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months which decide the summer contingent of the White Nile to the 
Nile in Egypt during the months of April, May, June and July. 
The shores of Lake Albert are generally steep and barren, though 
in places they are shelving and covered with papyrus, notably at the 
inlets of the Semliki river and the Victoria Nile. The Lake is fairly 
deep and admirably suited for a reservoir. At the outlet of the lake 
enormous quantities of pistea weeds, especially in high floods, enter 
the Albert Nile. The passage of these weeds through the future 
regulator of Lake Albert will be an exceedingly interesting engineering 
problem. 
The principal feeders of the lake are : — 
On the north, the Victoria Nile. 
On the east, the Waiga, the Wakki, the Hoima, the Wahamba, the 
Horo, the Ngusi and Msisi, discharging between them under 
20 cubic metres per second in the dry season, though good 
streams in flood. 
On the south, the Semliki ; and no streams worth mentioning on 
the west. 
13.— The Albert Nile. — The Albert Nile, or the Bahr-el-Gfebel, has 
a length of 1280 kilometres from Lake Albert to the mouth of the 
Sobat river. For 218 kilometres, past Wadelai to Dufile, it has a 
broad stream with a sluggish current as a rule, and covered with islands 
and papyrus marshes. This reach of the Nile is navigable. The fall 
here must be very little, and it may be considered as 8 metres. In 
high floods enormous quantities of pistea weeds float down this reach 
of the Nile. Papyrus and ambatch are very common along the 
shores and on the islands. 
At Dufile begin the Fola rapids followed by numerous cataracts up to 
Fort Berkeley. In this reach of 155 kilometres the river falls 223 metres. 
Sir William Gars tin states that some of the falls have a width of only 
12 metres. The depth must be extraordinary, while the velocity is 
terrific. The green water of the upper reaches is purified in its 
passage through these cataracts. The rock is granite. If the regulator 
for Lake Albert were constructed near Dufile, it ' should contemplate 
development of electricity for working a railway along these 155 kilo- 
metres. 
South of Dufile the principal tributaries of the Albert Nile are on 
the right bank viz : the Achua and Umi. In the dry season they are 
dry, but after rains they may add some 50 cubic metres per second to 
