| Article Details : |
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| | | Article Name : | | | Determination of Overburden Thickness and Depth
to Water-Bearing Strata Using Surface Geoelectric
Data in Orlu Area, Southeastern Nigeria | | Author Name : | | | EGBUACHOR, C.J., NWOZOR, K.K.
| | Publisher : | | | Bridge Center | | Article URL : |  | | | Abstract : | | | The groundwater potentials of Orlu and environs in the
southeastern region of Nigeria were studied using the vertical electrical
sounding technique. The field data acquisition utilized the
Schlumberger electrode configuration with a good spread of sounding
locations across the area. With this approach, it was possible to
determine the vertical variation and continuity of subsurface lithotypes
and probable depth that will be drilled for the successful development
of groundwater resources. Geoelectric parameters indicate the rock
types are lateritic topsoil, low resistivity layers (clay, shale), sandstone
and unconsolidated sands. The geoelectric models show that waterbearing strata range in depth from 63 m to 134 m and the resistivity of
these layers vary between 462 ohm-m and 4930 ohm-m. The study also
show that valuable construction sands and gravels constitute the
overburden materials, which can be commercially exploited to boost the
local economy of the area. | | Keywords : | | | groundwater survey, vertical electrical sounding, Orlu
area, overburden thickness, borehole drilling |
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