IRRIGATION FARMING. 



Sand Gates. Quite as essential as the main gate 

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



FIG. 12. TOP SECTIONAL VIEW OF LAND'S SAND GATE. 



sand or detritus may be caught and drawn off at the 

 head works without flowing into and filling up the bot- 



FIG. 13. SIDE VIEW OF SAND GATE. 



torn of the canal proper. Many devices have been in- 

 vented in the hope of diverting sand from a ditch, and 

 I 



i.i.;.| 



FIG. 14. FRONT VIEW OF BAND OATB. 



the best of these no doubt is Gordon Land's sand gate, 

 sectional plans of which are presented in Figures 12, 13 

 and 14. 



