On Fri, 8 Apr 2005 15:16:12 +0100, Holly in France
wrote:

In an old house we once renovated there was a set up to cause rats to fall
into a barrel of water, took us some time to find out what it was!

I wouldn't recommend it.

I once had a rat-drowning tank in an attic (not deliberate). As it
took seemingly _days_ to drown a rat (you could hear squeaking) it was
easier to give them a ramp to climb out on.