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it to give. The maximum water we have to deal with is zero in summer 
and 40 cubic metres per second in flood. If the Albert Nile were 
separated from the Gazelle, it might be found that the waters of the 
Gazelle river found their way into the Albert Nile through that myster- 
ious and unsatisfactory river the Lolle. Some use might even be 
found for it. I have, since I wrote this, been informed by Capt. Lyons 
that Marno in 1881 proposed this cut round the south-east corner of 
Lake No. (Pet. Mitheil, 1881, page 425 and plate 20). 
The Albert Nile to-day at Hillet-el-Nuer is capable of carrying 450 
cubic metres per second. North of Hillet-el-Nuer, the Albert Nile has 
a mean width of 7 5 metres, but owing to want of training and papyrus 
swamps, the discharge dwindles down to 320 cubic metres per second. 
The Albert Nile has in this reach a very good section indeed and by 
beginning with the west bank and dredging round corners and closing 
spills by dredged earth, an improvement of section and slope, backed 
up by a permanent discharge of 450 cubic metres per second at Hillet- 
el-Nuer, might speedily result in this very discharge of 450 cubic 
metres per second being obtained south of Lake No. We are here in 
such swamped land that percolation would be practically zero. There 
are only 200 kilometres of channel with all its curves, or 160 kilo- 
metres of trained channel to work at, in which 75 per cent of the 
work is to hand ; and we have to confine our attention to the low 
supply without worrying over the flood supplies. 
Now the Bahr-el-Zeraf could be made capable of carrying 150 cubic 
metres per second by an improvement of the inlet at Baker’s channel 
and by dredging north of Ghaba Shambe, as will be seen by examining 
the measured discharges of the Bahr. With the Bahr-el-Zeraf carrying 
150 cubic metres per second and the Albert Nile carrying 450 cubic metres 
per second, we should have ensured 600 cubic metres per second. As time 
went on, improvements in the channels would make themselves felt, as 
they are even doing to-day, and we might even have 700 and 800 
cubic metres per second at the head of the White Nile below the Sobat 
mouth. We must always remember that it is assumed that the lake 
Albert reservoir dam has been constructed and a supply of 1,200 cubic 
metres per second assured at Gondokoro from January to May. If 
the Sobat river were capable of regulation downstream of the Pibor 
marshes, we might get an increase from that direction as well. The 
possibility of a good site for a reservoir upstream of Nasser is very 
great. The Nasser gauge rises and falls so slowly that there must be 
