There is the Glory Hole.
"The Monticello Dam, which holds back Lake Berryessa, features a morning glory spillway. This type of spillway is basically a giant cement funnel. Rather than spilling over the dam, high waters spill into the funnel. Morning glory spillways are also known as bell-mouth spillways.
When and if the water level of the lake rises to 15 1/2 feet over the top of the Glory hole (its maximum design), it will release 48,400 cubic feet per second, or in layman’s terms 362,000 gallons every 1 second."
"The Monticello Dam, which holds back Lake Berryessa, features a morning glory spillway. This type of spillway is basically a giant cement funnel. Rather than spilling over the dam, high waters spill into the funnel. Morning glory spillways are also known as bell-mouth spillways.
When and if the water level of the lake rises to 15 1/2 feet over the top of the Glory hole (its maximum design), it will release 48,400 cubic feet per second, or in layman’s terms 362,000 gallons every 1 second."
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