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<br />.
<br />
<br />iscusslon of Map5
<br />
<br />..fiJW'CI 10 WOYP 41 plCICAl Pf"lplr.tloa-hC"lIlCllCJ gaa~
<br />CDIotado for 6- aDd 14-111 dunUoBl. Fipua 10 Ibroqla 31
<br />c fiN' ....1&11 (01 all-uuoa) yaluca lot the 2., S-, U~. 15-, So.
<br />IOO'YIJCUlIIIpcri0d6.F"IJIlICl31lbrou.....:tucIOl"lboM.y
<br />oup Oaobu ICUOG IUId arc 'Ol P'"~ilitia cI 0.50, 0.20,
<br />,lO,O.04,O,02,.Qd 0.01. The bopluvw D1'p5 Upt"cuDl1be 360-
<br />1Ul1.44O-alill dW"illw.u. for tbe partial-dw.liwa 6Cria. D.1a were
<br />waled lor ~loc.k aDd ob&cruUoIl-day lnlCn'.k for lbc ....uaI
<br />ria aDd Well adjulLcd by * c.mpirial factoR PVCD La dM
<br />u.lALYS1$IC(:Uoll.
<br />
<br />....... ........ The iIollK iowYalltlcc:&c4 wu daJpcd 10
<br />IIOridc . reuoaably COlIIplctc dclcriptioo of the iIoplu.vial paaua
<br />D varitMaI rclJioal oIlbc~. The bolioc lDIcnal ovet InCIIl elf lbo
<br />.lite 011 1DIp' ,~ Ib& 14--hr dlll.oo. iI 0.2 .. for pndpiUdoo-
<br />rcqllUC)' waha bdow 3.0 bL, 0." la. bc.....cca3.0 la. aad '.0 .....
<br />lad O.S la. AI yalua pcalU Ibaa '.Oia. However, iA~
<br />::oIondo UoGJ Ih& 5aA J_ Mouaw.. &be aADul..S- IaI& IR
<br />~u. latcrval 01 0.1 la. bdow ptcdpitadoa..fRq.-cJ \'aluca 01
<br />Uia., IalIO.S iD.10I vuua ovcr 2.0 iA. Oa lbcm.Jl"OI'''' 6-hr
<br />~w.lioD. Lhc bmnal" a.lla. IOf plcdpita1ioe-bcque.uq ow....
<br />1IDdc. 1.2 la. at'" 1-yr ud D.SO aDd 0.20 probabUk)' kvel (00
<br />IUp6 '01 me Wa)' WouaIl CkIObcr ICUOD). AI IoIIpr JCIWlI
<br />pcriodl (or "'Wel probabWtic&), tbc upper IIaUI 01* D.I-iIl. boliDe
<br />lalCn'ulActuIa la Ofdct 10 1ll&i1lW. &hi iaopIllviaI padiIId ao4
<br />de..- 01 _WI. 0. aM ..,. Jar Ibc "' dwaaioa. Ibc IIOIia&
<br />iDknal d1aDaa I,OID 0.1 la. lido. 3.0 la. eo 0.4 ill. OWl" ].0-4&.
<br />pndpilalioll-"cqllC~ valua. Dubcd ialCnudiaIe UIlCI ban
<br />bc&a pJKCd belwcea widely "prated iuIlilla PIlI la tc,tou
<br />wbctc I liacat lDtetpOl'lloa botWRiIl tl:ac AlJnua! bopIllwtaI iaLel\'al
<br />would 'ud to eu_... I.alctpOl.lioll. ~14..~ tbIl 11:1011 wU.bba
<br />Lile boII.odariu 01 . pank:uIat map b.ve. bcCA lmdIed o.a cbo low-
<br />vaWcdlidc 01 abciloliDl.
<br />
<br />......... .. .... .. pndpIC............., ....... 'J1r,e
<br />IIlAUlIIlIJII ia IhiI All... RprAClIl f'eqllCDq' vallla 01 ptcdplll-
<br />IKlG .ep.dkM oIl)'pC. FOf IDIAY bydroao,ic: JIUf'llO"a, pteclpill-
<br />UOD lalliDJ " Bin mllll be: IIcllcd IA . dil"eRIlI fIWlIlCf InNIIlb..a
<br />I.UUt, II UK)W. Tbc ICOOlributioll of uaow alOOUlllS to pnclpi&a-
<br />UoD-rRq,"IKY valua IA CoJurWo aDd lbc Rod.}' Moun1&Ia Slat"
<br />(1OIIpI)' MoflWll, Wyom1aa. CoIowlo, New Muil:o, aDd Utah)
<br />Wli iavaliptcd. Ia ~ area. tbae. wen .bout --SO IlaUGu per
<br />tl.l. uvlDJ 10 to U)'f1 01 ~.doa or uowr.u " part ollhe
<br />p,OIClph..tb obicrIia, PwIfUl- Fo, c.adI IUdl .tadoa. two ....
