SPILLWAYS FOR RESERVOIRS AND CANALS. 



17 



above to water surface below the dam. Flow through a siphon is 

 produced by the difference in the elevation of the water surface at 

 the inlet of the siphon and the elevation of the water surface at the 



*irvenK 



-3' O" -#(tf2"-»i ^Priming siphon outlet pipe 



j 14" yitrifi'ed p>p<2- incased >«. concrete- 



SECTION A-A 



T 



SECTION B-B 



PLAN of SIPHON 

 SECTION F-F 



Fig. 5. — Cross-section and section plan of siphon spillway. South San Joaquin irriga- 

 tion district, Kipon, Calif. 



outlet end ; or in case the latter is not submerged to seal the siphon, 

 and the water has a free discharge, it is measured to the center of 

 the outlet opening. In such cases the flow is treated as if it were 

 through a short tube with various forms of inlet, and further limited 

 149907°— 20 2 



