DUTY AND MKASUREMKNT OP WATER. 



151 



receiving a definite quantity from the main ditch. 

 The method of measurement gaining in favor in the 

 west is by means of a hydrometric flume. One of the 

 most ingenious and satisfa(5tory for use on small dis- 



FIG. 41 — FOOTE S MEASURING FLUME. 



tributaries is that invented by Mr. Foote. The chief 

 fault of this apparatus is the fadl that it measures 

 water by the inch instead of by the second foot. This 

 unit of graduation can of course be changed. Its 

 merit consists in the circumstance that it renders it 

 possible to maintain very nearly a standard head, as 

 shown in Fig. 41 . It consists of a flume placed in 

 the main lateral (A), and a side flume (B), in which 



