The next time the water is flowing trough the pipe, chek the areas between the dam and the out flow of the pipe for any abnomally wet or soft, spongy areas too.
If this thing has sunk nearly as much as you think, the dam will have to be washing out from the inside and would be catastrophic if it failed all at once rather than being topped and eroding away quickly.
How tall was the dam? Your average depth and acerage again??
Last edited by Rainman; 10/09/08 10:27 PM.
