Hi Bekic,
I already put all the info I got from them, the next step is when they will survey the dam again after the owners have remediated the leakage as they explained. I hope there will be a follow up. I suppose the hyperbolas are due to the high amount of water leaking through what I imagine would be sort of a cavity or conduit. The only thing I left out was a story about the native people cursing the dam because it was built in one of their sacred sites. Apparently they told to the dam owners that the thing would never work and that "the spirits" will make sure it will be out of operation, that is "leaking". I dind't and still don't think this is relevant information, but just a curious thing I suppose. As hard as it might seem to believe there are native people in Sweden that are not Swedes.
The water leakage that I personally have surveyed in the past look exactly as you describe, "a zone of saturated material", please look here:
viewtopic.php?f=33&t=1601I don't really know what happened there and the owner of the dam won't give more details to my customer neither, they just wanted to find where the damn thing was leaking. Apparently the results they got from my customer are in accordance to what they thought from the start since they were satisfied.
On your note about concrete, I have never heard of anything called betonit before this time so I don't think it would be boring or unnecessary for you to tell. It is always interesting to know how the damages we find can be mended, perhaps to give some ideas to the people hiring us.
My best regards,