The large spillway tunnels have only been used twice, for testing in 1941 and because of flooding in 1983.
In addition to testing in 1941, the spillways were used because of flooding in 1983. The large spillway tunnels have only been used twice.
The large spillway tunnels have only been used twice. In addition to testing in 1941, the spillways were used because of flooding in 1983.
The large spillway tunnels have only been used twice. In addition to testing in 1941, the spillways were used because of flooding in 1983.