|
<br />'./; .~
<br />
<br />T. LEFT BANK TRIBUTARIES OF SOUTH PLATTE RIVER
<br />BETWEEN FORT MORGAN AND JULESBURG. COLORADO, .
<br />'-'
<br />
<br />.~i "
<br />
<br />Floods' of, 5;.7 September,
<br />
<br />1. Cause.,:", During't-ne period 5:30 p.m.; ,,6$eptember., and ,
<br />1:00 a.m., 7 S,eptember; a' heavy rainstorm occurred over northeast
<br />Colorado a,nd 'tl1e "extreme sout'heast corner of 'Wyoming and adjacent,
<br />areas. A ,!JlEix'injl.\m rain.fall of'approxiIliately 9 inches wa1! re,Ported
<br />3 m,iles eas:to,fNeV!. Rayirier.. 'Colorado; 6.5 inches occurred,,13 miles
<br />sout1wast ,of. New Rayme'r near "the"headwaters ;'of ,D.eadhorse,p',r,ee~.
<br />)mother hE\avy' rs:i!lfs:l~ "center was: indicated by.. fj inches ,of precipitation
<br />4' mil,es, east of '(;rover ;Colcirado; 'The storm was accompallie;. by
<br />ph8luwElnAi electriiIal' displays,' thunder, and heavy hail_",::,', ,:!he runoff
<br />from this storm caused flooding on Wild Cat, D\!adhorse,!,ntelope,' "
<br />Pawnee, and, Lodgepole Creeks, and on Muddy Creek, a tributary of
<br />. Lodgep.oIe, 9i'e~k. ," "
<br />
<br />2., Extent.,-
<br />entireleng:ths',~f
<br />
<br />'. F'looding ocilurred,thr oughout practi,cdh: 'the
<br />the strE\anis listedi in the pl"El~e<l.ing pa~l'-g~aph., ,.'
<br />
<br />" ,3. Duratimi.;." 'Thesewerll all ',flash f'loods.
<br />hand s:s' to the 'exac-t period of'(jverbarikflow, ,but
<br />to have been less than"16 ;hours.
<br />" '
<br />
<br />'. . " .,": ~, .
<br />No data ~re at .
<br />it is believed
<br />
<br />".;:'\ ..
<br />
<br />..,.
<br />
<br />4, ,Sta~es and discharges.-
<br />
<br />" ,!" Wild'Cat ereek;- An estimated7~OOOC'.t'.s.,piissed"
<br />st;ate Highway 'No.,' 52 in the' central.'portion ,of Wild Cat ,Creek; , "
<br />near the mouth the fl'60d peak;,had flattened Qut to 3,500,'Q.f'.s. '
<br />. ," . .
<br />Th~,flQQd ore~t appears to have reached the mouth about 6:30'a.m;,
<br />." , "'1 . . . .
<br />7 S,eptember."', '
<br />
<br />...."... ;
<br />
<br />. .' ,...
<br />b'.' ' Deadhors9 Creek,. - "'A d1aohar~ detar:mination made::a:t: , ,
<br />, ,two 'pointS' in j;be central' par.t <5f tile: basin indic!,- tad a p~la\C, ,flow .cf
<br />"" "lli,40(),c.f .il>' The flood cres:t reached the moutho:t:" Deadh9U!" 'Creek
<br />at 3 ,Oc> il.".ni.'- 7 Sept'einber. ' ,,' "":
<br />
<br />~. Antelope Creek.- A crest
<br />comput,ed from a slope-area measurement
<br />the mouth' of the str,eam.
<br />
<br />" , ,,:,' ,,", f" ,',
<br />dischar,geQr ,4,400, c.f .s" ,wa'Jl
<br />taken about two miles 'ao'6V'e"
<br />
<br />~., ...~.
<br />
<br />:":ci.' Pawnee Creek....' A peak dischargeofi2~000 c,f,~~W!li
<br />a~:t"rm:ip~d frolll a, slope-il.rea'measurement' of ,tlle,f'lO,od, p:;hm,~!llj;r, ..
<br />;ogaii,:q;;i6radoi ';.. . " '. ,,' ", . "
<br />"~ , ~ .
<br />'. .: ~ . . I.; l ,. ",
<br />. ,'~., Lcd/l:e'pole Creek. - North of 'llurn~, WY<l!1li~I(,j;hi <:~~:sj(
<br />dis,chai-ge was estimated: a,t S~OOO Oof.h . . Att,hfl gag,ing;, stll,tj.'b,ri., ~:t
<br />Bushnell,' Wy6mirig,''a'OTe'st stage of 7.2' feet,Bolld. :3.,340 'c.,r;s. "in:dlcated
<br />discharge occurred at 12 :30' 'p'.IIi-.', 7 SepUemb'er,. ,:' " . ,,: ':', ''''" '
<br />" . . ,< :. ~.
<br />
<br />t. Muddy Creek.- The peak flow on the North Branch of
<br />Muddy Creek near Burns, Wyoming, as determined by slopeearea measl.lre-
<br />menta, was about 4,000 c.f.s. Similar measurements on Muddy Creek
<br />near Egbert and at Pine Bll.lffs, Wyoming, indicate peak flows at
<br />these points of 6,9,00 c.f.s. and 10,000 o.f.s., respeotively.
<br />r: .~
<br />
<br />27
<br />
|