Mary Fisher wrote:

There isn't. We don't need a scientific explanation for how concrete sets or
why water doesn't run uphill, we accept it.

The reason why we accept that concrete sets without a scientific
explanation is because it can be demonstrated.

Since dowsing cannot be demonstrated, there can be no kind of
explanation, scientific or otherwise. It doesn't work.

the explanation might be
interesting ut isn't essential to the working of the system.

But it doesn't work. That's the point.