Hi Peter, I remembered this ...

Published by

Hi Peter, I remembered this recent publication in WWT although article first published in June.

http://socsi.in/1qzVr

Thought this might give an idea on where innovation is takeoff leak detection. Conventialy the best way is to use a combination off methods specific to pipe material, size and complexity of the network, not forgetting the social geography above ground. Hopes this helps.