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<br />34 THE ARKANSAS RIVER FLOOD OF JUNE 3-5, 1921.
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<br />
<br />Although l~ttle if any ~f the StAJharles drainage l?asin lies within .
<br />the area of mtensest ramfall, it was subject to very heavy rain .
<br />which began during the evening of June 3, and lasted through th~
<br />night. The crest flow occurred about la. m. June 4 and lasted for
<br />an hour. From measurements of cross section and slope this dis-
<br />charge w~s estimated to be 71,800 second-feet.
<br />
<br />Elltimated dillcha.rgc of St. Cltarlc~ Rivcr, ,Tt'n6 3-7, 1921.
<br />
<br />.
<br />
<br />Time.
<br />
<br />Stage.
<br />
<br />Approxi.
<br />mate
<br />discharge,
<br />
<br />J,ne 3, 4.00 p. m... ....,. .., .:... '.,....... .., Berore tlOO<l...... ...... ,.. .....,....... .,... Su;,-fl. 50
<br />Jane 4, 1.10 a.m..... ,.." ." ,. ..,..... ..,...' Cr..t................, '..., ". .,., ..,..... ,.. 11,800
<br />I 2.30 a.m. .....,......"........,.. ,..' Slightly below .r..t... ..". .... ....,.' ,."" 80,000
<br />4.00 a.m......"..... '........,....... 3 reet ~Iow crest........... .,... ..,...",...1 34,000
<br />9.ooa.m.....,.,.......".....,......, Sr..tbelow.r..t.....,..,...... ,.., . I 7500
<br />
<br />s.llOp.m......... ...... ..",... ...".. 8 reet ~Iow crest.....,....,..... :.,.. ..., ., 4' 000
<br />8-30 p. m...,............,..,. ,....,.., Started to rise,..:"...........,:,.... ...,.,.. . ,
<br />1 5 800 .,.. . ............
<br />une , .. a.m........................................ .......................................................1 1,000
<br />, . ~.fl~::::::::::::::::::::::::::::::C::::::::::::::::::::::::::::::::::::::::::: 1 ~
<br />Jane 8, 6.00 p. m......., '" .......,.,... .......1. ...., ,.. ,.....','...,....,.. ,..",...,..., "'\ ~OOO
<br />June 7, Noon.. ......,....,. .....".., ....,..+ ........ ..., ..'.., ........ ,.,'........ ..,.... 350
<br />
<br />The total dlscharge was ahout 80,000 acr...reet.
<br />mnco CREEK. .
<br />
<br />The area drained by Chico Creek joins that of Fountain Creek
<br />on the 'west. Chico Creek rises in the centml part of EI Paso
<br />County, H; miles east of ,Colorado Springs, and flows sOl1thwnrd to the
<br />Arkansas, which it joins l'l: miles cast of Pueblo. Its principal
<br />tributary, Black Squirrel Cn:l'k, enlers Chico Creek a few miles
<br />above the mouth. Throughout the nppcr half of its course the
<br />creek has an average fall of 65 feet to the mile; in the lower half
<br />the fall is 29 feet to the mile. The drninage basin lies wholly within
<br />the area of the Great Plains and has a rolling topography. On ac-
<br />count of the small normal rainfall, Chico Creek carries little water
<br />except after heavy rains, The total drainage area is 750 square
<br />miles.
<br />No information regarding rainfall in this basin during the flood
<br />is available, but as Chico Creek drains an area adjacent to that of
<br />Fountain Creek the general storm probably extended over its basin
<br />also.
<br />The State engineer's office measured the cross section and slope of
<br />Chico Creek' near the mouth and determined the crest discharge to .
<br />be 28,600 second-feet.
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