"Stephen" wrote in message
...
On Wed, 2 Sep 2009 22:55:10 +0100, "Calvin Sambrook"
wrote:

That's almost certainly true but remember that this type of diverter isn't
very good at collecting 100% of the rainfall anyway and the percentage
collected drops as the rainfall rate increases because it's only
collecting
from the wall of the downpipe

Is there a better type that collects nearer to 100% of the rainfall?

My down pipe goes into the water butt and the overflow from the butt into
the drain.