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EFFECT OF RESERVOIRS ON THE FLOOD. 17 the east end of the dam, and the discharge was led away from the toe of the embankment by a canal constructed for that purpose.. Mr. C. E. White, superintendent of the water division of the Beaver Park Irrigation Co., gave the following account of the fail- ure of the reservoir (see PI. III, A) ; The storm of June 3 began at Ule reservoir about 7 p. m. At that time the water In the reservoir stood 7 feet below the spillway level. 13y 4.30 a. m. June 4 the run-of! abo\'e the reservoir tilled the reservoir and the water began to run over the spillway. By 7.30 n. m. Ule spillway was discharging 1,500 second-feet, and In addition the large ouUet gat~ was opened halfway. At 5.30 p. m. the water flowing over the Spillway had faUen 9 inches, and It was be- Ueved the 1I00d had been successfully passed. Two hours later, at 7.30 p. m. June 4, the water flowing o-rer the spillway began to rise agaln and continued to rise at the l'.te of 3 inches an bour. At this time the large outlet gate was oppnrU will", as was also a by-pass gate bavlng a capacity of sa second-feet. 'rhe w"t,'r dropped sllghU)' about 9.30 a. Ill. .June 5. and shortIy afterward the water appear",! to give a surge Ilnd overtopped the dam for about 75 feet along Its .wlddle sectIon. At this time the water flowing over the spillway was 41- feet deep. The dam failed SOOn afterward, belng almost entirely washed oat, and In 30 minutes' tIwe the reservoir was empty. By the failure of the Schaeffer dam about 3,600 acre-feet of water was released into Beaver Creek within 30 minutes. This resulted in a veritable wall of water rushing down Beaver Creek and causing a flood in Arkansas River. The sudden rush of water down the Ar- kansas swept all before it for severnl miles, or until the natural stor- age of the river channel reduced the peak. The greatest damage was, caused near Swallows, where several buildings and all freight cars stand~g on side tracks were washed away. The following table shows the time the flood was observed at several points between the reservoir and Pueblo: Observea time of flood. of June 5. 1921, at several points between Schaeffer reserVOir ana Plleblo.G Point oC omen-atlon. Distance Tim.. below reservoir. .Jllilu. o 9 19 29 :H Reservoir.............o ........ .............. ......0.. --........ .... ..... ._...._ g.30.a. m. ... Youth of Beaver Creek... ..... .... .... ........... ....... ............ ........ ........... 10.45 a. m.... ~=~~.::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::/ ~~g:::'::: -Data (nmished chiefly by )ofr. Arthur 0.. Ridgway. The distance of 9 miles down Beaver Creek was covered in H hours, an averacre of 7.2 miles an hour. Down the Arkansas the flood '" . Colorado State Engineer Fifteenth Bleno. Rept.? p. 122, 1911. 841580-22-2