Thanks all, for your informative replies.
I wont tell her Im right, just, Im not wrong.
Our water pipes are blue plasticky hose and its sometimes above ground, as it doesnt freeze here.
So one has to watch out for hoons, drunks and louts trashing it.
Also, our crappy city council patches one bit then the next bit blows under the road next to it, so one can always see the new big plasticky pipes going in,as the roads rip up in sequence.
I think the council workers enjoy working in my area.....