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

Philip Barnes phil at trigpoint.me.uk
Tue Jun 4 14:54:40 UTC 2019

On Tuesday, 4 June 2019, François Lacombe wrote:
> 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?
Not wrong, but there are edge cases for example The Llangollen Canal for example, whilst very popular with boaters, it crosses the world heritage site  Pontcysyllte Aqueduct, is also used to carry water from The Dee to Cheshire for public water supply. Discovered this after wondering why so much water flows through the lock bypass channels.

Phil (trigpoint)
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