FLOOD04722

• County: Las Animas
• Basin: Arkansas
• Title: Storm and Flood of July2-3, 1981 Frijole Creek Basin
• Date: 9/1/1982
• Prepared For: Colorado and Southern Railway
• Prepared By: Bishop Associates, Inc.
• Floodplain - Doc Type: Flood Documentation Report

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SECTION IX

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GLOSSARY

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Backwater Effect. The rise in surface elevation of flowing water upstream
from and as a result of an obstruction to flow.

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Flash Flood. A sudden, destructive flood occurring over a short
period of time, usually in a small drainage basin. In the interior
western United States, flash floods are generally the result of intense
summer convectional storms.

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Flood. An overflow of water onto lands not normally covered by water.
In common usage, a flood is an event where a stream overflows its
normal banks, or any temporary rise in streamflow which results in
significant adverse effects in the vicinity. In frequency analysis,
it means a flow rate of a specified recurrence interval and may not
imply overflow from the banks.

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Flood Peak. The maximum instantaneous discharge of a flood at a
given location. It usually occurs at or near the time of the flood
crest, the maximum stage or elevation reached by the flood flow.

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Flood Plain. The relatively flat area or lowlands adjoining a river,
stream, watercourse, ocean, or lake, which have been or may be covered
by flood water.

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Flood Stage. The elevation at which overflow of the natural banks
of a stream or body of water begins in the reach or area in which the
elevation is measured.

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Floodway. The channel of the stream and that portion of the flood
plain which is used to carry flood flows.

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Intermediate Regional Flood. A term used by the Corps of Engineers to
designate a flood having an average frequency of occurrence on the order
of once in 100 years although it has a statistical one percent chance
of being equalled or exceeded during anyone year.

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Isohyet. A line on a map showing points of equal rainfall amounts.

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NOAA. National Oceanic and Atmospheric Administration.

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Overland Flow. Broad, shallow flow which is not contained in a well-
defined channel, varying in depth from less than an inch to two feet.

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