There’s plenty of evidence that water divining is an effective method of finding flowing water. And the evidence is not “anecdotal” as some would like to describe it. The evidence is that many people throughout history have used it effectively, and continue to do so today. Otherwise why would they continue to use it?
Where is the evidence it does not work? The only double-blind testing I have seen (eg on Youtube) is invalid because the tests were done with static water, not flowing.