Bui. 854, U. S. Dept. of Agriculture. 



PLATE III. 



P. R. D-537 



P. R. D-691 



Fig. I.— Conical Entrance Used to 

 I ncrease Entrance Velocity I nto 

 Tile. 



Fig. 3— Weir with 90-Degree Notch, 



Note free fall from discharge tank. 



