2000 mm twin wall pipe

[johnb5555]

Looking for roughly 3 metres of 2000 mm, or close, twin wall pipe to support a bank that's being washed away by a stream.
Or is 2000 mm not enough to take the flash rainstorms we seem to be getting more of.
Anyone have an idea of prices or other possible options.

 

[C.J]

2000mm is 6 foot ,7 inches .

 

[jondear]

I know someone who has just bought a couple to make a crossing in river they are concrete and about that size trouble is they weigh 7tonnes each!.twin wall plastic would be pricey I expect.

 

[Pheasant Surprise]

http://www.cotterillcivils.co.uk/products/land-drainage/large-diameter-twinwall/products.aspx

 

[johnb5555]

2000mm is 6 foot ,7 inches .

Stream further up goes through a 1 metre pipe and is always backing up, so was looking little larger.
Cotterills quoted nearly £500 a metre.
Plan B.

 

[KennyO]

Stream further up goes through a 1 metre pipe and is always backing up, so was looking little larger.
Cotterills quoted nearly £500 a metre.
Plan B.

Bear in mind that If you double a pipes diameter you will increase it volume by 4 approx.

 

[neilo]

Stream further up goes through a 1 metre pipe and is always backing up, so was looking little larger.
Cotterills quoted nearly £500 a metre.
Plan B.

Unless you increase the size of that 1m pipe, surely you won't be getting any more water downstream to fill a bigger one.

 

[Deereone]

Unless you increase the size of that 1m pipe, surely you won't be getting any more water downstream to fill a bigger one.

If the 1 metre pipe is backed up Then the head pressure will increase the flow rate.

 

[B&B Pig Man]

If the 1 metre pipe is backed up Then the head pressure will increase the flow rate.

Really?!

Pressure and flow (quantity) are two very different things.

 

[roscoe erf]

just put 2 or more pipes in

 

[Pheasant Surprise]

Really?!

Pressure and flow (quantity) are two very different things.

They are but they are related as in Bernoulli's Principle

 

[C.J]

Really?!

Pressure and flow (quantity) are two very different things.

This bottle has 3 holes of the same diameter.

The bottom leak travels further horizontally because the jet is moving faster due to increased head(pressure)

Therefore in the case of the pipe with increased head, the water will be travelling faster through the pipe = greater flow/second.

 

[B&B Pig Man]

This bottle has 3 holes of the same diameter.

The bottom leak travels further horizontally because the jet is moving faster due to increased head(pressure)

Therefore in the case of the pipe with increased head, the water will be travelling faster through the pipe = greater flow/second.

Faster - yes.
But same volume - if the first pipe is 1m, there is no advantage in having a bigger pipe further down.

 

[C.J]

Same volume in less time = greater flow.

 

[TWF]

http://www.assetint.co.uk/?page_id=1776

 

[Bloders]

Looking for roughly 3 metres of 2000 mm, or close, twin wall pipe to support a bank that's being washed away by a stream.
Or is 2000 mm not enough to take the flash rainstorms we seem to be getting more of.
Anyone have an idea of prices or other possible options.

Place near Shrewsbury sells second grade concrete pipe.
We've had a lot from there
I'll get details if your interested

 

[Bloders]

Faster - yes.
But same volume - if the first pipe is 1m, there is no advantage in having a bigger pipe further down.

Yes there is.
I can guarantee a pipe of same diameter further down would also back up.
I say this because, 1 in most places, further down there will be extra water, even if its only surface water to handle, and there may be other small inlets.
2. If it backs up at the first pipe, as said before, this will increase the pressure and thus increase the flow rate thru the pipe. At the second pipe, it will need to back up to increase the head of pressure to get the flow through it.

Last point, if you know the first pipe is not really of sufficient diameter, is it really worth putting a known problem in lower down? Really?

Do it proper, do it once.

 

[suffolksmallholder]

Re the link TWF has put up, if it was me looking to do this I'd go for this type. I like bridges. I like the aesthetics too.
SS

 

[neilo]

Yes there is.
I can guarantee a pipe of same diameter further down would also back up.
I say this because, 1 in most places, further down there will be extra water, even if its only surface water to handle, and there may be other small inlets.
2. If it backs up at the first pipe, as said before, this will increase the pressure and thus increase the flow rate thru the pipe. At the second pipe, it will need to back up to increase the head of pressure to get the flow through it.

Last point, if you know the first pipe is not really of sufficient diameter, is it really worth putting a known problem in lower down? Really?

Do it proper, do it once.

Definitely worth going bigger, the upstream restriction might not be there in a year or two as much as anything. I would just question the need/expense of going to 4x the size.

 

[Big Al]

I know someone who has just bought a couple to make a crossing in river they are concrete and about that size trouble is they weigh 7tonnes each!.twin wall plastic would be pricey I expect.

We have got some similar sized concrete pipes as a river crossing.
The trouble is they speed up the flow of water down the river and now we have problems with erosion at the end of the pipe. I think if you pipe the river you will just move the problem further downstream.
Could you use something else to stabilize the bank that will increase friction and slow the flow of water. I think waste Xmas trees are used for this purpose.