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<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 />