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<br />flood (Intcr",ediate Regional Flood)l can b<> designatod as flood ha~,Hd
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<br />draindgcs 1n ehe upper '~ater"h~d tncludil\8 Grizzly Gulch, D"er Canyon, and
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<br />areas and theIr use r"8ulated accord1ngly by the 10calagenc1es .
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<br />Baldlo'inGreck. Chalk Creek empties into the Arkansas R1ver belOlo' the sTllall
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<br />co",,"unlty Qf N.Hhror. The Arkans,~~ River Ls a major ~ribut.1rY eo ~he
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<br />Floodha.ard "tlldtes are carried out by the Soll Conservat1onServlc eaS.ln
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<br />.\rkansa"-~11ite-Red \,1.'~er Resollrces Council Region. The s ~udy area is
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<br />outgro"'th of the recommendations 1n A Report by the Task Force on Federal
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<br />Loca~ed "ithin USGS flydro Logic Unlt Code llOZOOOI.
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<br />floodControlPollcy, House Document No. 46S (89thCongre"",A ul>"st 10,
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<br />1966), especially ~eco"'mendation 9(e), Regulation of Land Use,Io'hich reco",-
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<br />Upstream Drainage Area
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<br />"",nded the preparatton of prel1...inary "eport~ for guidance ln those 3reas
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<br />The upsne"", drainage area originates in the Sa",atch Range of the Rocky
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<br />where assistance ls needed before a f"ll flood h'lz,Hd i"formatlon rep<Ht can
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<br />Mo"ntainsatthe top of the Gontlnental Divlde betweenthellrkans ""and
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<br />be prepared or where a full report ls not ~chedul<,-d.
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<br />Gunnison Rtver Baains. Ele"ations vary frollltllOr:e than 13,000 feet along the
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<br />divide to 1,600 feet ("",an aen. level eleva~ ions) at the confluence with the
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<br />Authority for funding flood hazard atudieR 18 p<ovtded by Section 60f
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<br />Arkansas River. Geology in the upper reaches consis~s of mcta1llOrph1c rock
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<br />PuhlicLaw83-S66,Io'hichauthorLzestheU.S. Department of Agdcuttur:eto
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<br />(crystalline), 1llO~tly granite and otl,er igneo"~ type rock~. S<>its ure deep
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<br />cooperate Io'Uh other fed"ral, state, and local as"-ndes to ""ke investiga-
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<br />to ooder:ltely deep 10'1 th rock ootcrop~; :lnd th" rerme.,.bil1ty characteri8tic~
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<br />t ions and surveys nf the '..otershedH of rive.s and other '..:iter way~ US a
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<br />are :noderate to moderat,,-ly rapid. The nearest "eather staUon i8 at 1I",ma
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<br />b,Hh for the develop"",,,t of coord1nated programs. In carry1ng out flood
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<br />Vi~ta, II ",lle~ "orth elf Nathrop. Topography hall <, signif lCdnt effec~ on the
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<br />ha~;1rd studies, thc So11 CO"ncrvotion Service 1s being ,esponaive to El<ec"~
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<br />s"OIi-arid cl1mi1te and the average annual precipitatIon v,"Ht,,-s fr<ltO "bO'-lt II
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<br />tiveOrder t1988,cnt1tled "Flood PislnManalletllent", (cffeetive May 24,
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<br />Lnches at 8u,,"" Vis~a to over 30 inehes tn the htllller ,,.,,,ntaln el,,-vation"
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<br />1977).
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<br />",llere "'os~ of the precipitation occurs as ""Ow. ~eltiog of the anolo'pack
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<br />c'1ll8e~ runoff durlng the sprtng "Cid sustained flow in Chalk Creek. In Buena
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<br />OESC~[PTHJN OF TH~ STUlJY ARF.A
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<br />'HsU, the nO"!lIli ""'-an tel1lper~t'1f"" ran"e from 25.6 degree" (Fahrenheit)
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<br />1n .lan,," ry to 6!,. 3 degr..e" 1n July. The "",an .In''ual ~elllperature 1s 44.0
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<br />Chalk Creek is located in the ~eat c.."tral part of Chaffee County, COlocado.
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<br />dellr"es. More th,,,, 9Z percent of the total drainage are,~ is within the San
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<br />Draining about 90 square mlles, ChaLk Creek flo~" in a general eastward
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<br />Isahei :;"tionsl forest a"cl hnd u8e t"dude~ recreation and grazing. Dcvel-
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<br />direction and i" fed by the North Forl< of G~"lk Creel< ..nd ~\Uilero"~ "mal Ler
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<br />"p""nt on public l~ud wilht,. tile lia, lu,,,, 1 ."rest flo"odar1es is "",l~r "",,-
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<br />IThe terms "inter",,",I!H~ Regional Hood," "10(!~yei!.r n"od,.' an,l ""n"-
<br />perec"c ftuod.' ~a" be u""d interchi!.njleah Iy .,., th"y ar~ a \ 1 def i "ed by ~he
<br />s.""e. ryp" of flood eve<lt (se" Glossary).
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<br />trolLed ~o(\(H~lon8 dad ~1l1 ~av" ",in<>r "fhcts on pO(QntL"l floodi"... In th"-
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<br />.l"Wllstt<,,,,,,,lt"-'''.
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<br />3
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