Groundwater Flow System and Hydrochemistry of Ziway-Koka Corridor in the Main Ethiopian Rift
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Date
2007-02
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Addis Ababa University
Abstract
The studied corridor, part of the Main Ethiopian Rift, has been delineated so as to
include eastern and western escarpment, floor of the rift, and the Lakes Ziway & Koka
Dam. All of which has the total aerial coverage of almost 6000 sq. Km.
Geological coverage of the studied area is dominated by Lacustrine deposit at the floor
of the rift, which is followed by other sub formation.
Integrated methodology and approaches are conducted to observe the groundwater flow
system and to determine hydrochemistry (water potablity) of the corridor. Both of which
are interrelated each other and brought the same output.
Groundwater flow system are considered as shallow and deep aquifer cases and the
output indicate that the existence of flows in a separate way in the two systems. For the
deeper case, groundwater migrates from southern to northern part of the study corridor
which is disproving/ rejecting the previous work. For the shallower case, groundwater
migrates from north western to south eastern of the corridor.
Hydrochemical data shows: evolution of major ions, water types, potablity of water for
human consumption, fluoride lateral & vertical distribution, which is the main problem
in the Ethiopian Rift, and direction of groundwater flow.
Graphical presentations of the physical and chemical parameters of the water samples
provide a good deal of information on the characteristics of ground water flow systems,
recharge and discharge zones, and evolution of major ions in the corridor.
Abiyu K. Groundwater Flow & Hydro chemistry of Taxiway-Kora Corridor A
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Groundwater Flow & Hydro chemistry of Taxiway-Kora Corridor