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<br /> <br />CHAPTER II - KETEOROLOGY AND HYDROLOGY <br /> <br />4. AIltec.d.Dt coDelitio.... - <br /> <br />.. Gen.ral. - Duriq the villt.r ....011 of 1972-73. .tora event. <br />ov.r eouthve.t Colorado and over part. of Utah culainated ill a IRUch <br />above .v.r.Be ._ cov.r. W.t.r content of the aDOWPack exceeded pre- <br />vioue r.cord. ill .0.. .r.... The ..jor .tora event. d.po.ited aa UIlU'U- <br />ally heavy ._fall .t the lov and iDtemediat. el.vatiollll of the vater- <br />ah.d.. T..,.r.turea during the lllOV accuaulation ....on of Octob.r <br />throuah April aver.g.d cOllllider.bly below nor.al. aad teap.ratur.. during <br />the ..U ....OD of May .nd Jun. .v.raa.d abov. DOrul. Peak l'UIlOff <br />occurre4 4urina May for the int.rM4iat. vat.uhecla. aa4 4uring .arly <br />JUIle for the hillh.r dr.inell... Peak flow r.t.. wer. DOt r.cord break- <br />ing. but hi.h enough to c.ue. .1&n1ficaat flood d_.. 10. eo_ .r... vith <br />Duiaance flooding in other .r.... <br /> <br />b. Soutbv..t Colorado. - Extr...ly heavy precipitation ill October <br />1972 and .hov. 1lOr.al lmOUIlt. ill Decellher re.ult.d ill a vatar content <br />that va. 250 to 300 p.rc.Dt of av.rage iD the vat.nheda of .outhve.tam <br />Coloraclo. <br /> <br />Precipitation duriq Jaauery aa4 February 1973 v.. l1&ht. .v.raaina <br />near 75 p.rcent of DOr.al for the p.riod. Wat.r cont.nt of the IIOUIlt.lo. <br />enovpac:k .bowed . d.cr.... dur1o.& F.bruary. and. at the and of the _tho <br />vaa 128 p.rcent of norul for the upper Saa Juen Buill. 133 percent for <br />the ~..f.... &iv.r Be.iD. aDel 140 percent for the Dolore. BuiD. <br /> <br />Karch pr.cipitation v.. v.ll abov. nor.al. upecially at the lover <br />.l.vationa. DuriDg the IIOnth. the .nowpack ov.r the ..jor v.t.r.h.d. <br />iIlcr....d 15 to 20 p.rcent. T..,.ratur.. for the IIOIlth averaa.d n..r <br />3 dellr.e. below _rul. <br /> <br />April va. a cold IIOnth. which r.tardad .__It fro. the low .Del <br />iDt.rMdiate l.v.la. Pr.cipitatioD va. n.ar norul at the hi&her .l.va- <br />tiollll. At the and of the _tho the vat.r cODt.Dt of the lIOuDtaiD <br />.nowpack v.. 160 perc.Dt of norul OD the Upp.r Sea JUIIl Buill. 180 <br />percl!llt OD the AIlu.a. &iv.r Be.lo.. .Del 170 p.rc.Dt for the Dolor.. BuiD. <br /> <br />Pr.cipit.tioD duriq May va. above nor..l for lIOat .r.... aad t..- <br />peraturu were aa.r IlOrul. Th. .Dovpack .t the low aad iIlt.raediat. <br />level. vaa depleted duriDB the lIODth. re.ultiq 10. peak atnllJlflow <br />ratel. <br /> <br />2 <br />