GATE STRUCTURES FOR IRRIGATION CANALS. 



37 



Most of these gates are not calibrated nor is any attempt now made 

 to use a standard formula for discharge through them, as the silt 

 changes conditions quite rapidly, but current-meter measurements in 



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the canals below the gates, in some cases made several times a day, 

 are made the basis of the charge for water against the mutual com- 

 panies. 



