From Newsgroup: uk.rec.waterways

"The Grand Union Canal Transfer (Guct) scheme to transport water from
the Midlands to the Southeast of England will see a variety of novel
and standard civil engineering interventions along its route..."

https://www.newcivilengineer.com/latest/a-win-win-affinity-water-discusses-interventions-along-its-grand-union-canal-transfer-scheme-20-03-2026/
--
Regards,

Martin Nicholas.

E-mail: reply-202603@mgn.org.uk (Address will be valid throughout
March).

The Usenet: 46 years of social media.

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From Newsgroup: uk.rec.waterways

On 20/03/2026 18:29, Martin Nicholas wrote:

"The Grand Union Canal Transfer (Guct) scheme to transport water from
the Midlands to the Southeast of England will see a variety of novel
and standard civil engineering interventions along its route..."

https://www.newcivilengineer.com/latest/a-win-win-affinity-water-discusses-interventions-along-its-grand-union-canal-transfer-scheme-20-03-2026/

Just some random thoughts on this:

The quoted 3 m/s maximum water flow rate is clearly wrong, as that is nearly
7 mph. A more realistic 1/2 mph is 0.22 m/s.

Taking the quoted 115e6 litres/day, that's an average of 1.33 m^3/s.
Assuming a minimum cross section of 4 m wide by 1 m deep, that would give a worst case average flow rate of about 0.33 m/s = 3/4 mph. Hopefully that's
not as bad as the narrow bits on the Llangollen.

A 16" increase in the height of the banks sounds a lot, but if it's in
places where the banks are currently quite low, I guess it's not too bad.

Affinity Water was apparently formed from Colne, Rickmansworth and Lee
Valley Water companies.

I assume it should at least keep the canal in water in dry summers, assuming Severn Trent doesn't run out of water. Where is the water going to come from anyway? Is it the Elan Valley?

Roger
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From Newsgroup: uk.rec.waterways

On 20/03/2026 23:38, Roger wrote:

On 20/03/2026 18:29, Martin Nicholas wrote:

"The Grand Union Canal Transfer (Guct) scheme to transport water from
the Midlands to the Southeast of England will see a variety of novel
and standard civil engineering interventions along its route..."

https://www.newcivilengineer.com/latest/a-win-win-affinity-water-discusses-interventions-along-its-grand-union-canal-transfer-scheme-20-03-2026/

Just some random thoughts on this:

The quoted 3 m/s maximum water flow rate is clearly wrong, as that is nearly 7 mph. A more realistic 1/2 mph is 0.22 m/s.

Taking the quoted 115e6 litres/day, that's an average of 1.33 m^3/s.
Assuming a minimum cross section of 4 m wide by 1 m deep, that would give a worst case average flow rate of about 0.33 m/s = 3/4 mph. Hopefully that's not as bad as the narrow bits on the Llangollen.

It's a bummer when you miss out a decimal point. :-)

Although,if they are referring to the speed in bywashes, that often
happens already. I've had the joy of riding the bywash surf at Copper
Mill lock after a few days of heavy rain. The local canoe club use it
for white water training. :-)

They also say maximum speed, not normal flow.
--
Tciao for Now!

John.
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From Newsgroup: uk.rec.waterways

On Fri, 20 Mar 2026 23:38:56 +0000
Roger <usenet@rilynn.me.uk> wrote:

I assume it should at least keep the canal in water in dry summers,
assuming Severn Trent doesn't run out of water. Where is the water
going to come from anyway? Is it the Elan Valley?

Roger

Says the feed will come from Minworth Advanced Water Treatment Plant
(sewage farm). Looks like Southerners will get treated sewage to drink -
rather like the residents of the Chester area get Wolverhampton's.
--
Regards,

Martin Nicholas.

E-mail: reply-202603@mgn.org.uk (Address will be valid throughout
March).

The only thing necessary for the triumph of bullshit is that good folks
say nothing.

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From Newsgroup: uk.rec.waterways

On 21/03/2026 10:17, Martin Nicholas wrote:

On Fri, 20 Mar 2026 23:38:56 +0000
Roger <usenet@rilynn.me.uk> wrote:

I assume it should at least keep the canal in water in dry summers,
assuming Severn Trent doesn't run out of water. Where is the water
going to come from anyway? Is it the Elan Valley?

Roger

Says the feed will come from Minworth Advanced Water Treatment Plant
(sewage farm). Looks like Southerners will get treated sewage to drink - rather like the residents of the Chester area get Wolverhampton's.

Londoners are used to it. Every drop of water delivered in London from
the Thames has been drunk at least four times...
--
Tciao for Now!

John.
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