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<br />GreonwoodGulch, a trlbutllryof LlttloDryCroek,hllshlld loclllcMan-
<br />Mllllterlltion5<15/1 result of urban expansion.
<br />~;o ,"'''J or flood contro I Improvements Oi} '10 been 0'.11 de on the
<br />at,'"", strellms in th Is ;"oort. Even thoug.., IlIr<]o storms h~ve the poten-
<br />tillltocllusedllr>ageancarehlllardoustoresioonts living 11 Ions them,
<br />~lISt floods have not been serio,," enough to bring flood control pro-
<br />jects 1 nto ex i stcncc. :.~ I n<)r chllnr\C i j mprovoments that have boen made
<br />were primar! Iy r05-J Its of urbani 7.1I+10n. ~o Feder-al flood control 0,0-
<br />j~cts h"ve bo"n bu i It on the~e streams.
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<br />ST/','IDA::lD PRQ,~CT FL(,'O']S .!! repr()son' ~1'e ,ea5oM" Ie "o~er ';"11+, of
<br />'loo~1 ng. The Stuncllrd Project F I oed 1 soot ~~e '''''')05t t I oed that
<br />coul~ (NOr occur. Tt,e Standard Project Floods were d<Jv€lI"~ed by
<br />studyi ns known extr"""", s~orm'; In othor iocatT,,~s, C0rrtOlilt"d "Ith ru~-
<br />off est ie>atQS ~rOlt !>as i n ra I nfa I I nnd d i .chnrge dnta t~ker, from
<br />similar basi n~ WortO "'Qre ~CCvrate <~nd det~ i I<J<I Jatcl waS dV8i lab I<J.
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<br />FLOOD D^HASES whiCh '~oLlld na'~ resLJlt frO(" high intensity storcos cvar
<br />tna study stroams wou 19 b<J mucn greater th~n tor slmi I~r pr-evlO1.l5
<br />5tor~5 bocause of i~cre~sed develo~nts in th~ llood pl~i~~ ~~d
<br />throughout the dr~in~ge b~si~s.
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<br />FLeo) 'IIARNING ~E.ASIJRES I~ the Denver metropolTtan aro~ have !>esn stu<;!ied
<br />and ostat>lished by the Environmental Scienu3 Services A4mTnlstratlon
<br />We~ther- ~r<J~LJ. The Weath<Jr Bureau, with offices et Jc~ver and with
<br />5upportof tho Rlvor ForecastConter at ,'(ansas City, is r05pOMible
<br />for providing rlvor forecasting service. The firs~ ph~se Tn I~orovin~
<br />t~ Is sorv ice WaS completed with the e;ta:J11 shm"nt of a reportl nn net-
<br />\/orl<,ln 1966.
<br />The ~e8t~er 8ureau is aware of many of the flood pro!>len5
<br />in thl5 are". !-kJwever, 11",ltatlons In faci I itics and "",nO'J'der h~v(\
<br />,Qt;>e:mitted1CJsirablucoverag€landprocedurfidf>velopm"ot. In'a'(>a;
<br />~he'" t"e tirn" int"rvJ I O<Jt'Ho,"n rain "od t~o f lood cr(':~t 15 re I~tlvcly
<br />5h;o:'"t, 5~oclal ~tn!il," a,w ropor.ing ",.tworko; could be e~tabI15ho~ in
<br />cooperatlon'dith local cO<nrlunities l'oprovldet,m<Jlywarnlnqs. Toa
<br />c~r~"lr cxtcr~. ~~ch coopcr~~'cn T~ Dol.oJ (J:;tabilsheJ, but not h.l t~",
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<br />)URAiION CF FLOOOII~ due to the steep gr8Cionts Is rel~tivoly short.
<br />Fla5h flooding, wlfh It5 very rapidly rlsino watBr, hl~h vslocitl<Js.
<br />and short dwr~tlo"s, is the most ConlI'T10n type of '1001 "xperie~c"d i~
<br />thessvalleys.
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<br />I!AZA'l;[)Q"JS COkDITIO:IS '~olJld ocr;wr during la'-g'" flooo~ ,'~ a re~wlt of
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<br />the rapidly rlsi1J s~re~~s, hl0h v<Jlocltlcs, aod Goep flow,.
<br />'I<J I <X; i t- i oc ~rcater than :5 feet "sr second comb i n0u '~i t'~ d"pths of 2
<br />f.wt- or gr,,~ter are gener~lly consideroc hazardous, t>uf le~~er
<br />ve loci tl s5 a~d Jeptr.5 Sr.DU Id "I so bA ra"pect,,".
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<br />FLOOD C0'1i~L ND OEFE;,SE ~as developed prlmari Iy o~ Littlo Dry Creo',
<br />in I\r<lpahoo Cou~ty In re$pOflSO to p"st i loods on th I 5 str<Ji'lm. ThD
<br />(nylswG01 U~M w~s c~nstrucfed by the ~ork5 Proore~s ^d~lnlsfration
<br />I n the ,,,,i~ 1930's, ",01 1url fie; tho SeMc poriod of tlrc.e, chan~'" I lre>>rove-
<br />ments In He nafc'r", Df strJlghtenir><; ~~'J "nlar~in<J '~ere ut\J.Jrt~ken by
<br />1001 I I ntor"5ts. ti<;"cntly "n u~dor9rou~d condw it has "m'" corr,+ruct,,<I
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<br />b"~,,,,'h ..", r_:i~~"~,,II~ ~ity ~h"~rin~ c~~t<>r In r"1I"w<:>n~.
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<br />A~ nr,,~,,~t.
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<br />extent and detail nC<JdeJ. !'ladar =y eventually I>e of ~"jor ilS5istance
<br />in flash f I cod wJrni"9 I ~ tile JreJ. It """y be '" few years, however,
<br />before "u Itab 10 redar is aYe i Idb Ie. 1 n '!"~e inter im, the ~'cath()r
<br />8ure~u C(lr'\ prov i de thB e5s""t i a I s fo" '~arn I 'l<J5 based o~ ,~,.ath€r fore-
<br />Cd5tS dusfondti"J the 3eneral aroas who.-e ~~~vy prociplt~tlon Is
<br />expoctad. Tilt! network of river an<.J rainfall repodlng stetior>s, pro~
<br />JorlyJ<lrr.lnlstor"dond'.'ithp'.lbllcendrr>unicipal support,canprovide
<br />~ r~"50n;lblo lov<ll of fl=d '.'Jrr'\lng 5orvi<:e.
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<br />it I s only ~"rti1>lly cffm:tlve dnd Its e'fnd ""5 nof iler,n eVil Iwat&\!.
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<br />Se,. Gloss~~v ot TcrM5
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