DNicholaus, I live in lawrence county also. I'm sorry for the loss of your dam, i know that Christmas rain raised my new pond 13 feet over night. Scared me. It sure looks like a overflow pipe collar problem, especially with the smooth pipe vs. the N12 pipe(got it at CPI). Looking at the hollar you have I might size up to a 18 inch pipe. The heavy rains can bring alot of water fast.
