On Sun, 24 Jul 2011 13:11:02 +0100, Amanda wrote:

I think it's bit like an external window sill, if it doesn't have a
groove underneath the same thing can happen, ...
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The problem is you can't do anything like that with rubber. It needs to
have a vertical end rather than horizontal.

Well loop the waterfall liner back up around something so it forms an
edge for the water that flows around the end and back along the
horizontal underside can drip from.

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Cheers
Dave.