Anyone else seen this article in the guardian?
UK water firms admit using divining rods to find leaks and pipes
www.theguardian.com/business/2017/nov/21/uk-water-firms-admit-using-divining-rods-to-find-leaks-and-pipes?CMP=Share_AndroidApp_Copy_to_clipboard
I have done, and can do water dowsing.
It's a very science based article. But amusingly all the water companies do still use it!