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Last modified
11/23/2009 1:37:35 PM
Creation date
10/4/2006 9:36:20 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
69
County
Gunnison
Community
Gunnison
Stream Name
Gunnison River,Tomichi Creek
Title
Floodplain Information Report - Gunnison River/Tomichi Creek, Gunnison, CO
Date
12/1/1976
Designation Date
7/1/1977
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />Drainage Basin <br /> <br />flood <br /> <br />"I']"od, lon_v,,~~ <br /> <br />Flood Frequ"ncy <br /> <br />FloodP"...k <br /> <br />Apart of the aurface of the earth that isoccupi..d <br />by a drainage system, which consists of a surface <br />~tream or a body of impounded surface water together <br />with all tributary surface streams and bodies of im- <br />pounded sutface water. <br /> <br />Floodplain <br /> <br />An overflow on lands not normally covered by water and <br />that are used or usable by man. Floods have twO essen- <br />tia1 characteristics; the inundation of land is temporary; <br />and the land is adjacent to and inundated by overflow <br />from a river or stream or an ocean, lake or other body <br />of standing water. <br /> <br />Normally, a flood is considered as any temporary rise <br />in streamflow or stage, but not the ponding of surface <br />water, that results in significant adverse effects in <br />thcvicinity, Adverse effects may included_ages <br />from overflow of land areas, temporary backwater effects <br />in sewers and local drainage channels, creation of <br />unsanitary conditions or other unf~vorahle situations <br />by deposition of mat~ri~ls in stream chan~els during <br />flood recessions, uSe of ground water coincident with <br />increa~ed streamflow and othcr problems. <br /> <br />FloodProflle <br /> <br />Flood Stage <br /> <br />Left Bank <br /> <br />Log-Pearson Type <br />III Distribution <br /> <br />~ typP ~f flo~d, in~lu~lng the water surface elevation <br />and tertitorialoccupation ther"of,whichcanbeex_ <br />pected to occur at any time in a g1ven area based upon <br />recorded hl~t"dc"l precipitation and other vaUd data, <br />but with an average statistical on~ percent chance of <br />being equalted or exceeded during any one ycar. Th'" <br />term is used interchangeably with a one perccnt flood or <br />Intermediate Regional Flood. <br /> <br />(See Probability) The average recurrence interval <br />of specific discharges or water stages which cause <br />flooding. <br /> <br />Low Hazard Zones <br /> <br />Meander <br /> <br />Peak Dischar~e <br /> <br />Precipitation <br /> <br />The maxillmm instantaneous discharge of " flood at a <br />given location. Itusuallyoccursatorne.artherim<, <br />of the flood crest. <br /> <br />'" <br /> <br />An area in and adjacent toa stream, whkh area ia <br />subject to flooding as the result of the occurrence <br />of a IOo-year flOod and which area thus is So adverse <br />to past, current, or foreseeable construction or land <br />use as to constitute a significant ha7.ard to public <br />health and safety or to property. <br /> <br />A graph sho"lng the rehtiol1ship of water surf'lce <br />elevation to location, the latter generally exprc~sed <br />as distancc above mouth for a stream of water flowing <br />in an open channcl. It is generally drawn to show <br />surface elevation for the crest of a specific flood, <br />but may be prepared for conditions at a given time or <br />stage. <br />The stage or elevation at which ove~flow of the natural <br />banks of a stream or body of watcr begins in the reach <br />or area in which the elevation is measured, <br /> <br />The bank on thc left side of a river, stream or water <br />course as thc observer looks downstream. <br /> <br />A statlstical distribution used in flood frequency <br />analysis, which la described by three parameters; <br />mean, standard devia~ion, and coefficient of skewness <br /> <br />~f th~ logarithm~ ~f th~ "~~ple ~~9~r\'ati~ns. <br /> <br />That area of the floodplain in whIch the waters of <br />a lOO-year flow will not attain a m.~xlmum depth greater <br />than One and one-hnlf f~et. <br /> <br />The winding of a stream channcl. <br /> <br />The largest val~e of streamflow attalned by a flood, <br />usually reported in units of cubic feet per second. <br /> <br />Is the dischrage of water, in liquid or solid state, out <br />of the atmosphere, gcncr~11y upon a land or water sur- <br />face. Precipitation Includ~~ rainfall, ~now, hnil, and <br />sleet, and is therefort' a more general tem tha" rainfall. <br /> <br />31 <br />
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