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<br />34 THE ARKANSAS RIVER FLOOD OF JUNE 3-5, 1921.
<br />
<br />.Although little if any of the St. Charles drainage basin lies within
<br />the area of intensest rainfall, 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 1 a. m. June 4 and lasted for
<br />an hour. From measurements of cross section and slope this dis-
<br />charge was estimated to be 71,800 second-feet.
<br />
<br />Esti.mated discllar'uc of St. Cll(lrlc,~ Ri-vcr, .lune 3-7, 1921.
<br />
<br />TimEl.
<br />
<br />Sla!:e.
<br />
<br />Approxi-
<br />mate
<br />discharge,
<br />
<br />J~ne 3, HlO p, m,.. 0...........,. 0....0....... lIelore 1100d.... oo........... no..... 0.... ...1 S~,'fl, 50
<br />
<br />J ne 4, 1.10 a.m. ...........0 ..0... ,..... ..... Cresl....................... ..0.., ...0,. 0....1 71,800
<br />I 2,30a.mo ... ... ..0.,....., .0..,. " .0.. SlIghlly below cresl.......o .....,.0.........1 60,000
<br />4,00 a.m....,...............,.o, ..0..0 3leol below crest....... ,..,......... ..0'.00. 34,000
<br />9,00 a.m. ..0... .....0 ..0... .., ....0... Gle.t below crest..........o.. 0............ ..! 7,500
<br />G.OOp.m..., ......... ............ ...oo 8le.t b.low crest..... 0 ....0........0........1 4,000
<br />
<br />8030p. moo. ..........., .... ...... ..... Slarted torise...~ ........ ....,....... ....... ............
<br />
<br />:::::: ~~~g!I:.~~~~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~ ~ ~ ~ ~ ~ ~ ~~ ~ ~ ~ ~ ;!~: ~;; ~ ~ ~ ~; ~ ~; ~ ~ ~ ~ ~~ ~~ ~~ ~ ~ ~ ~ ~: ~: ~ ~ ~~ ~ ~ ~ ~: ~ ~ ~ ~ ~:I ~m
<br />
<br />Jun. 7, Noon.. ........., .... .............. ...j....... ..0.., 0....... ...... ....,.... ..0. 0.....\ 350
<br />
<br />The total discharge was about 60,000 acre-feet.
<br />
<br />CHICO CREEK.
<br />
<br />The area drained by Chico Creek joins that of Fountain Creek
<br />on the 'west. Chico Creek rises in the central part of El Paso
<br />County, Hi miles east of Co lorn do ~[>rings, and flows southward to the
<br />Arkansas, which it joins l'l miles east of Pueblo. Its principal
<br />tributary, Black Squirrel Creek, ('nters Chico Creek a few miles
<br />above the mouth. Throughout t.he upper half of its course the
<br />creek has an average fall of ()i) feet to the mile; in the lower half
<br />the fall is 29 feet to the mile. The drainage basin lies wh.olly 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.
<br />
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