On 29 Jan 2006 06:39:03 -0800, Tudor Hughes wrote:

A national water grid would be ideal, but would cost a lot and would
need energy to shift large amounts of water around the country. I'm not
enough of a hydraulic engineer to say exactly how much. It all depends
on pipe diameter, roughness, slope (if any) and flow rate.

Ah but you don't ship potable water about the country. You "simply" use
the canals and rivers.

Just think there are two big (24"?) pipes from Welsh Wales to Birmingham
and the Grand Union from Birmingham to London. The flow from Wales to
Birmingham is gravity. I expect that there is at least one lift required
on the Grand Union but generally I think it's down hill from Birmingham
to London (ISTR that Brum is at 300' ish, London is sealevel).
You get the idea...

--
Cheers
Dave. pam is missing e-mail