1088 



THE IRKIGATION AGE. 



A PERFECT FLUME AT A REASONABLE PRICE 



f^\UR Corrugated Galvanized Metal Flumes, made only in 

 ^^ gauges, 12, 14, 16, are practical, reasonable in price and good 

 for a lifetime. Made in all sizes and shipped in sections as long 

 as 22 feet. Sections connected at place of use. No solder. No 

 leaks. If you want the best flume made if you are not sat- 

 isfied with leaky, wooden flumes, write us. The accompanying 

 letter is from the man who bought the above flume and relates 

 a satisfactory experience. 



The Corrugated Metal Co. 



SYRACUSE, KANS.. 



June 2, 1911 



CORRUGATED METAL CO., 



EMPORIA, KANS. 

 Gentlemen: 



The above flume is the property of the Frontier Ditch Co. of Coolidge, 

 Kans. This flume is 5 feet wide and 120 feet long with 80 feat concrete on 

 west end and 30 feet concrete on east end. It is carried on a steel truss 

 over a creek. It does not leak a drop and was easily set up. We have had a 

 wooden flume over this creek for fifteen years and lost one-third of the water. 

 This complete job cost $1,600.00 and is absolutely satisfactory. Anything 

 you wish to refer to me will receive my O. K. Yours truly, 



PAUL RICH. 



Emporia, Kans. 



Prevention of 

 Under Scour 



on 



Soft Bottom 



It is'the good fortune of thisjcompany to get about alt the hydraulic work involving difficult foundations. To illustrate one of our methods of 

 dealing with this problem we think it worth while to introduce a perspective line out of the dam built by us last year for the Consumers Power Co. on 

 the Blue Earth River, near Rapidan, Minn. 



The bottom of the river was of indurated sand, sufficiently non-porous in character with any amount of weight carrying capacity but capable of 

 rapid erosion under any overfall, however slight. The banks on both sides were of rotten sand-stone with the bedding seams deeply weathered in 

 most places. 



A cut-off trench averaging 16 feet in depth was carried down into the indurated sand at the upstream edge of the dam across the whole width 

 of the river and up each bank along the line of intersection of the deck. This when filled with concrete effectually prevented any percolation of water 

 through the river bed itself. 



The railway of the dam is 60' above water line and the nappe is carried on a full apron with ogee curves, which substantially merged into a 

 horizontal tumbling hearth extended 54 feet below the toe of the dam as indicated. The tumbling hearth and the apron were stepped up in rather an 

 interesting manner to protect the soft banks on the south side of the river as shown at the left of the cut. Four sluice gates were set in the deck of 

 the dam at the bottom and were operated from the interior of the dam in our usual way. The discharge from these gates is at the level of the tum- 

 bling hearth as indicated by the shaded openings. A highway bridge was carried across the dam from which a series of Tainter gates are operated for 

 the close control of the water level. 



A long experience in this class of work has enabled us to determine very closely the proper extension of the tumbling hearth below the dam under 

 the conditions of minimum flood to be expected. It is so proportioned that the under roll of the standing wave shall all take place on the concrete 

 hearth, and the river will resume substantially its normal flow when it re-enters its natural bed. In this instance the width of the tumbling hearth is 

 54 feet as stated, but on our Bassano dam on the Bow River, Alberta, the width is 76 feet. This is made necessary to provide for the occasional floods of 

 about 100,000 second feet which arerecorded for that river. In the csse of the Bassano dam the foundations are 15' of clay overlaying ordinary sand 

 to an unknown depth. There is no rock of any character in that section of the country. 



Having built twenty-four dams on soft foundations, one of which was on a virtual quicksand, compelling us to use baled hay as a mattress under 

 the floor of the dam, we feel that our experience in difficult foundations has covered an unusual range. Very respectfully, 



AMBURSEN HYDRAULIC CONSTRUCTION CO., 



ENGINEER 

 CONSTRUCTORS 



Pearl St., Boston, Mass. 



All inquires from Canada should be addressed to Ambursen Hydraulic Construction Co. of Canada, 405 Dorchester St., West Montreal, P. Q. 



When writing to advertisers please mention The Irrigation Age. 



