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Saturday, April 28, 2012

Monticello Dam-California,USA


   Monticello Dam

Monticello Dam is a dam in Napa County, California, United States constructed between 1953 and 1957. It is a medium concrete-arch dam with a structural height of 304 ft (93 m) and a crest length of 1,023 ft (312 m). It contains 326,000 cubic yards (249,000 m³) of concrete. The dam impounded Putah Creek to cover the former town of Monticello and flood Berryessa Valley to create Lake Berryessa, then the second-largest man-made lake in California. The capacity of the reservoir is 1,602,000 acre·ft (1.976×109 m3). Water from the reservoir primarily supplies agriculture in surrounding areas. The dam is noted for its classic, uncontrolled morning-glory type spillway.
 The diameter at the lip is 72 ft (22 m). Locally, the spillway is also known as 'The Glory Hole'.
The Monticello Dam Powerplant was built at the dam in 1983 and 
has three generators. The electrical power is sent mostly to the North 
Bay area of San Francisco.

Located in northern California, the Monticello Dam’s is the largest morning glory spillway all over the world. This funnel-shaped outlet, allows water to bypass the dam when it reaches capacity, as it swallows a rate of 48,400 cubic feet per second (1370 m³/s).

The distance from the funnel to the exit point - which is situated in the south side of the canyon - is about 700 feet.


© 2006 Jeff Carlson, used with permission
This type of spillway is basically a giant cement funnel. The hole's largest diameter is 72 feet and narrows to about 28 feet.





According to Davis Wiki, "for obvious reasons, swimming near the glory hole is both prohibited and stupid. There are buoys strung across the lake to discourage boaters and swimmers from approaching the glory hole and the dam. Furthermore, the glory hole is well fenced off from the land.".

"During the drier months, when Lake Berryessa's water level is well below the rim of the glory hole, skateboarders and bikers sometimes use the spillway's horizontal exit as a half-pipe”.

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