[Tagging] Irrigation: usage=irrigation vs irrigation=yes [Was Irrigation: ditches, canals and drains]

Peter Elderson pelderson at gmail.com
Tue Jun 4 12:01:10 UTC 2019


The Dutch system of "polders" uses waterways for drainage, transport and
irrigation, but not in a source2target way. Basically, a "polder" is a
bathtub wherein several waterlevels (rings) are maintained through a
network/maze of canals and ditches. When it rains a lot, water is pumped
out of the polders; in dry periods, water is moved into the polders. All
the waterways can drain, transport water/people/goods, and irrigate, as
needed.

I guess we would have mainly waterway=canal and waterway=ditch, and very
few waterway=drain where e.g. an industrial facility drains its wastewater.
usage=* does not have meaning for most of these waterways. Flow direction
vary. You do want to know if it's accessible/allowed for
rowboats/motorboats/canoes.
And maybe if you can cross them with a jumping-pole. Very important in some
areas.

Fr gr Peter Elderson


Op di 4 jun. 2019 om 12:09 schreef François Lacombe <
fl.infosreseaux at gmail.com>:

> Hi Joseph,
>
> Le mar. 4 juin 2019 à 01:55, Joseph Eisenberg <joseph.eisenberg at gmail.com>
> a écrit :
>
>> However, the key "usage=" is also used with railways, eg usage=main,
>> usage=branch. This might be considered a problem by some mappers,
>> though at least all of the values used for railways are completely
>> different than the list of values used for waterways and pipelines.
>>
>
> To me it's not an issue but someone can indeed have different opinion.
>
>
>> The other issue is that canals or ditches used for both irrigation and
>> drainage (depending on the season) would need to be tagged like
>> "usage=irrigation;drainage", and a long-distance canal that transmits
>> irrigation water might need to be tagged
>> "usage=transmission;irrigation"
>>
>
> According to semantics of canals and ditches, a canal can't be used for
> drainage and a ditch/drain shouldn't be used for irrigation
>
> Transmission should overcome any other value as it consists in leading
> water from source to consumption places for more precise purpose.
> We do have same approach with power lines or highway
> You won't tag an actual motorway highway=motorway;service;residential for
> the reason it leads to residential or service highways at its end.
>
> 2) Irrigation=yes
>>
>> With this tag, it would be possible to also use "drainage=yes", so a
>> canal used for both drainage and irrigation could be "waterway=canal"
>> + "irrigation=yes" + "drainage=yes" - this leads to using an extra
>> tag, but doesn't require any semicolon-separated values.
>>
>
> This shouldn't occur according to my comment upside.
> usage values should not intersect with each others, I think there is no
> need of yes/no values for it.
>
> Feel free to give any example where it doesn't work.
>
> All the best
>
> François
>
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