<br />Krica .us JotIlMd .. diKlIIKd IIndcl IlIlCtpRtaQoa 01 1lcMd1l.
<br />lmpoAlDICC 01 Sllow bt Estiadll, Frequ&DCr VallKI.
<br />A ",Iio." rormed 01 1M 1-)'.2....Iu...ahIe 101 tbc tcria coo--
<br />ta.i.ai.qlllUimuatannUllneall without tcpnl to the I)'peat pi'"
<br />II:lpiClliolt ud die 1-)'r 14-hl val," b the acrica widt I&DW' 1X:CllI-
<br />fClIUI climiaatcd. A p&ot 01 r.b.iI olio VI. latit. (I,. IS) IMWI
<br />tJw tbc nllo tCBdJ to be al . mu1m1l1ll ill 1M lIlilvtk 01 O*wJdo
<br />aDd ULah. Over aU 01 Colorado. tho ...."edpltatioG ICria tCDdt
<br />to .n.... .boul 10 pcrUDI hip" ibiD 1M tcria willi IDOW
<br />sIimi...ted. HOWPeI, eUlllbt.lioo of the dill ibowI hi la cbc
<br />lC1ativd)' fta1 lieu cui 01 .lIIIOOIbed 6.00l)..f1 coalour the direr.
<br />eDICCI bc'WCCD tbc Iwa u.ria arc miDor. With data rrom IhiIlrca
<br />climiDlIN, Ihc di8"ercPU bclwcca tbc two "ria Iverap about
<br />
<br />TO\bIe.: I
<br />
<br />. . f ",c,.\;'o~< .(;,,,
<br />
<br />k--.cJ:""
<br />
<br />R.".. II .ppllubllll)'e
<br />
<br />Sooth PIIU., Republic..in,
<br />ArbnW5, .nd ClrtWuon River
<br />8a5In5{l)
<br />
<br />San JUln, Uppef Rio Grande.
<br />Upper CoIOfildo, a.nd GunnlW)R
<br />Rlvar S15(1\5 lind Groen Rlvef
<br />S.lIn below confluence with the
<br />Vlimpa River (2)
<br />
<br />Vamplllind Gre.n River Blillnl
<br />above confluence of Gr..n.nd
<br />Vampa Rlverl (3)
<br />
<br />North PllttIi (4)
<br />
<br />
<br />.
<br />
<br />Hr. V~,\4" :~lp\M
<br />
<br />
<br /> ....A.t SlIndlfd
<br /> Corr, No.ol eomplIl.. .If...'
<br />(qulillon ICD... tlltloo. Iln.valllll ..u....
<br /> (lIIeb..) ("ell..)
<br />Vi.... 0.218 + 0.709((X,)(X./~n 0.94 7. 1.01 0.074
<br />V,,,,, = 1.897 + 0..U9 [lX"ICXeJl(.1)
<br />- 0.0Q8Z ... 7. 2.68 .317
<br />y. >--'" ~ 0.011 + 0.942[{X,)(X,/X.)} .9. .. 0.72 .08.
<br />Y'OIO =- 0.494 + 0.755(1)('II>4/X.1) .90 .S 1.96 ,290
<br />
<br />.. ,. ... .N
<br />LN~:;S'~mar.~
<br />
<br />'1. = 0.019 + 0.71l((X,}(X,Jx.n
<br />+ 0.001Z
<br />VII.. = 0.338 + 0.670Ux,)(XJx.n
<br />+ O.oolZ
<br />
<br />Y, = 0.028 + O.890[(X,)(X1JXJl
<br />'111.=0.671 + O.7!)7Hx.)(X,Jx.n
<br />~0.003Z
<br />
<br />,.
<br />
<br />...
<br />
<br />Fla." 11. ..10 01 2-" 14-1v wrI," 10' all do,. '0 1-'1' 14-'"
<br />__ jQr,tIiIIJalJOIIIy III. Ilu/.wh.
<br />
<br />..2 98 0.40 .031
<br />.80 79 1.04 .141
<br />.93 90 0.60 .062
<br />.91 .. 1.11 .236
<br />S.. 'ext 101 mOfe compl.t. dlicrlpUon.
<br />
<br />'1faiiRIiiii In plfentheMI f.far to &.o&~phlc r.&ion, Ihown In fi&ur. 19.
<br />
<br />1I5tolVlrillblu
<br />'1, ""'" 2.)'r }-hI .,UNted ....Iue
<br />'11. =- IOG-yf l.hI liUmated II.IUII
<br />X, __ 2-)'r 6-hr value Irorn IQclpllatlon-freqllenc)' mapl
<br />X. ..... 2-)'r 24-hr v.lue hom pllClpitAUon-lrequancr mlpI
<br />X. ..... )OO-)'r 6-hr ....Iua rrom pllCipllltlon.'raquancy ~PI
<br />X. """ 100-,., 2.....hr ....Iut trorn plef;lpllllion-'requency ~p.
