On 04/08/2019 23:30, The Natural Philosopher wrote:
On 04/08/2019 20:16, Steve Walker wrote:
On 04/08/2019 20:04, Tim+ wrote:
Why not syphons?Â* I mean, pumps use power, quite a lot of it and are
relatively expensive. For a syphon, you just need a suitably sized
bit of
pipe.

Pumps can also move a lot more water per unit time than a siphon.

I'd hate to have to suck on the end to get it started

Seriously. Yes, I would have thought siphoning from behind the dam,
over the top and down to the bottom would make sense. Even if it
wasn't as effective as pumping, it could surely supplement it.

SteveW

you can't siphon up more than 32ft

And you would need a pipe on the up side to the top that can stand
having 1 atm of pressure trying to crush it. It could work though to get
the level down to 10m below the level of the spillway.

A pump always ensures positive pressure inside the pipe keeping it open.

--
Regards,
Martin Brown