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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 rU1l0ff channel Dr basin, liS
<br />such stDrm or 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 frDm the accumulati\lO of
<br />storm or floodwaters..."
<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 />fDr municipal governments of
<br />1973.
<br />
<br />governments and
<br />the Colorado
<br />
<br />Section
<br />R.evi.~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 l"egulati.)n of the flODdplain areas such that fl,)od
<br />hazards and future flood damages are minimized. It includus
<br />information .)n historical floods, existing factDrs 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 />IOO-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 repvrt by the Colorado
<br />Water Conservation Board, the areas described as being inundated
<br />by the lOO-year flood (Intermediate Regional Flood) Clln he
<br />designated as flood hazard areas and their use regulated
<br />accordingly by the 10ca.1 agencies. The terms "Int"rrnediate
<br />R.egional Flood", "lOO-year flood", and "one~percent flood" Can be
<br />used interchangeably as they arc all defined by the same type of
<br />flood ev"nt (see Glo"sary). However, to aVvid confusion, the
<br />term "lOO-yoar flvod" will be used exclusively through0ut 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 />Cvunty.
<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 Colorad\l ~,'ater
<br />ConservatiDn Board, and the Pepllrtment .)[ L<:>cl\l Affairs. Mapping
<br />I1t a scale of 1" .. 200' and 1" - 100' with 2 foot contour
<br />intervals ;,as prepd.",d \",d"lC ..:ontl-"ct "ith L"k", Cvu"Ly i;y "",il
<br />Mapping CQ. of Denver (Reference 1).
<br />
<br />B. Autho:dzati.)n
<br />
<br />Th" Dv..i-d' s f"~"i,;,r ",rod ch;ty ~~
<br />
<br />" to devise and formulate methods, means and plBns f.)r
<br />bringing about the greflter utilization Df the waters of rhe
<br />state and preventi.)n ryf flood dam"ge" therefroln and to
<br />designate and approvt' storm .)t" fl.).)dwater runoff channels or
<br />has in" , and to make such desigolltions Ilvsilllble 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 cDntrol survey was pt'rforrned 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 statec
<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~ sectiDns fvr th" study were .}btained by photo~.rammetric
<br />,""thud" [rvll1 ,,<,rial phvtogtaph" t..k,," 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 surfflce elevation8 shown in this report.
<br />All bridges 8nd 0th..r fli"nifiCflnt fltru('tun'g w're field surveyed
<br />by MSM C<lnsuIUll1ts, Inc.
<br />
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<br />
<br />-1-
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