<br />
<br />
<br />GLOSSARY OF TE~1S
<br />
<br />
<br />Oeck
<br />
<br />Surface of roadway or top of railroad ties at center of
<br />
<br />bridge.
<br />
<br />Flood
<br />
<br />An overflow on lands
<br />that are used or usable by man.
<br />istics: The inundation of land is
<br />to and Inundated by overflow from
<br />
<br />not normally covered by water and
<br />
<br />
<br />Floods have two essential character-
<br />
<br />
<br />temporary; and the land Is adjacent
<br />
<br />
<br />a river or stream or an ocean, lake
<br />
<br />or other body of standing water,
<br />Normally a flood is considered as any temporary rise in
<br />stream flow or stage, but not the ponding of surface water, that
<br />results In significant adverse effects in the vicinity. Adverse
<br />effects may include damages from overflow of land areas, temporary
<br />backwater effects in sewers and local drainage channels, creation
<br />of unsanitary conditions or other unfavorable situations by deposi-
<br />tion of materials in stream channels during flood recessions, use
<br />of groung water coincident with Increased stream flow, and other
<br />problems.
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<br />Flood Crest
<br />
<br />The maximum stage or elevation reached by the waters of
<br />a flood at a given location.
<br />
<br />Flood Plain
<br />
<br />The relatively flat area or low lands adjoining the
<br />
<br />
<br />channel of a river, stream or water course or ocean, lake or other
<br />
<br />body of standing water, which has been or may be covered by flood
<br />
<br />
<br />water.
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<br />17
<br />
<br />Flood Prof i Ie
<br />A graph showing the relationship of water surface
<br />elevation to location, the latter generally expressed as distance
<br />above mouth for a stream of water flowing in an open channel. It
<br />Is generally drawn to show surface elevation for the crest of a
<br />specific flood, but may be prepared for conditions at a given time
<br />or stage.
<br />
<br />Flood Stage
<br />
<br />The stage or elevation at which overflow of the natural
<br />banks of a stream or body of water begins in the reach or area in
<br />which the elevation is measured.
<br />
<br />Head Loss
<br />
<br />The effect of obstructions, such as narrow bridge open-
<br />Ings or bui Idings that limit the area through which water must flow,
<br />raising the surface of the water upstream from the obstruction.
<br />
<br />Intermediate Regional Flood
<br />A flood having a one percent probabi lity of occurrence
<br />in any year of an average frequency of occurrence In the order of
<br />once in 100 years. The flood may occur in any year. It is based
<br />on statistical analysis of stream flow records and analyses of
<br />rainfal I and runoff characteristics In the general region of the
<br />watershed .
<br />
<br />Left Bank
<br />
<br />The bank on the left side of a river, stream or water
<br />course, looking downstream.
<br />
<br />Right Bank
<br />
<br />The bank on the right side of a river, stream or water
<br />course, looking downstream.
<br />
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