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<br />ALTERMTlVES
<br />
<br />B<lsin-ScaleAlternatives. Basin-scale alternatives were dcsigned
<br />to determine the eOHS required to provide flash flo"d detection OVer
<br />the eatire lllOuntaln "rea of th" hasln. Rain gages ,""ould be u""d ovcr
<br />the ba.ln bet"'ccn the 9000-fo<>t..levatlonllnd the canyon Muth.
<br />Additional ~ea<:hea of the m,~in ate," a"d )iorth ,ork would be covered by
<br />atre"", gage.. r"'oalternarive" dtd n<>t involve fietddeteetion
<br />device~, although by their nature they would co~er the enttre bAsia.
<br />One of these would be the <.lse of a color radar receiver at Fort Colli nS
<br />"'hieh"louldshO'" the basin as seen by theN"\lS Cheyenne radar. The
<br />other involve. the employment of a private meteorological consultant
<br />for the Lart_r County area.
<br />
<br />A r<lnge ~f flash flood dPtcctlon alternative~ wa~ formuldted.
<br />'TIle.e ~ltern<ltives ~An he Implem"nted by local tn~erests usi".€'; the
<br />larest ~no,""n eom,"ercial equipment. In all plan.., _1n emergency
<br />up"r"ti"n~ center ",a" ,~3su"",d to be Inc~t"d in Fort CnUin$, where
<br />re.ource~ would be availllble for 24 hour ~nitoring tf n~cessary,
<br />
<br />The alternatives ar~ classified by their geographic coverage
<br />",lnh",m, tntermediate, or ~sin",ide. The alternatives "'ere al.o
<br />class Hied according to their method of fhld obs"rva~lon, i.e.,
<br />volunteer, ~ixed autoiIlatic and volunteer, or nIl auto~tic.
<br />
<br />Miniwm-Scale Alternatives. MiniTD"IIl~scale alternattve :'let"'orks
<br />
<br />Description of Alternatives. A su~ary descrlptinn of each of the
<br />alternatives is presented t" the following paragraphs. Alternntives 4,
<br />SA, SC, 5D, 5E, nnd 6 are shown on platea 13 thrO<.lgb 18.
<br />
<br />are considered to be the smailest si.e that wo~ld provida a significant
<br />degrea of flood detection. They could be Lnpleillented as tnteri..
<br />3.ltern<ltives tn the ea.e d phased development. The mInimum-scal~
<br />alternlltives <.lSe II fe", stream gages on the main stem aad/or Jorth Fork
<br />and a mlnimal rain ga"e ne~"'ork on the "atn stem bas I n. The "pper
<br />portion of the North JOork basin co"~rtbutes runoff ""nstderably tllOU
<br />.lowly than the "aIn stem, 1$ s~anely ~QPula~ed, a"d covers" large
<br />area. Therefore, rain -",ages and 8trca" gages ",cr" placed o"ly In t"~
<br />
<br />The..inirnu:ll-scalealternatlvesinclude:
<br />
<br />. Volunteer rain and aUea," gage. observen tn ]lll\in st"<I\ basin and
<br />on ~onh Fork (AlternatIve 1).
<br />
<br />",-Ai" st~OI 1M.I" "n<1 1" ~hdt. ~,,<t iou 01 th" Nort.h iork do"'ns: ream from
<br />
<br />. :tixednetW'ork,"'ithvolunteerr<linandstreamgagcobs<,rvefson
<br />the []I>l:lnsteOls\lpplementedbya"tomattc rainaodstreamg"ges tnrem ate
<br />ar~aa (Alternativ~ 2).
<br />
<br />IlalHglln Res~r~oit.
<br />
<br />Inter""'dlate-ScaleAltern1ltives. InrerOled11lte-scalealternatives
<br />~'ere developed of 11 shl> b"tween that of the mIni",u<l-.cate ;llt..rnatives
<br />and th1lt of atternatlves tre..ting the entlre basin. TheYilppeartobe
<br />ad"qudt" tn .cope to meet th~ flash flood detectiG~ need~ of the study
<br />are.., as far a" ts ~nctIcal. The Intermediate-scale "lt~rnative5
<br />include mor~ rain gages and/or "tre~," lIalles than the ",lnl""'",-scale
<br /><llternatt'les. Fn..eeason.o<.ltlinedprevinusty, no detection d"vice.
<br />~'~u1d IX' ph"ed in th~ \Ipper ~.ortM Fork wat,'e.;'~-J.
<br />
<br />. AutO..Hic radio-r..porting tain gages in rMln stelll ""3in ~nd
<br />strea~ gllge~ on Korth Fork (Alternatlv~ 3).
<br />
<br />The interrnediate-sc3le alternatives inclu-Je:
<br />
<br />. Voiunt~er rain and .t..eam gage ob""t~ers in maIn ;tem wdtee,hed
<br />~nd on ;;"rt~ fork (.~:~ern"tlve 4).
<br />
<br />..,
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<br />
<br />e,
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