survey of the irrigation potential of the lower tana river basin kenya

- 5 -
Although it is apparent that the rate of development of irrigation is to some
extent dependent upon 'the rate of growth of the power system, this appears to he of
little practical significance, as a growing demand for power already exists. If
this demand is met by development of the hydro-electric resources of the Tana, it is
bound to provide the necessary flow control in advance of any reasonable schedule
of irrigation development which may he foreseen.
The power system envisaged would utilize to a high level the head and flow of
the middle Tana, through a complex of projects, the main features of which are summarized
in Table 2-1. The power system defined in this table does not include the
additional 131 megawatt potential that could be developed by releasing some 400
cubic feet per second (cusecs) of upstream allocations.
Project Estimated
capital cost*
Seven Forks**
Kiambere
Mutanga
Grand Falls
Adamson's Falls
Koreh
Athi Diversion
Table 2-1 - Power Development on the Middle Tana
£ E.A.
(millions)
63.91
23.70
22.12
16.39
14.77
17.58
2.12
Gross
head
ft
1,005
334
268
I85
123
177
I6O.59 2,092
Long-term
firm flow
cusecs
2,730
2,730
3,850
4,180
4,550
4,410
575
Installed
capacity
MW
320
I92
112
89
65
87
Annual
energy
production
GWh***
1,630
575
63O
494
359
479
865 4,167
* Including capitalized value of accumulated operating defioits during
development period; for load growth rate 1.
** Seven Forks development assumed as Confluence projeot to FSL 3,455 feet,
plus Kindaruina as under construction.
*** GWh - gigawatt/hour