Hello, I almost expected that no meaningful answer would come to this. But I find it unfortunate that it is then dismissed as ridiculous. I would have expected a bit more respect here.
Hello frosch006,
the tip about the esotericism forum was certainly meant seriously. There you can also expect to get serious answers to this question. Dowsing rods and dangerous water veins are - from a scientific perspective - nonsense. And in order to work in a reputable advisory capacity, such a forum must adhere to certain standards. Serious tips without profit motives are simply not possible in this context when it comes to dangerous water veins.
Do you also want to do without running water in your house? Is a rain gutter perhaps also a kind of water vein? Or the building expert’s objection regarding underfloor heating? Today it was announced that the Nobel Prize in Physics goes to two people in neutrino research. Particles that pass through your body billions of times, and you can do nothing about it (and still live).
I can only give you the absolutely sincere tip not to make the mistake of generalizing individual cases, like with your acquaintance. The risk of misjudgment is far too great. One should always question critically, of course, but it is much more important not to be resistant to learning.
Regards Tego