— 82 — 
In 1861 the discharge at Gondokoro was as low as 500 cubic metres 
per second. It will be seen that, in spite of the great waste, there is 
an increase at the northern end of the Sudd region even under present 
conditions when the discharge at the south end is increased in the 
interval between the 15th January and 15th May. The water which 
enters the White Nile during these months represents the summer 
contingent of the White Nile to the Nile in Egypt. 
N ow though an increase in April at the south end of the Sudd region 
is felt at the north end, no such increase is felt in September and 
October, and the reason has been given in Chapters II and III. 
In April the Sobat river is discharging practically nothing, and 
the whole supply available in the Albert Nile can pass down the White 
Nile past the Sobat mouth. In September the Sobat river may be 
discharging 750 to 1,000 cubic metres per second, and as the White 
Nile cannot discharge the combined waters of the two rivers, the water 
of the Albert Nile is headed up and accumulated in the lowlands 
between Lake No and the Sobat mouth. This is greatly to the ad- 
vantage of Egypt, for it is the discharge at the head of the White Nile 
between January 15 and May 15 which decides the White Nile contin- 
gent to the summer supply of the Nile in Egypt, and the greater the 
quantity of water above the head of the White Nile, in the absence of 
a regulator or barrage at Wadelai or Dufile, the better the summer 
supply of Egypt. After the abnormally high flood of 1878, when 
Gordon was up the Nile, so great was the accumulation that the dis- 
charge at Assuan never fell below 1500 cubic metres per second in the 
summer of 1879. The Barrage was not regulated upon and yet all 
the Lower Egypt canals were full of water, and the cotton crop of 
Egypt for that year was quite abnormal for the seventies of the last 
century. 
Now an expenditure of between £400,000 and £1,000,000, say 
£800,000, could secure a regulator for Lake Albert at any point 
between the outlet and Dufile. Such a regulator would insure 1 200 cubic 
metres per second every year to the Albert Nile at Gondokoro between 
the 15th January and the 15th May. With this supply insured, the 
training works in the Sudd region would soon begin to affect the 
discharge at the north end of this region where the White Nile begins. 
The way in which this work of training should be carried out has 
been admirably laid down in page 174 of Sir William Gars tin’s Report. 
“Alter the flood conditions of the Albert Nile (Bahr-el-Gebel) as little 
