On Fri, 09 Jul 2010 08:55:06 +0100 (BST), "Dave Liquorice"
wrote:

I cannot see how it could be detected that an underground water system
was being used, so a ban would be unenforceable.

Apart from your lawn/veg patch being a verdent green when everything
around has turned brown...

That would be evidence (eventually), but not proof.

--
Cynic