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Date: | Mon, 13 Feb 2006 10:54:44 -0500 |
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In a message dated 2/13/2006 7:13:43 A.M. Pacific Standard Time,
[log in to unmask] writes:
http://www.ccrginc.com/#news
Sean,
Various federal agencies erect mounds of natural rock to reduce the velocity
of downstream water and control otherwise raging rivers. I have never heard
the term "rock rollers," but have seen similar constructions built by the
U.S. Forest Service, U.S. Army Corps of Engineers, California Division of
Highways, and local agencies for diverting water, capturing sediments, create
ponding, and just plain reducing speed to control the flow. I suggest you contact
the Army Corps of Engineers for their terminology and explanation of when and
why such a feature would need to be built.
Down here in San Diego County, enormous volumes of water run down from the
mountains to inundate low desert communities. I have seen the County of San
Diego, Department of Public Works build long piles of rocks at various angles to
break the speed of the flow and redirect it away from towns, ranches, and
other improvements. The California Department of Fish and Game also installed
rock mounds to impound water as habitat for fish and other aquatic species on
some drainages. A period when a lot of that kind of construction occurred was
during the Depression when work crews came cheap. They also built "water
guzzlers" or sheets of concrete that drained into shaft-like cisterns for
animals to get water (to improve nature's way of feeding the animals).
Ron May
Legacy 106, Inc.
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