UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 831 



Contribution from the Bureau of Public Roads 

 THOMAS H. MacDONALD, Chief 



Washington, D. C. 



PROFESSIONAL PAPER 



August 25, 1920 



AND CANALS 



By 



A. T. MITCHELSON, Senior Irrigation Engineer 



CONTENTS 



Page 



Spillways ..,.1 



Overflow Spillways 4 



Spillway Control 9 



Fiashboards .11 



Sliding Gates . 11 



Tilting Counterweighted Gates 12 



Roiling Dams or Barriers 13 



Siphon Spillways 15 



U. S. Reclamation Service Siphons 28 



European Practice 31 



Huntington Lake Siphon Spillway 32 



Conclusions . 38 



Acknowledgments 40 



