26 BULLETIN 115, U. S. DEPARTMENT OF AGRICULTURE. 



thick. The rivets are countersunk on the side coming against the 

 concrete. 



The gate shutters or slides are 16f inches high and 21 inches long, 

 the back end being cut parallel to the front end. Near the top of 

 these shutter pieces is bored a series of holes five-eighths inch in 

 diameter. These holes come just under the lower edge of the upper 

 guide and pass corresponding holes of the same size in the stationary 

 plate. Either slide is locked in any desired position by passing a 

 pin through the proper hole in the slide and fastening it there, as 

 shown in the drawing. This forms a positive locking device, and 

 the slide can be moved only under action of the key. If the ditch 

 regulations on a system desiring to adopt such a device as. this are 

 such that the consumer is allowed to open his gate to a certain point, 

 determined by the lock, but can close it at will, a modification of the 

 structure may be effected as follows : 



Cast two flashboard grooves in the side walls of the outlets below 

 each weir so that boards inserted therein will close up the opening 

 leading from the weir. By adjusting these the consumer can close 

 out any part of the water and yet he can not take water to exceed the 

 capacity of the locked weir. Of course it is to be understood that any 

 gate which allows the consumer to turn water back into the ditch 

 causes that much more water to come against- the succeeding gates, 

 with an increase in the discharge through these other gates. If flash- 

 boards are undesirable then a simple wooden slide gate may be made 

 to fit the grooves: 



This construction as installed by the company, made under force 

 account, costs about $8 per cubic yard for concrete of a 1:3:5 mix- 

 ture of cement, sand, and river gravel. Cement costs $1.85 per barrel. 

 A structure with 3-foot weirs costs about $32, while one with 4-foot 

 weirs costs about $40. These prices include the shutters and locking 

 devices. 



WOODEN DIVISION BOX, MONTANA. 



In parts of Montana the division box shown in figure 5 is used to 

 turn all or any part of the water in one small ditch into a head ditch 

 or field lateral leading from the supply ditch. In the gate shown 

 2-inch material is used for the most part, but in sections of the West 

 where redwood is available 1-inch stuff would do almost as well for 

 the flashboards, sides, bottom, wings, and cut-offs, using 2 by 4 inch 

 redwood or Oregon pine for the posts, sills, and caps. If it is not 

 desirable to use flashboards one of the simple wooden shutters shown 

 in Plate I may be adapted to fit. The gate shown is for a one-way 

 division from the supply. For a two-way division the structure is 

 made symmetrical, both deliveries being made like the one delivery 

 shown. 



