USE OF CONCRETE PIPE IN IRRIGATION. 



41 



On the other hand, such devices may not measure water accurately 

 particularly in reduced volumes. They are also liable to become 

 clogged with silt, sand, moss, or other debris. Figure 19 shows the 

 exterior of one of these meters. 



Fig. 18.— Miner's inch box fitted with long waste overflow to minimize change of head 

 through miner's inch plates that feed lateral pipes. 



DIVERSION BOXES. 



As stated, weirs, miner's inch boxes, and recording devices are 

 usually set in boxes which also act as diversion boxes. Some of the 

 larger rectangular boxes in use have a weir or miner's inch plate 

 on each side and divert water to three or four laterals, as illustrated 

 in figure 20. 



It is common practice to measure water at the upper end of a 

 lateral and then install simple diversion boxes at each orchard or 

 farm. These seldom measure water, but are designed so that all 



