U. S. Dept. of Agr., Bui. 130, Office of Expt. Stations. Irrigation Investigations. 



Plate X. 



SCALE OF MILES 



HUM ^SHfe/^ 



■vi-wj^ -^^11^ js,\l»<i* 13 PYRAMIDS OF GIZ£H 



Map of the Nile Valley from Cairo to the Delta, Showing the Location of 

 THE Barrages and the Head Works o" the Principal Canals. 



