True .. but if a dam breaks ... They'll be having a whole lot more troubles to worry about then just flooding
I'm no expert in this area .. but it sounds to me they reason to be concern about that
I don't believe there is any worry about the dam breaking.
This is a controlled release to my understanding at the Delaware Dam, which feeds into the Olentangy River.
There is a backup along the Olentangy north of the dam.
Go back and read Godzilla's post. The Corps constantly watches the weather and rainfall to adjust outflow to provide room for future rain events. With all the dams they manage it's a full time operation to allow for what happens downstream if they release too much water from all the dams at once.
They normally lower water levels behind dams at the end of the year to the winter pool level. That provides the storage capacity for snowmelt and spring rains to prevent or lessen flooding. Even if a record rainfall event happens, each dam has a secondary/emergency spillway to pass the flow from a standard project flood without the water overtopping the dam and destroying it.