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mr_cellophane

mr_cellophane

Legendary Member
Location
Essex
benb said:
Where do they go?
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To your tap !
 
dan_bo

dan_bo

How much does it cost to Oldham?
Location
Not fkin Failsworth or fkin Blackpool either
Globalti said:
What would happen if you went down one of those holes? Would you just do a 90 degree bend and pop out of the spillway? I can't imagine there are any grilles down there because they would get blocked by floating debris that went down.

Edit: found this pdf, which has diagrams of various spillways: http://www.sasta.co....ral%20Earth.pdf
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Now THATs interesting. Explains why the dam walls at dovestones are shaped as they are.
 
fossyant

fossyant

Ride It Like You Stole It!
Location
South Manchester
The ones on Ladybower are cool, but I've never seen them in action - they are usually 10 feet out of the water - were last time we did a CC ride round there............

It's the sudden 'sink' holes that open up that are scary.......

There was one in Didsbury Centre a couple of years ago - opened up just after a bus went over it..... there is video on the web.

One local house had a big crater open up on their driveway - caused by a 'stream' which no-one knew was there.........
 
Rob3rt

Rob3rt

Man or Moose!
Location
Manchester
I mentioned these a few times in the chat room, they are very creepy, but they make me very curious to see them in real life.

I am planning to visit many of the local reservoirs (on my bike of course) to look at the spillways and "plug holes". Woodhead reservoir was the 1st and only I have visited thus far (well bar audenshaw and a couple of others on the way to Woodhead), it has a spillway that looks like a big water slide down the side of it, not as interesting as these plug holes. I am looking forward to going to Ladybower though!
 
OP
OP
Globalti

Globalti

Legendary Member
Sink holes open occasionally under Paris as the whole city is built on top of the mines, from which all the stone was taken for the Haussman boulevards. The rock is limestone so water is not involved but in places you get bell chamber formations where the roof collapses progressively until it reaches the surface and a couple of houses fall in.

Have a look at this website if you want to see some amazing photos of underground structures: http://www.28dayslater.co.uk/forums/forumdisplay.php?f=29
 
Rob3rt

Rob3rt

Man or Moose!
Location
Manchester
Globalti said:
Sink holes open occasionally under Paris as the whole city is built on top of the mines, from which all the stone was taken for the Haussman boulevards. The rock is limestone so water is not involved but in places you get bell chamber formations where the roof collapses progressively until it reaches the surface and a couple of houses fall in.

Have a look at this website if you want to see some amazing photos of underground structures: http://www.28dayslat...isplay.php?f=29
Click to expand...

Thats a very interesting site, one of my collegues good friends is a heavy contributer to that forum. My colleague has been along a few times on the expeditions, to storm drains etc.

On that website, search for Hartlepool Magna works, its an awesome looking place in the town I grew up in.
 
Arch

Arch

Married to Night Train
Location
Salford, UK
I noticed a sign on Stonegate yesterday, outside a shop, that said "Weak basement below - lorries do not mount pavement!".

Being a narrow shopping street, delivery vans often get stuck behind each other, and I imagine a fair few bump up to the pavement to get by. Some weeks back I noticed another sign out, warning van drivers of an overhanging first floor...
 
ColinJ

ColinJ

Puzzle game procrastinator!
Location
Todmorden - Yorks/Lancs border
Globalti said:
Here are some pics taken by somebody who abbed into a bell mouth spillway:http://tastelessphot...ay-exploration/
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The photographer is standing in the lower reaches of the spillway when he hears a strange, distant roaring. He blinks, his mind unwilling to accept the enormity of that sound, but inevitably the meaning of it seeps into his consciousness and his bowels spasm as he recognises it as the ghastly sound of... gushing water! :eek:
 
OP
OP
Globalti

Globalti

Legendary Member
This is a photo of an old photo I took inside the pen surrounding the surge tunnel at the Dinorwic pumped storage scheme in Llanberis. This is where excess electricity from the grid is used to pump water up into a holding reservoir up the mountain; the turbine hall contains several huge turbines, which are kept spinning in readiness and then when everybody puts the kettle on water is admitted, spinning the turbines up in a couple of seconds to meet the sudden surge in demand. When demand drops and the valves are closed there's a massive tonnage of water charging down the tunnel so it has to be given somewhere to go otherwise water hammer would be significant. A group of us on a rainy no-climbing day *ahem* climbed the security fence for a look down the tunnel; it's quite impressive, the water level falls and rises silently by huge amounts in a few seconds, apparently randomly.

The rest of the days was spent "bouldering" in the slate quarries which are equally impressive; at the bottoms of these massive holes in the Earth's surface you can actually hear the turbines humming right through the rock even though they are hundreds of feet below you.

Llanberis4.jpg
 
upsidedown

upsidedown

Waiting for the great leap forward
Location
The middle bit
When I used to kayak I read somewhere about rivers that go underground into caves, then drop into the earth, some of them for many miles. Gave me a few sleepless nights at the time.
 
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