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<br />18 THE ARI<ANSAS mVlm ]{LOOD OF JUNE 3-6, 1921. <br /> <br />traversed a distance of 25 miles in'S! hours, an average rate of 7.1 <br />miles an hour. . <br />The maximum discharge of Beaver Creek was detennined as <br />153,000 seconll-feet at a point 1 mile nbovo its mouth. Although this <br />discharge is extremely high, it is entirely rensomble, as the mean <br />discharge requireu to empty the reservoir in 30 minute:; would have <br />been 8i,100 second-feet. (ISee PI. III, E.) <br />At Pueblo the maximum discharge of the river caused by this <br />.flood, which lasted from 3 t~ 4 p. m. on June 5, waS 31,000 second-feet. <br />Before and after the flood the discharge of the river was about 15,000 <br />I second-feet, and the difference, 16,000 second-feet, represents the fl()od . <br />I crest from Beaver Creek as it reached Pueblo. Thus in travel'SinfT 25 <br />. to <br />, miles of river that was at. medium flood stage the crest decreased <br />from 153,000 second-feet to 16,000 second-feet. . <br />The Skaguay reseryoir is formed by 1\ dam across the channel of <br />West Bea,er Creek: The dam is a steel-faced granite back-filled <br />structure, having a maximum height of 70 feet to the spillway level. <br />Its len~h is 40ii feet on the crest and 220 feet at the. base. The top <br />width is 20 feet. The steel-faced upstream slope stands at an angle <br />of 300 with the vertical, and the downstream slope at an angle of 500. <br />The spillway is 60 feet wide and is cut through granite beyond the <br />northwest end of the dam. It is divided into six parallel channels <br />by concrete and timber partitions. (See PI. IV, E.) .The .steel plates <br />are sheets measuring 5 by 15 feet and decreasing in thickness from <br />...., ....... .half an inch at the bottom to a quarte'r of.an inch at the top. Thi~ <br />':>.""':' dam successfully withstood the flood, although the water ran qver it <br />..... -:':"in the low places. To stop this overflow ilashboarcls in the spillway <br />.' ..,' .' were blown out with dynamite, and the consequent sudden release of <br />. ...\water into the channel below the dam washed out 50 feet' of wood- <br />7'::...... '.:stave pipe-line leading to the power house, 5 miles below.'. .... ". <br />: . .... "::_ ". The Teller reservoir T is formed by the construction across Turkey <br />- .... . :.... Creek of an earth dam having a maximum height of 106 feet, a crest <br />:.' :. . length of 770 feet, and a bottom length of about 500 feet. The bills <br />,:.<......:..tbat form the abutments of the clam are very Steep, and near the top <br />.: .:... . 'the dam abuts against rock cliffs at both ends. The embankment has <br />a crest width of 22 feet, an outside slope of l~ to 1, and an inside slope <br />of 3 to 1. The inner slope is protected by a reinforced-concrete pave- <br />ment 4 inches thick, anchored to the earthwork by concrete pIngs 6 <br />inches in diameter and 2 feet long, spaced 12 feet.apart. This con- <br />crete pavement is connected with a concrete toe wall. which is carrie'] <br />to bedrock across the creek bottom. Concrete cnt-off walls were also <br />provided where the embankment 'abuts a;rainst the rod, cliffs at <br />the ends. The outlet consists of II concrete tunnel 7 Teet wide and <br /> <br />.. ~ }. <br /> <br />'COloradQ Sute Engineer Fl!teenth Bhinn. Rept.. p. 110, 1911. <br />