UNITED STATES DEPARTMENT OP AGRICULTURE 
BULLETIN No. 831 
Contribution from the Bureau of Public Roads 
THOMAS H. MacDONALD. Chief 
Washington, D. C. 
PROFESSIONAL PAPER 
August 25, 1920 
SPILLWAYS FOR RESERVOIRS 
AND CANALS 
By 
A. T. MITCHELSON, Senior Irrigation Engineer 
CONTENTS 
Spillways 1 
Overflow Spillways 4 
Spillway Control 9 
Flashboards .11 
Sliding Gates . . . . . . . . . 11 
Tilting Counterweighted Gates . .12 
Rolling 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 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1920 
