— 25 — 
they were 12,500, 12,100 and 10,300 cubic metres per second respect- 
ively, while for a mean year they are 8,500, 9,200 and 7,200 cubic 
metres per second. 
The modulus of the river at Assuan is 3,040 cubic metres per second, 
and at Cairo 2,640. After the very high flood of 1878, the lowest 
discharge in May 1879 at Assuan was 1,500 cubic metres per second. 
The behaviour of the Nile after passing Assuan and entering Egypt 
may be described as follows: — of the mean discharge of 3,040 cubic 
metres per second which passes Assuan 400 cubic metres per second are 
utilised in Upper Egypt in the irrigation of 2,320,000 acres and 2,640 
cubic metres per second pass Cairo. Of these again 540 cubic metres 
per second are utilised in the irrigation of 3,430,000 acres in Lower 
Egypt, and only 2,100 cubic metres per second reach the Mediter- 
ranean sea. 
