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

Peter Elderson pelderson at gmail.com
Tue Jun 4 15:09:20 UTC 2019

Apparently I was not clear enough. There is no main usage, except keeping
water levels in all parts of the polders within very narrow range. All else
varies according to varying needs, wishes and opportunities. If it rains a
lot, the whole system drains. If it doesn't rain at all, the whole system
irrigates. If it rains exactly the amount that evaporates and leaks, the
system just holds water. In the meantime you can use the bigger ditches and
canals for human things like boating, fishing and small transport.

Vr gr Peter Elderson

Op di 4 jun. 2019 om 16:36 schreef François Lacombe <
fl.infosreseaux at gmail.com>:

> Le mar. 4 juin 2019 à 14:07, Peter Elderson <pelderson at gmail.com> a
> écrit :
>> All the waterways can drain, transport water/people/goods, and irrigate,
>> as needed.
> Transportation is not transmission. Transportation of water over a canal
> means loading water into boats and send them over the canal.
> Those canals aren't intended to transmit water like the Los Angeles
> Aqueduct does.
> Many headrace or transportation canals can also serve a water discharge
> where local drains end.
> Drainage can't be the first usage because if drainage water stops,
> transportation, navigation and irrigation should still be possible.
> Then, the two main usages can be irrigation and transportation according
> to your explanations
> Am I wrong?
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