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 
