Fascinating. It would be interesting to see if another dowser would identify the same lines (without having any prior knowledge of this web site).

Actually, I wonder if that would be a sufficient criterion to win Randi's prize: Two dowsers independently dowse the same area chosen at random by Randi's team. The degree of correlation between their results could be assessed mathematically without the need for the method to be scientifically understood. If the correlation was statistically significant beyond pure chance then Randi would have to accept either that dowsing works or that telepathy works. Either is sufficient to claim the prize.