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<br />FLOODPLAIN INfOKMATIOX 8EPORT
<br />AF.KANSAS RIV€H
<br />LAKE CREEK
<br />EVANS GULCH
<br />
<br />N,)vember, 1911l
<br />
<br />The cities, incorpDrated to".'ns, iHld counties ,,;Lthin the study
<br />area ~ay provide ~oning regulatiDns...
<br />n.. .tD establish, regulate, restrict, and lio:it such uses Iln
<br />or along any storm 0r flllodwater run0ff channel Dr basin, liS
<br />such stDrm 0r flDodwater runoff channel or basin has been
<br />designated and apprDved by the C\ll\lrflclo ;"/lter CDnserv/ltion
<br />BDard, in order to lessen or avoid the hazards to persons
<br />And damage to property resulting from the accumulatioo of
<br />storm or floodwateJ:'s..."
<br />
<br />LAKE COUNTY, CCLOR;I.DO
<br />
<br />1. INTRODUCTION
<br />
<br />as stated
<br />31-23-201
<br />Statutes,
<br />
<br />in Section 30-28-111 for county
<br />for municipal governments of
<br />1973.
<br />
<br />governments and
<br />the Colorado
<br />
<br />Section
<br />Revi.~ed
<br />
<br />A. purp.)se and Scope
<br />
<br />This report was prepared to guide local ,)ffici<lls in planning the
<br />use and regulati.)n of the floodplain areas such that fl,)od
<br />hazards and future flood damages are minimized. It includus
<br />information .)n historical floods, existing factors which
<br />influence the flood ha<:at"d, and the nature and extent of probahle
<br />future floods.
<br />The report data includes flooded area maps del inflAting the
<br />100-year flood boundary, flood profiles and typical floodplain
<br />cross ,~ections showing the Wllter surface elevations for the 10-,
<br />50~, 100- and 500~year frequency floods at selected reference
<br />points.
<br />
<br />TherefDre, upon official approva.l of this repDrt by the Colorado
<br />Water Conservation Board, the areas described as being inundated
<br />by the 100-year flood (Intermediate Regional Flood) can he
<br />designated as flood hazard areas and their use regulated
<br />accordingly by the loca.l agencies. The terms "Int..rrnediate
<br />Regional Flood", "lOO-year flood", and "one~percent flood" Can be
<br />used interchangeahly as they arc all defined by the same type of
<br />flood ev..nt (see Glossary). However, to aVDid confusion, the
<br />term "lOO-year flvod" will be used exclusively throughvut this
<br />report.
<br />
<br />chis
<br />80ard
<br />
<br />study ~as authorized by
<br />in joint sp"msorship ".ith
<br />
<br /><he
<br />Lake
<br />
<br />C01.)rlldo
<br />County.
<br />
<br />Water
<br />
<br />Consurvati,)n
<br />
<br />C. Maps and Surveys
<br />Aerial photography and topographic maps for this study were
<br />provided hy Lake County in cooperation with the CoJorad.:J ~,'ater
<br />Conservation Board, and the Pepllrtmeot ,)[ L<:>cIlI Affairs. Mapping
<br />I1t a scale of I" .. 200' and I" - 100' with 2 foot contour
<br />intervals ;,as prepdr",d \",d"r ..:ontl-"ct "ith l,,,k,,, CvullLy i;y "",il
<br />Mapping Co. of Denver (Reference 1).
<br />
<br />B. Authorizati,)o
<br />
<br />Th" DV"i-d's i-").i,;,r ",rod ch;ty ~~
<br />
<br />" to devise and formulate methods, means and plBns t.),
<br />bringing about the greflter utilization of the W>lters ,,[ the
<br />state and preventi.)n ryf flood dam"ge" therefroln and to
<br />designate and approve storm .)t" fl.).)dwater runoff channels or
<br />has in" . and to make such designlltions aVllilable t,)
<br />legislative bodies of cities and incorporated town,;; t,)
<br />county planning commissiDns; and to boards .)f adjustment .)f
<br />. f h' , "
<br />cities; Incorporated t')WnS; and countles 0 t .is sta e...
<br />
<br />The ground control survey was performed to 3rd order accuracy
<br />stRnnRrd" or better as defined by the U.S. Departll'.ent .Jf
<br />Commerce, Federal Geodetic Control Committee. Mapping in this
<br />study complies with the "United States National )-jap Accuracy
<br />Standards' with field d1e<:ks.
<br />
<br />as statee
<br />Stlitute~
<br />
<br />in Secti<)n
<br />1973.
<br />
<br />17-60-106
<br />
<br />0)
<br />
<br />(c:) of the
<br />
<br />Col')r/ldo Revised
<br />
<br />Cros~ sections for the study were .}btained by photo~,rammetric
<br />,""thud" [r,,", "",rial phvtograph" t"ken ull Jun" 10, 1980 and by
<br />field survey methods. These cross sections, whose alignments are
<br />shown On the mapping, were used in the hydraulic analysis to
<br />determine the water surface elevations shown in this report.
<br />All bridgeil and 0th..r fll"nl ficAnt fltru('tun'g ,",'C're field surveyed
<br />by MSM C<lnsuIUll1ts, Inc.
<br />
<br />-2-
<br />
<br />-1-
<br />
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