<br />Z _ point .1.~Uon In hundrelil of r..1
<br />
<br />I
<br />
<br />15 pcruat. witb IOme badividual dilerellUl II IlfJC .. 40 to 50
<br />pcfUlIl. Abou& Ia." the ttaliOai b.ve W8cl'UICa pealel lbu 10
<br />pcrUAI. ThQe dirh:rc:1ICCI illdlule Lil.1 hequeik:)' valllC:li WlIlputcd
<br />rlO18 III .nnual "del or rail"all .1ft000ll Oil')' wollld be diftcreol
<br />1t\MU 1b0K c:ompuKd (It .U-prC(:ip.ilaooll valllU, aad IWO "p.nole
<br />"'" '" prc:c:ipi'lliou.Irc:'1uelll')" IIIApl well: II~.
<br />Saowfall ot>>ctvAU(lIII ate Dl'dc. al 001)' lbouf 15 pcfUDl of
<br />Lile pRcipilltioG t..liON ",cd ill thil IlwI)'. FOf WI fCIIOfl. .
<br />fliofall_frcqucD(;)'''udy(;OlIIdftOlbeln.dc.b)'diroo;:&~.
<br />SiIlCC tDII5I wowtall txX:Uf'5 durinllhc wider bill 01 !be. )'Uf, .
<br />Krier. WlltalniDJ Olll)" Valli" f(tf Ihe MlY to O;;LObcl KNOll ...
<br />wmplRld wilb IlK iCriet. th.1 WII blKd 00 rahlfaJllIClI)'. 1bc tWO
<br />Krier. wcrc in JOOd Ilrcemenl. u.Upl ror . lIiaht b1" 10wlnI
<br />hijhcr vaJua rOI lhc M.)' 10 October lCUOG. nil bw rcwlll
<br />hom 50IDC latle amolln~ in I.IC (ktobcr .nd carl)' M.)' ~..
<br />II IQOW aod lhlll u.c1l1dcd from thc rainfaU-oaI)' Kria. The .ver.
<br />'ac diflelclICC it only .boUl -4 pcrce~, wlLil fIO WNittCftI ptdcr-
<br />eacc toward bi,bcr ekvalioot 0' paflU:lIllr JCOI"'pbK: .eliOlU.
<br />Two "It 01 fDlpt. wcrc preparcd ror CoIurado. The lint K'
<br />colllisll 01 annllal lIl'p~ tNa5cd on prcc:ipitalloa dill hom III
<br />monun or the )'ur Wilhoul rCllfd 10 the Iype of p'u:ipilltiOAi raiA.
<br />rain aad WlOW mixed. .11 U10W. hail, ctc. 1bc KCOCld Iotriet lIk"
<br />plCdp.illlioll vaJUCllrOPl the Dlonw May to Octobc,. No auclUpl
<br />wu DlIdc in tlW. KWOO Itriel 10 diBerclllilte be:lwCCD I)'pc:a; 01
<br />predpitation CX:lI:wria, wlihin ,huc monlh~. but the iflvcwipllON
<br />cncntioaed iA thc prcccdinl patllflpb illdill:ale &bll Lil~ mlp' will
<br />.pproulUllc me Vllliel Ib.t would be abllincd by lll.iftl a d.u.
<br />leriel made lip of prell:ipililion cvellll Ihll .rc cU'lI5ivcly rlia.
<br />Siacc dill lor onl)' pM& of lhe )'car werc IliCd, Ibue mlJII blve
<br />bcm labeled with lhe .ppropriate puJbabililiQ flLiler than with .
<br />rClllrnpcriodiD)'cmlfip. ]2-4)).
<br />
<br />:..
<br />.....
<br />I::.,.
<br />,I
<br />.
<br />1=
<br />s: ,.
<br />..
<br />..
<br />..
<br />..
<br />..
<br />..
<br />
<br />.;.
<br />
<br />I
<br />
<br />'.
<br />
<br />~c.........C'~'
<br />
<br />.
<br />
<br />.."'\.- .
<br />
<br />-.'
<br />
<br />OIJratlon (mln) a 10 la 30
<br />R.t1o 10 l.hr 0.29 0.45 0.57 0 .7'
<br />
<br />(Adopled 'rom U.S. W..lhu BU/..u TechnbJ '1ipaI MIL 'fo
<br />1961.) J
<br />
<br />Procedure. for E.Umatin. V.lu.. for
<br />Dur.tion. Othar Than 6 .nd 24 Hr.
