IRR1GA TION AND DJtA /JT 1 (,' /;. 



159 



capacity need not greatly exceed 25 cubic metres per feddan 

 per 24 hours. It will probably run nearly the whole 

 24 hours, and only be shut down a few hours during the 

 night. The little canal for 50 feddans must do its work 

 in daylight usually, although during rotations and in 

 moonlight the fellaheen attend to the water throughout 

 the night. 



The following diagrams show types of agricultural 

 canals. 



A 



; 



100. 



SCALE 



FIG. 49. DIAGRAMS SHOWING TYPES OF AGRICULTURAL CANALS. 

 A for 5U, B for 500, C for 5000 feddans 



These canals embody the results of much practical ex- 

 perience. In canal A, the banks are too small and weak, 

 but a little channel like that is constantly being cleaned 

 and the banks gradually strengthened. It is sometimes 



