[Tagging] Irrigation: ditches, canals and drains

[Mateusz Konieczny]

For me all of the look equally fine.


29 May 2019, 15:24 by joseph.eisenberg at gmail.com:

> Which of the ways of tagging "irrigation" should be used?
>
> "irrigation=yes" works ok, but it hasn't been very popular the last few years
> "service=irrigation" is still most common, but the key is a little odd
> "usage=irrigation" makes sense and is increasing in usage
>
> See chart of usage over time:
> https://wiki.openstreetmap.org/wiki/Tag:usage%3Dirrigation#Alternative_tagging
>
> I think "usage=irrigation" may be the best option.
>
> On 5/29/19, Joseph Eisenberg <joseph.eisenberg at gmail.com> wrote:
>
>>> Not sure about small rock-cut waterways  with massive impermeable sides,
>>> are these ditches or canals or drains?
>>>
>>
>> We don't have these in the western USA, but generally our ditches are
>> dug out of the soil, so I would be surprised to see a feature tagged
>> as waterway=ditch if it were cut from bedrock or lined with stone.
>>
>> I'd think waterway=canal would be appropriate for these if they are
>> large enough.
>>
>> One tag that's already used is canal=qanat for "a gently sloping
>> underground channel or tunnel constructed to lead water from the
>> interior of a hill to a village below", found in the Middle East
>>
>> If there are small irrigation waterways that area lined with stone (or
>> concrete etc), we probably need a new tag, since waterway=drain is
>> pretty strongly associated with drainage, not irrigation, and
>> waterway=canal probably has a minimum width?
>>
>>
>> On 5/29/19, Martin Koppenhoefer <dieterdreist at gmail.com> wrote:
>>
>>>
>>>
>>> sent from a phone
>>>
>>>> On 29. May 2019, at 03:37, Joseph Eisenberg <joseph.eisenberg at gmail.com>
>>>> wrote:
>>>>
>>>> What, then, should be the distinguishing characteristic between
>>>> waterway=canal and waterway=ditch or =drain? Width or importance or
>>>> navigability, or should we still mention the usage as the main
>>>> difference?
>>>>
>>>
>>>
>>> IIRR ditches were seen without construction like steel or concrete, just
>>> a
>>> man made depression to channel water, while drains are required to have
>>> their borders (and maybe base) constructed.
>>>
>>> Not sure about small rock-cut waterways  with massive impermeable sides,
>>> are
>>> these ditches or canals or drains?
>>>
>>> Stating the usage explicitly might help interpretation of the data, or
>>> while
>>> we’re still mapping fragments of an incomplete network, although I would
>>> have guessed with a more mature mapping this could already be seen from
>>> looking at the network structure and flow directions?
>>>
>>> What about the practical, human scale distinction we use for natural
>>> waterways (can be jumped over), wouldn’t it be equally interesting for
>>> man
>>> made waterways?
>>> Is a canal you can jump over still a canal, or does size somehow come
>>> into
>>> the equation? Can there be draining canals, or are these always drains?
>>>
>>> Cheers, Martin
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>
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