First live aboard problem!

[Punkstig]

[quote author=BBROWN1664 link=topic=13681.msg154390#msg154390 date=1403040865]
I thought the idea of leaving the lower gate open was to ensure any seepage from the top gate stopped the lock filling up and potentially overflowing.

It is impossible for a lock to overflow as once the water builds up to the same level as the water entering it, the water stops flowing.
[/quote]

Although the lock won't overflow the top sides of the lock the upper cut water can at times be higher than the top of the lower lock gate, the lock would potentially fill up then overflow the top of the lower gate,
Which although not the end of the world it's something british waterways don't want happening as it's excessive pressure and wear on the system!