434 



IRRIGATION PRACTICE 



FIG. 152. Utah lay-off and pulverizer. 



soils that "wash" easily, lath boxes, already mentioned, 

 or pipes are often used. (Fig. 137, 138.) 



In constructing ditches it is usually sufficient to step 

 off the distances, and any simple leveling device gives the 

 necessary levels. (Fig. 139.) 



255. Gates and checks. Gates for the admission of 

 water from the supply ditches into the laterals may be 



FiQ. 153. Robinson's adjustable corrugator and renovator. 



