Finally Convinced Momma to "Swim"
Breaking the Berm to Install Overflow Pipe (No, I don't know why they did it in this order)
Tying in New and Old Overflow Pipes
(We ended up having to dig up and replace all of the 8" clay pipe and replace with 8" SDR35 because the clay pipe had hills and troughs, some kind of blockage, and tapered to 6" plastic pipe at the outlet)