356 



IRRIGATION PRACTICE 



one containing one-third and the other two-thirds of the 

 whole stream. If the partition is placed 1J^> feet from the 

 end of the crest, the flow is divided into two equal streams. 

 This extremely simple method of dividing water seems to 

 give general satisfaction. It is frequently desirable to 

 have an adjustable divisor to divide a 

 certain stream in various ways, at 

 various times. Moreover, two or even 

 more partitions may be placed below 

 the overfall, to divide the flow into 

 several streams. (Fig. 101.) 



FIG. 101. Divisor attached to Cippoletti weir. 



Frequently, it is necessary to divert a constant quan- 

 tity of water from a large canal. For this purpose the 

 automatic weir suggested by Winsor probably gives the 

 best satisfaction. A board with a long, shallow notch in 

 it to act as a spillway is placed lengthwise in the stream 



