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FLOOD08996
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Last modified
1/26/2010 10:07:31 AM
Creation date
10/5/2006 4:01:13 AM
Metadata
Fields
Template:
Floodplain Documents
County
Weld
Community
Weld County
Stream Name
South Platte River
Basin
South Platte
Title
Special Flood Hazard Info Report Volume 1
Date
4/1/1977
Prepared For
Weld County
Prepared By
US Army Corps of Engineers
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br /> <br />GLOSSARY OF TERMS <br /> <br />flOOd <br /> <br />Flood Staqe <br />The st~ge or elevation at which overflow of the natural <br />banks 01 a stream or bOdy of wator begins In the reach or aroa In <br />whICh the elevation is measured. <br /> <br />An overflow On lands not normally covered by water and <br />that are used or usable by rTIIIn, Ffoodsn"vetwoessentialchar. <br />ac-terlstlcs: The inundation of !llnd is temporary; and the IMd <br />Is adjacent to and inundated by overflow from a river or stream <br />0.. "n OC9"'''', lake,orotherbodyofstandlngwilItcr, <br />Nonnallya flOOd Is conslderOd "5 any temporary rise in <br />stream flow or stage, but not the pondlng 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 ~nd 10c~1 dr~lnage ch~nnels. creation <br />of unsanitary conditions or other unfavorable situations by deposi- <br />tion of m~terlaJs in stre~m channelS durlng flOOd recessions, rise <br />of ground water coincident with Increased stream flow, and other <br />problems. <br /> <br />Head loss <br /> <br />The effect of obstructions, such as narrow bridge open- <br />Ings or buildings that limit the area through which water must <br />ftow, ralSlng the surface of the water upstream from tho obstruc- <br />tion. <br /> <br />Left Bank <br /> <br />Tho bank on the left sldo of a river, stream, Or water <br />course. looking downstream. <br /> <br />flOOd Crest <br />The maximum stage or elevation reaches by the waters of <br />a flood '3t a given Incatlon, <br /> <br />, <br />, <br />" <br />I <br /> <br />RlqhtEklnk <br />Tho bank on tho right side of a river, ~troam, or water <br />course looklng downstream, <br /> <br />FlOOdPlain <br /> <br />la-Year, 50-Year, loa-Year, 500-YeilrFlood <br />A flood havln9 II 10,1, l,and.2percelltprobebllitv. <br />respectively, of occurrence in any year or en average frequency <br />Of occurrence 111 the order of once In 10, 50, IOO,andSOO-years, <br />respectively_ The flood may occur In ~ny YOlar. It ls besed on <br />statistical analysis of streamflow records end analysl~ of raln- <br />f'3ll and runoff characterIstIcs Inthtlgonorlll reglono/the <br />watershed. <br /> <br />Tho reletivOly /Iat area Or low lands adjoining the <br />channel or a rlver, stream, ..ater course or ocean, lake or other <br />body of standing water, which has been or may be covered by <br />f loodw~ter. <br /> <br />Flood Profile <br />A graph showinn the rel~tlonsh;p of water surface ele- <br />vetiOllto locatlon. tho latter generally expn.ss..d..s distllnce <br />above mouth fora streltmof water flo'oling In an open channel, It <br />is generally dr~wn to ShOw Surface clovatlon for the crest 0/ a <br />specific flood, but ~ay be prepared for conditions at ~ given <br />tlmoorstaqe. <br /> <br />" <br /> <br />19 <br /> <br />I <br /> <br />, <br />
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