FLOOD04621

• County: Pitkin
• Community: Pitkin County
• Stream Name: Crystal River, Coal Creek
• Basin: Colorado Mainstem
• Title: Floodplain Information Report
• Date: 1/1/1979
• Prepared For: Pitkin County
• Prepared By: Wright Water Engineers, Inc.
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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GLOSSARY

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Basin.
face of

An enclosed
the earth.

or partly enclosed ...ater drea or depression on the 5ur-

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Q'!.,~1n..at'!.':! floodplain. The area desigfidted as a floodplain by official
actionltne t>oard of county cOI..~issioner5 or City council) with the prior
concurrence of the Colorado Water Conservation ~oard.

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Flood. A tempordry rise in the water le~el of ~ stream or basin tMt results
in inundation of overflow areas not usually covere<i tly water. The lOO-year
flood is a flOOd with a peak flowmdgnitude that has a I ;JCrcentchance of
being equalled or exceeded in any g1v~n year, and a frequency of occurrence
Ofdbolltl in llJOyearson the long-term average.
~l.o<.><Lfr'?~en0:' The average freqllt'ncy, statistically determined, for which
~ specific 7Too<i flow magnitude may be equalled or exceeded. Frequency is
expressed as an occurrence within a specit'ied number of years.

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Flood profi Ie. A graph or a plotting of water surf<ICe ele~ations of a spec;-
fie flood frequency of a stream or basin.
Flood protection level. A level which is established above the lUU-year
floOd elevation for regulating uses in high hazard areas.
Floodplain (geneNl definition), A11 area along and adjacent to a stream or
basin whictl is subJect to flooding.
Floodplain (reguliltory definition). An area 1n and adj"cent to a stream,
which are" is subject to fl ()Qdi ng ~~ the resul t of the occurrence of an
intermediate region"l flood and whlCh area thu~ is so adverse to past,
current, or fQr~seeable construction or land use as to constitute a :;ignifi-
canth"Zdl'd to public health and sJfdyor topropertj.

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lntcr<"elliate r~'l!.~'!Lr~O~(!: A typ.. of flood. including the water surtace
elevationdnd territoriafoccupation thereof which can be expected to occur
at ,my tim<< in a 9iven dre~ Il~sed upnn recorof'o hi Hnr;(~l prociptiation an,j
other ~al id data, but with an average stati stical 1 percent ch"nce of being
eqUdlled or exceeded <luring any) year. The U!rm is used interchangeaoly
with a I percent flood or 100-yNr flood,
Obstruction. Anydam.wdll,wharf, embankment, levee, dike, pile,abutment,
~P'oj,,~tion, ~~~dVdtio", ~;,,,,,,,..l p,,,(~;fi~dti<.>n, bri.cig\:, conault, c"l'iert,
boi 1 d i og, wi re, fence, rOCK, gravel, refuse, fi 11, ~tructure or m~tter in,
along, across, or projecting into any Channel, watercourse, or regulatory
flOOd hazard area which !TIay impede. retard or change the <lirection of tne

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