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. 
