Tim+ wrote:
Why not syphons? 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.

Is there a size of pipe above which a syphon won't work because the
water empties out of the down pipe without 'sucking' the water above
down? It works well with small pipe because, I assume, surface
tension helps to prevent the water from 'dropping out'.

--
Chris Green
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