340 IRRIGATION PRACTICE 



Ganges delta, the average annual rainfall varies from 60 

 to 70 inches, whereas over the Northwest Provinces it is 

 in the neighborhood of 25 inches. 



The duty of water in India has been investigated under 

 government supervision, and much has been published 



FIG. 94. Headgate of a canal. 



concerning it. R. B. Buckley, the chief authority on 

 East Indian irrigation, states that the gross duty of water 

 during the wet season from June to October varies 

 from about 80 to 170 acres to the second-foot. During 

 the cold season from November to March the duty of 

 water varies from about 90 to 200 acres to the second-foot 

 of water. The duty of water varies greatly, even under 

 the same canal, if different sections are considered. In 

 India, as elsewhere, it seems to be true that the more 



