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Birchville Dam is believed to be the second unreinforced concrete arch dam built for water supply in New Zealand.It was built in 1930 for the Upper Hutt Borough Council to provide increased water capacity for the borough and replaced a water supply weir built in 1913–1914 at the same location on Clarke's Creek, near Birchville.
About 13,000 years ago Glacial River Warren drained Glacial Lake Agassiz in a huge flow of water that produced a waterfall that progressed up the Mississippi, then up the Minnesota River. As it passed through St. Paul 13,000 years ago, the waterfall was a barely imaginable 2700 ft wide and 175 ft high. When the waterfall went past the ...
These uncontrolled spillways are also called morning glory (after the flower), or glory hole spillways. [12] [13] In areas where the surface of the reservoir may freeze, this type of spillway is normally fitted with ice-breaking arrangements to prevent the spillway from becoming ice-bound. Some bell-mouth spillways are gate-controlled.
Spillway on October 10, 2009, when the water was 32.24 feet (9.83 m) below the crest. The spillway at Monticello Dam in operation, February 19, 2017. The dam's morning-glory-type spillway , known as the Glory Hole , [ 15 ] is 72 feet (22 m) in diameter at lake level and narrows down to about 28 feet (8.5 m) at the exit.
Crystal Dam, like the higher Morrow Point Dam farther upstream, is a thin-shell arch dam, primarily planned to generate hydroelectric power. Unlike its upstream companions, excess water spills over the top of the dam through a notched-out, ungated spillway that can create a 227-foot (69 m) waterfall in times of overflow.
The dam was topped out on April 7, 1888 to a height of 90 feet (27 m) above its foundations. [12] To the south of the structure was constructed the spillway or "waste weir", consisting of eight overflow channels separated by masonry piers. Controlled by a series of wooden boards, the spillway could handle up to 1,500 cubic feet per second (42 m ...
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