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<br />CHAPTER VI <br /> <br />GLOSSARY <br /> <br />Backwater Effect. The rise in surface E:~levat ion of flowing water IIp::;tream <br />from and as a result of an obstructiolJ to flow.. <br /> <br />Channel. A natural or artIficial <br />--- <br />definIte bed and banks to <br />periodically flowing: ~.,ater ~ <br /> <br />tolat:en::OlJu:,e of perceptfhle extent: with <br />confil'::~ a.nd convey cClntinuOl~sly or <br /> <br />Cloudburst. <br />----- <br />in areal <br />lightning, <br /> <br />A sudden and extremely heavy dnwnpour of <br />extent, of short dura.t:ic.)"] ~ and may <br />thunder, and strong gusts (1.; ,,,ind. <br /> <br />rain that is small <br />he acconpanied bv <br /> <br />Designated FloodplaIn. The area designated as a floodplain by official <br />action of the Board of County Comrnis~;,:[(nE!r5 or City Counc:il tdth -ell!': <br />prior concurrence of the Colorado Wate:- Conse~!ation Board. <br /> <br />Flood. An overflow on lands not normall'\, I:nvered by \o,Tate:r and thi3.t are <br />used or usable by man. FJoods have tlilO essential characteristics: <br />the inundation of land is temporary t wed the land is ad.iacent to and <br />inundated by overflow from 8. river en: stream or andoceant ],nke or <br />other body of standing water. <br /> <br />~ormally a flood is considered as any temporary rise in streAIll Clow <br />or stage t but not th€~ ponding of Gu)~face water, that results i.n <br />significant adverse effects in the \llcinity. Adverse effects may <br />include damages from overflow of .Tand areas, temporary backwater <br />effects in sewers and local dn:dnage channels, creation of unsanitary <br />conditions or other unfavorable situal:i()[!s by deposition of materials <br />in stream channels during flood rl2'cessions, use of groundwate:" <br />coincident with increased stream flow" ,:ro.d other problems.. <br /> <br />Flood, IOO-Year. A type of flood, includ-Lng the water surface elevation <br />and territorial occupation thereof, wI) fell can be expected to occur at <br />any time in a given area based upon r!~c()I'(3ed historical precipitation <br />and other valid data, but with an .:3'lfrage statistical one pp-rcent <br />chance of being equalled or exceeded during anyone year, The term <br />is used interchangeably with a one percent flood Dr Intermediate <br />Regional Flood (see definition for ~ntermediate Regional Flood). <br /> <br />E.~)od Crest. The maximum stage or elevCl"";" :)11 reached by the 'Y7atE'1" of a <br />flood at a given location. <br /> <br />I!.?od .Frequency. (See Probability.) TbE~ ,~i.'Jerage re:currenee j ::1terva] of <br />specific discharges or water stages v,Th:( c1-: cause flooding. <br /> <br />..!:.:~)Qd Peak. The maximum instantaneous dL:c'I~'.arge of a flood at a given <br />location. It usual.Iy occurs at or n~2r the time of the flood crest. <br /> <br />!,loodplain. <br /> <br />An area in and adjacent to <br /> <br />'i1'ream, which area 1s StlhjE:Ct" <br /> <br />22 <br />