[Tagging] Drain vs ditch
joseph.eisenberg at gmail.com
Wed Jan 30 10:00:26 UTC 2019
Those descriptions look good
On Wed, Jan 30, 2019 at 5:58 PM Eugene Podshivalov <yaugenka at gmail.com>
> 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
> 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.
> 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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