IRRIGATION 



257 



with perfect freedom and uniformity. The miner's inch 

 is also used, especially in regions where miners have 

 become accustomed to distributing water to be used in 

 mining. The miner's inch is the amount of water which 



will flow through a square inch of opening in a second 

 with the water held at a given height above the open- 

 ing. The exact conditions for measurement are defined 



