<br />I
<br />I
<br />
<br />GLOSSARY OF TERMS
<br />
<br />Stream - Any natural channel or depression through which water flows
<br />whether continously, intermittently, or periodically, including
<br />modification of the natu~al channel or depression.
<br />
<br />I
<br />
<br />Channel - A natural or artificial water course of pe:ceptible exten~
<br />with definite banks to confine and conduct conttnuously or pertod-
<br />ically flowing 'water. Channel flow Is that water which is flowing
<br />within the limits of the defined channel.
<br />
<br />Flood - Water from a river, stream, water course, lake or other body
<br />of standing water, that temporarily overflows the boundaries within
<br />which it is ordinarily confined.
<br />
<br />Flood Crest - The maximum stage or elevation reached by the waters of
<br />a flood at a given location.
<br />
<br />Flood Frequency - A means of expressing the probability of flood occ~r-
<br />renceS as determined from a statistical analysis of representative
<br />stream flow or rainfall and runoff records. The frequency of a
<br />particular stage or discharge is usually expressed as occurring
<br />once in a specified number of years. The 10-, 25-, 50-, 100-, and
<br />500-year frequency floods have an average frequency of occurrence
<br />in the order of once in the number of years as Indicated.
<br />
<br />Structure - Anything constructed or erected, the use of which requires
<br />a more or less permanent location on or in the ground, Includes
<br />but is not limited to bridges, buildings, canals, dams, ditches,
<br />diversions, irrigation systems, pumps, pipelines, railroads, roads,
<br />sewage disposal systems, underground conduits, water supply systems,
<br />and wells.
<br />
<br />"
<br />
<br />I
<br />
<br />I
<br />
<br />I
<br />
<br />Typical Valley Cross Section - An engineering drawing of a vertical
<br />section of a stream channel and adjoining landscape as viewed in a
<br />downstream direction_ The drawing represents a specified location
<br />within a designated ,stream reach.
<br />
<br />I
<br />I
<br />
<br />Water Surface Profile - (This term is synonymous with'- Flood Profile) -
<br />a graph showing the relationship of the water surface elevation of
<br />a flood event to location along a stream or river.
<br />
<br />Watersheds - A drainage basin or area which collects runoff and trans-
<br />mits it usually by means of streams and tributaries to the outlet of the
<br />basin.
<br />
<br />I
<br />
<br />10-Year Flood - A flood having an average' frequency of occurrence
<br />of once in 10 years. It has a 10 percent chance of being
<br />equalled or exceeded in any given year.
<br />
<br />BIBLIOGRApHY
<br />
<br />I
<br />
<br />100-Year Flood - A flood having an average frequency of occurrence
<br />of once in 100 years, It has a I percent chance of being
<br />equalled or exceeded in any given year,
<br />
<br />Comprehensive Plan, Chaffee County, Colorado - Upper Arkansas Area
<br />Council of Governments - 1976
<br />
<br />I
<br />I
<br />
<br />Flood Peak - The highest stage or discharge attained during a flood
<br />event; also referred to as peak stage or peak discharge.
<br />
<br />Elevated Residential Structures - Reducing Flood Damage Through Building
<br />Design - National Flood Insurance Program, FIA, Department of Housing
<br />-nd Urban Development - 1976
<br />
<br />I
<br />
<br />Flood Plain - The relatively flat or low land area adjoining a river,
<br />stream, watercourse, lake, or other body of standing water which
<br />has been or may be covered temporarily by flood water. For admini-
<br />strative purposes the flood plain may be defined as the area that
<br />would be in~ndated by the 100-year flood.
<br />
<br />Federal Register - National Flood Insurance Program - October 26, 1976
<br />
<br />I
<br />I
<br />
<br />Perched Channel Flow - A condition where the flow elevation in the
<br />outer portions of the flood plain is higher than the flow elevation
<br />in the primary channel. This condition occurs when a higher
<br />secondary' channel receives inflow from some location upstream and
<br />maintains a flatter slope than the primary channel,
<br />
<br />Guidelines for Determining Flood Flow Frequency - Bulletin No. 17 -U. S.
<br />Water Resources Council, W-shington, D. C., March, 1976
<br />
<br />Manual for Estimating Flood Characteristics of Natural Flow Streams in
<br />Colorado - Technical Manual No. I - Colorado Water Conservation Board,
<br />1976
<br />
<br />I
<br />
<br />Reach - A hydraulic engineering term used to describe longitudinal
<br />segments of a stream or river.
<br />
<br />Manual for Local Governments, Flood Plain Management, Flood Control and
<br />Flood Disaster Programs - Colorado W-ter Conservation Board, June 1976
<br />
<br />Regulation of Flood H-zard Areas to Reduce Flood Losses, Volumes One and
<br />Two - U. S. Water Resources Council, Washington, D. C., 1971 and 1972
<br />
<br />I
<br />I
<br />
<br />Runoff - That part of precipitation, as well as any other flow con-
<br />tributions, which appears in surface streams of either perennial or
<br />intermittent form,
<br />
<br />A Perspective On Flood Plain Regulations for Flood Plain Management,
<br />EP 1165-2-304, Department of the Army, Office of the Chief of Engineers,
<br />Washington, D. C., June 1976.
<br />
<br />I
<br />
<br />C-7
<br />
<br />c-8
<br />
|