<br />
<br />The iiopluvial m.p' in tbil All.. .rc lor 6- lAd 14-~-..:::
<br />IiCIIII. FQt DWIyll)'drolaJic pulpOlCl. vall&a lor omer dur~
<br />DCCCI6II)". Sucb ValllCl un be C$l!mllcd lilia, tile 6- u4 .:...
<br />cup' and tbc aaplrk:a1 metbod& ootlined ill tlte roUowia. -==-
<br />ThII pl~wa detailed below IQt obtaiain,l-, 2-. &ad J___
<br />ID8ICI were 4cvdopcd apcci6W1)' 101 uu. AtIu. Thc procc=
<br />lor obtaiAial ClliIllolICl lor Ie" thaa. l.bI dw.tioIt uti (oc
<br />dllratioao wcre 8doplc4 'IOID WNI4" 'I.I"GU 1"lInkDl'~
<br />40 (U.S. WcaLiler BWClIll 1961) oaIy eller btvnliplioll dc=
<br />atraud tbcir .pplieabllilr loP dill boa dac UCI ICQvucd bY
<br />"....
<br />
<br />........ .. .......... ..., (....).. '," .
<br />t'fCKJ' ....a-. Multipk-rcllCUIoll Kfccnial tcdwUqua waz:;
<br />to 4cvdop cq...uou IIX c:willl.uoa I-br dlllrltioa ulllCl. Fa-
<br />~idcrcd ill IIr.c ,""IIiIlI plOlCCll wcq rauiICu:d 10 Ibo.&
<br />!COuld be dc\CtlDlacd cailr from die: .'P' ol IblI A.LIu ~
<br />JU"aD)' .vail.We topoSnpIdc ..,..
<br />1bc II WC51erll tllta wuc ICpara&ad lDto Kvcral post:::::::
<br />Rpo... Tho rcJioGa wue dwlIca GO lbc bllia of aacUOfUlL;.
<br />.1Id dilUioloJk:a1 boatoJcadl)' sod IrC Icactall)' wmbina.lll:&C
<br />river baaiu Kpulled b)' ~ divida. Fow 01 Ib-.
<br />..pbk r,polll arc pani"y wiIhIA Cdllrado. Far co.a--=
<br />lad IIiC II ID IIvull)' DA cbc prcdpitadoa-IR:qUUICY m.....
<br />Rpo..... 0IIIllacd OR Ipn 19. 11aa 1m Colorado RP- IS.
<br />at ala. "po.. r.bat Ha to 1M cui 01 ..... CoalbM:ataI Divaa.:
<br />IhO ucu ol lite Sup. III Crio&o sad $Kn.aIcIllo MouII~
<br />lllOUth of tho divide ICpIIIliaa &be draiDlac buiu 01.......'
<br />IDII SOlIdi Plr.uc Riwn. It COIIIku 01 aul pardoe of ~
<br />"drl!tlcd br Ibc: SOIItb PIr.Uc, aepllblku. ^,Wuu, UId Qm;;...
<br />kiVUI (aepo.. 1.1&. 19). The ICICODd rcpoll QONiaIl ol tk
<br />draIud by tbc s.. 1II1II, Upper Rio OIUldc, Upper CoJonckL-
<br />OIlClAboA Rive" u4 b)' the OICCII River belo. Ju !COaAllIwr:=
<br />&he VIIIIpI River (RcalOll 1. I.. 19). Thk it part 01. "rJU-;-
<br />ahat UlCfIdt. 'rOUllOllthwUlera Colorado, wUlward to W WIU
<br />MOOIl'''''' of UIIh. ud IOUthward dlfOllP Ari1Ofl' aod tk
<br />era half 01 N.w loIeako. Tbc lltird fCailNl II lbc ~
<br />portion. 01 dic irA bet.eca the CootIacatal Dirid, aDd ~
<br />of tbc CaKadc Rail.. n. portIoII "I UeI withla ~
<br />lbe aocdaWUlCRI porltoA 0Il.bc SIa&c lNt it ~iacd by tIac Y
<br />Rivu and &be arecA River above ill c:oaIlICIIoU w~ .... '{
<br />(Rep. ). 6,. 19). A UDall ponioA 01 Colondo draiaal :~
<br />Nonh PIaIlC it aepoo 4, Ipre 19. n.c la,," repoa 01
<br />tb. II .. pan illdudu thai ponioa 01 W)'OIIIla, ud Moa~
<br />oIlbe eoaliflcDlIl Divide. EquatioN to provide ulilllolla f;
<br />I-b, dunuoa for 1. aad 1000y. IClU.. pcrioda arc .boWD i~
<br />II. Ab.o Ji"cd arc 1M ..1li&lk:aI pafllDClefl uwa;i.l&G-
<br />cadi oqllltJoa. la tbcw cqll'tiou, &he vari.ble UX1)(X1/X::
<br />
<br />w
<br />"""
<br />('I
<br />.0
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