74 



IRRIGATION FARMING. 



stream. The head gate is located a short distance 

 lower down the canal, as in the case of bulkheads. 



FIG. 13 — TOP SECTIONAL VIEW OF LAND S SAND GATE. 



FIG. 14 — SIDE VIEW OF SAND GATE. 



FIG. 15 — FRONT VIEW OF SAND GATE. 



Sand Gates. — Quite as essential as the main gate 

 itself is the sand gate of a canal, by means of which 

 silt, sand or detritus may be caught and drawn off 



