This research was conducted in Nekemte area which is bounded in 36o 30’ to 36o 40’ longitude 
and 9o 05’ to 9o 10’ latitude of western Ethiopia, for quantifying of the aquifer properties depending on 
the pumping test data as there is limited information on groundwater distribution. The study area was 
comprises different units like clay sediments, weathered and fractured basalt, and other quaternary 
sediments; and geological structures causes for different landforms and for primary and secondary 
permeability and porosity which are plays great role on the aquifer properties. For the achievement of the 
objectives the data of water bearing horizon, location depth of aquifer, analyze the draw down, discharge 
rate and pumping duration data, and characterize according to the given data were collected from 
geological field activities to fulfill the gaps in hydro geological field observation data recording and 
borehole depth to groundwater, and well completion reports. The discussed result indicates the type of 
aquifer is confined aquifer with confining layer clay from the top and weathered basalt from below and 
the pumping test data with maximum and minimum transmissivity of T=9.8*10-4m2/s and T=3.43*10- 
4m2/s, respectively, and average transmissivity of T=6.6*10-4m2/s was indicates the heterogeneity of the 
aquifer materials. From this the transmissivity and hydraulic conductivity vary laterally with in 
formations, and the property of aquifer it can be inferred that the specific capacity of aquifer is high, but 
its transmissivity is negligible since porosity is less interconnected.

Characterization of Aquifer System of Different Geological Formations is Based On PDF

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