On 31 May 2009, at 19:05, Allan Cazaly wrote:
> I may be completely up the wrong tree but I think that side ponds
> are supposed to be there, so that only one half of a lock full of
> water is used at a time.
Sorry Allan, your first statement is correct. The operation of the
side ponds in Foxton is completely different to those alongside a non-
staircase lock. All the lockage water flows through them, and it is
essential to start the lower chamber filling from the pond before the
upper chamber starts emptying into it, hence 'red before white'.
Brian: the ponds are no longer deep enough to hold much of the input
from the lock above, so a lot of water would be wasted by overflow or
into the museum. Repeat this several times and there will shortly not
be enough water in the system to fill a lock enough to get over the
cill.
You possibly never had this explained to you by Mick in words of one
syllable, not many of them reproducible here. I have, and I still
wake whimpering in the night when I recall the occasion ;-{{
All the best
Bruce
"The superior man knows what is right, the inferior man knows what
will sell" Analects of Confucius, circa 500 BCE
[Non-text portions of this message have been removed]
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