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<div class="moz-cite-prefix">It appears in the descriptions that a
'ditch' can be used as a 'drain'. So why have a tag 'drain'? <br>
<br>
The only differences I have between canal and the other things is
large verse small and usefull quantity. <br>
Rather subjective, not a objective measurement. If the differences
as so arbitrary why distinguish between them at all? <br>
<br>
On 01/02/19 09:45, Sergio Manzi wrote:<br>
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<p>Yes, great descriptions!</p>
<p>My only marginal objection is for canal: why don't you ditch
(pun intended...) the "<i>used to carry useful water for
transportation, hydro-power generation, </i><i>irrigation or
land drainage purposes</i>" clause?</p>
<p>Are there any other "<i>Large man-made open flow (free flow vs
pipe flow) waterways</i>" that should <b>not </b>be
considered canals?</p>
<p>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".</p>
<p>Also isn't "land drainage" potentially in contradiction with
"useful water"?<br>
</p>
<p>Cheers,</p>
<p>Sergio</p>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">On 2019-01-31 23:34, Eugene
Podshivalov wrote:<br>
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<div dir="ltr">Hi Markus,
<div>I find your amendments great.</div>
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<div>Cheers,</div>
<div>Eugene</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">чт, 31 янв. 2019 г. в
20:29, Markus <<a
href="mailto:selfishseahorse@gmail.com" target="_blank"
moz-do-not-send="true">selfishseahorse@gmail.com</a>>:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Hi Eugene<br>
<br>
Thanks for your summary! [^1] I'm in favour of the
proposed<br>
definitions and would welcome if the clarifications
regarding size you<br>
made here [^2] were included in the definitions, like for
example<br>
(*additions*, ~~deletions~~):<br>
<br>
canal - Large man-made open flow (free flow vs pipe flow)
waterways<br>
used to carry useful water for transportation, hydro-power
generation,<br>
irrigation or land drainage purposes. Consider using
waterway=ditch<br>
for small*er* ~~irrigation or land drainage~~ channels
*that directly<br>
distribute water to or collect it form the land*. Consider
using<br>
waterway=drain for small usually lined superflous liquid
drainage<br>
channels.<br>
<br>
ditch - Small artificial free flow waterways *used to
directly<br>
distribute water to dry land (for irrigation) or collect
water from<br>
wet land (for drainage)* ~~used for irrigating dry land or
draining<br>
wet land~~. Irrigation ditches can be lined or unlined,
drainage<br>
ditches are usually unlined to let water soak through the
land into<br>
them. Ditches may have short lined segments at waterway
turning points<br>
or intersections with roads or paths to prevent erosion.
Consider<br>
using waterway=canal for large*r* ~~irrigation or land
drainage~~<br>
channels *that convey water from or to ditches*. Consider
using<br>
waterway=drain for usually lined superflous liquid
drainage channels.<br>
<br>
[^1]: <<a
href="https://lists.openstreetmap.org/pipermail/tagging/2019-January/042543.html"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://lists.openstreetmap.org/pipermail/tagging/2019-January/042543.html</a>><br>
[^2]: <<a
href="https://lists.openstreetmap.org/pipermail/tagging/2019-January/042551.html"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://lists.openstreetmap.org/pipermail/tagging/2019-January/042551.html</a>><br>
<br>
Regards<br>
<br>
Markus<br>
<br>
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