GATE STRUCTURES FOR IRRIGATION CANALS. 



25 



to a " V " notch, and the opening finally is closed completely when 

 the slides lap each other to the extent of 3 inches. As the weir 

 is shortened the discharge increases over the formula discharge as 

 soon as the depth exceeds about one-fourth the length. 



The stationary weir plate A is bolted into the concrete wall of 

 the box and extends 3 inches inside the edge of the concrete at both 



r" 



„ V2 hole-- 

 /8 Eye Bolt- 

 '/2" Locking Pi 

 V" 

 Vs'lve Bolt 

 /?/ ve 'fed, 

 Head Counter- , 

 sunk ' 



DetaiP Of Locking Device, Adjustable Weir Wings and Gui 



I"- Vi 



section 



Fig. 4. — Three-way division box of Consolidated Lower Boulder Reservoir & Ditch Co., 



Colorado. 



sides and at the bottom. Bolted to the wall and extending across 

 the box are two guides — B-B — formed of pieces of wrought iron, 

 the upper one 7 feet 1 inch long and the lower 6 feet 4 inches long. 

 Each is 2 inches wide and one-quarter inch thick. The guideways 

 are formed by riveting the above pieces to a filler piece of wrought 

 iron of the same length as B-B, but 1 inch wide and one-half inch 

 45613°— Bull. 115—14 1 



