It appears in the descriptions that a 'ditch' can be used as a 'drain'.
So why have a tag 'drain'?
The only differences I have between canal and the other things is large
verse small and usefull quantity.
Rather subjective, not a objective measurement. If the differences as so
arbitrary why distinguish between them at all?
On 01/02/19 09:45, Sergio Manzi wrote:
Yes, great descriptions!
My only marginal objection is for canal: why don't you ditch (pun
intended...) the "/used to carry useful water for transportation,
hydro-power generation, //irrigation or land drainage purposes/" clause?
Are there any other "/Large man-made open flow (free flow vs pipe
flow) waterways/" that should *not *be considered canals?
My concern is that somewhere in the world there could be a canal not
built for any of those purposes and somebody could object to call it
"a canal".
Also isn't "land drainage" potentially in contradiction with "useful
water"?
Cheers,
Sergio
On 2019-01-31 23:34, Eugene Podshivalov wrote:
Hi Markus,
I find your amendments great.
Cheers,
Eugene
чт, 31 янв. 2019 г. в 20:29, Markus <[email protected]
<mailto:[email protected]>>:
Hi Eugene
Thanks for your summary! [^1] I'm in favour of the proposed
definitions and would welcome if the clarifications regarding
size you
made here [^2] were included in the definitions, like for example
(*additions*, ~~deletions~~):
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*er* ~~irrigation or land drainage~~ channels *that directly
distribute water to or collect it form the land*. Consider using
waterway=drain for small usually lined superflous liquid drainage
channels.
ditch - Small artificial free flow waterways *used to directly
distribute water to dry land (for irrigation) or collect water from
wet land (for drainage)* ~~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*r* ~~irrigation or land drainage~~
channels *that convey water from or to ditches*. Consider using
waterway=drain for usually lined superflous liquid drainage channels.
[^1]:
<https://lists.openstreetmap.org/pipermail/tagging/2019-January/042543.html>
[^2]:
<https://lists.openstreetmap.org/pipermail/tagging/2019-January/042551.html>
Regards
Markus
_______________________________________________
Tagging mailing list
[email protected] <mailto:[email protected]>
https://lists.openstreetmap.org/listinfo/tagging
_______________________________________________
Tagging mailing list
[email protected]
https://lists.openstreetmap.org/listinfo/tagging
_______________________________________________
Tagging mailing list
[email protected]
https://lists.openstreetmap.org/listinfo/tagging
_______________________________________________
Tagging mailing list
[email protected]
https://lists.openstreetmap.org/listinfo/tagging
