[Tagging] Drain vs ditch

[Warin]

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.

On 30/01/19 19:56, Eugene Podshivalov 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 
> <mailto: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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