“Simply speaking, the spillway is a massive drain for the reservoir. It prevents water from rising above a certain level and spilling over the dam or lake shoreline. The bellmouth at the Monticello Dam is the largest in the world at a diameter of 87 feet narrowing to 27 feet and can drain off 367,500 US Gallons per second.”
(via InfraNet Lab » Blog Archive » Inverted Infrastructural Monuments, pt.2)
