254 



FARM DEVELOPMENT 



agent allows to flow into the supply ditch of a farmer. 

 By means of the wheel and screw-rod the gate can be 

 raised to allow a given amount of water to pass through. 

 The arm-nut with chain attached can be so placed on 

 the screw-rod as to allow only the allotted amount of 



water to pass under 

 the gate, and with pad- 

 lock it can be locked so 

 that no one can ope;: 

 the gate wider. In 

 Figure 148 is shown a 

 form of division box by 

 means of which part 

 or all of the water can 

 be taken from a main 

 ditch and distributed to 

 the ditches either side. 

 The gates, usually 

 made of 2 x 4-inch 

 uprights and 2-inch 

 planks, can be so ad- 

 justed as to permit the 

 desired amount of 

 water to flow through 

 them. In case of ditches 

 which carry water to a 

 number of users, each 



Figure 150. Head gate used for regulating and meas- of wllOm is entitled tO 

 uring water from company ditch to farmer's ditch. 



a share, the openings 



in the gates are adjusted to measure the water supplied 

 through the four laterals, that each may receive his pro- 

 portionate share. 



The measuring weir, usually placed in the ditch just 

 below the head gate, is a very simple device, by means 

 of which the amount of water running through the ditch 

 can be measured. Thus the corporate company or the 



