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<br />. <br /> <br />112 CONTRIBUTIONS TO HYDROLOGY OF UNITED STATES, 1923-1924. <br /> <br />highest stage at Thermopolis, because the water was over each end <br />of the bridg~, but from high-water marks, levels run to de'termine <br />the overflow area, and statements of citizens a hydrograph showing <br />the entire flood discharge has been prepared (fig. 10). At 6 p. m, <br />July 23 the river started to rise, and by 2 a. m. July 24 it was dis- <br />charging 24,800 second-feet, It- then fen rapidly until 8 a. m" <br />when the discharge was 15,000 second-feet, A second rise began at <br />that time and continued until 11 p. m" when the maximum diScharge <br />of 29,800 second-feet was reached at a stage of 16,2 feet above the zero <br />of the gage. _ From the peak, which was of relatively short duration, <br />the discharge fell to 22,300 second-feet at 8 a. m. July 26 and to <br />14,500 second-feet at midnight on the 27th. A slight rise occurred <br />during that night, but after that time the river fell steadily until <br /> <br />'""" <br /> <br />. \ . <br /> I <br /> i\ . . \ <br /> . <br /> \ <br /> I\. <br /> " 1\ <br /> I'\. <br />~ JULV 2'-~ "-... I}n -To' <br />" - r\. <br /> <br />"'00 <br />~ <br />w <br />w <br />~ <br />o <br />~'"'" <br />.W <br />W <br />?; <br />bi15,OOQ <br />~ <br />% <br />ill <br />",- <br /> <br />5,000 Julyn:; !!:~ Zl) '27 28 ~, ~o II ~.pt;..?& Z7 ~e ;1:, ~ Q!&I <br />FlG'OU lO.-Hydrograpbs of fioods in 1m OD lUg Hom River at Tbermopolis, Wyo. <br /> <br />the discharge was 8,000 second-feet on July 31. During this period a <br />total of 235,000 acre-feet passed Thermopolis. <br />The fust rise was undoubtedly caused by a cloudburst in.Red Can- <br />yon, a small tributary that enters Big Horn River a few miles above <br />Thermopolis. The flood was so severe on this tributary that it <br />washed out the railroad bridge and several hundred feet of track. <br />A study of the time at which the tributaries were at crest stage in- <br />dicates that the chief source of the main flood was the .crest floWs <br />from Badwater and J!v.[uddy creeks and, to a lesser extent, from <br />Muskrat, Fivemile, Poison, and Tough creeks. Wind River did not <br />reach its maximiun stage at Riverton until 4 a. m. July 25, and as <br />this point is 64 miles above Ther:riJ.opolis by river, it took at least <br />12 hours for this peak to reach Thermopolis. If the Wmd River <br />crest had coincided with the others the discharge at Thermopolis <br />would have increased by at least 5,000 second-feet. <br /> <br />- <br />