Bui. 376, U. S. Dept of Agriculture. 



Plate XII. 



Fig. 1.— Typical Outlet Structure. Will Partially Recover Velocity Head. 

 Pipe is one-half diameter too high for inlet structure. Too much air would enter. 



Fig. 2.— View Taken from Structure in Figure 3. 

 Hillside cut ravelings enter pipe and reduce capacity. A condition to be avoided. 







ar* 



,V, " " 



j^^^^tx 





r 



r 



i 





A 





^ M 



m 



- M 



Fig. 3.— Entrance well Submerged, Reducing Amount of Air Carried into Pipe. 



