Originally Posted by crossfireoops
Just added a pic / drawing to a post above, sorry I didn't put it there first go round,....I THINK that what we're seeing in that hole immediately below that spill wall IS the actual core structure of the "impervious wall".
The minimalist philosophy that defines the engineering of "Earth Filled Dams" DICTATES that that core structure has to have massive weight (overburden) bearing on it from above,.....
....washing it all away is not a very bright idea, and one has to ask, WTF else did they EXPECT that overburden to do ?

GTC


Crossfire, neither spillway is on the earthfill dam.

Originally Posted by jorgeI
...Actually Sycamore, you are sort of right....