambiguous.
>> Some people assume that ditch and drain differ mainly in size, others
>> differentiate them mainly on liquid type (can or cannot carry industrial
>> discharge), others rely on lined or unlined characteristic.
>>
>> It is suggested to resolve the ambiguities by updating the definitions 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 usually 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 without letting it soak into the ground. Consider
>> using waterway=ditch for unlined channels used to drain nearby wet land.
>> Consider using waterway=canal for large unlined land drainage channels.
>>
>> ditch - Small artificial free flow waterways used for irrigating dry land
>> or draining wet land. Irrigation ditches can be lined or unlined, drainage
>> ditches are usually unlined to let water soak through the land into them.
>> Ditches may have short lined segments at waterway turning points or
>> intersections with roads or paths to prevent erosion. Consider using
>> waterway=canal for large irrigation or land drainage channels. Consider
>> using waterway=drain for usually lined superflous liquid drainage channels.
>>
>> Cheers,
>> Eugene
>>
>> вт, 29 янв. 2019 г. в 18:32, marc marc <marc_marc_irc at hotmail.com>:
>>
>>> Le 29.01.19 à 16:13, Eugene Podshivalov a écrit :
>>> > How to we proceed with this topic? Should a proposal be created or the
>>> > wiki pages can be updated straight away by someone or myself based on
>>> > this discussion?
>>>
>>> maybe it's a good idea to write a small-summary-only post
>>> to check if there is a consensus on this, because there are probably
>>> many participants who have dropped out given the number of emails that
>>> the subject has generated
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