“What is this thing in a lake in Ohio? Drains into a big pipe at the bottom of a hill.”
A: "It’s an overflow — the most important safety feature of the reservoir. Without a designated spill point (overflow), if the reservoir overflows, it will happen in an uncontrollable way, with the potential to undermine the foundations of the dam, resulting in the collapse of the dam."
Same thought here....i realize I am old :-(