36 



BULLETIN 831. IT. S. DEPARTMENT OF AGRICULTURE. 



The claim that the siphon spillways constructed as control devices 

 on the New York State Barge Canal were the first installations in 

 this country is undisputed. This project offered several ideal cases 

 for testing their adaptability in regulatory capacities and they were 

 utilized in several locations where other and better known structures 

 were either impracticable or impossible. Two of the three locations 



II I I I 



■4' Apron ij- necessary 



Fig. 14. — Cross section of larger size siphon spillway in battery of three. These are 

 also located at points where automatic operation is essential, and as huilt and operated 

 by the Mount Whitney Tower & Electric Co. are capable of discharging 100 cubic feet 

 per second. 



required a structure capable of disposing of the waters accumulated 

 from an intercepted drainage area and which had to be discharged 

 into an adjacent stream. Surface fluctuation was limited, so that the 

 overflow into the canal could not be in excess of the outflow and it had 

 to be discharged with rapidity equal to the inflow. The old form of 

 overpour spillway with the necessary length of crest to dispose of the 

 water within the limits of surface rise and fall was impossible in at 



