Bellmouth spillway © giles bertenshaw
What can be described as a giant hole in the water is actually a method for controlling the release of flows from a dam or levee into a downstream area. These spillways help prevent floods from ‘dam’-aging or destroying a dam. The most eye-catching spillway is the bell-mouth, shaped like an inverted bell, which is particularly noted for its resemblance to a giant plughole.
Photo by Jon Bradbury
Photo by David Wilby
Photo by Buster Bakewell
Photo by Tone
Photo by Preseverando
Photo by Martin Roberts
The images below are from the The Monticello Dam in Napa County, California. The dam is noted for its classic, uncontrolled morning-glory type spillway. (PhotoS by the U.S. Bureau of Reclamation)
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interesting series!