Warta
Geologi, Vol. 47, No. 2, August 2021, pp. 103–112
Estimation
of Dar-Zarrouk parameters and delineation of groundwater potential zones in
Karlahi, part of Adamawa Massif, Northeastern Nigeria
Yusuf, S.N.1,*,
Ishaku, J.M.2, Wakili, W.M.2
1 Department
of Geology, University of Jos, Nigeria
2 Department
of Geology, Modibbo Adama University of Technology, Yola, Nigeria
*
Corresponding author email address: solomonjanjaro@gmail.com
Abstract:
Karlahi is largely underlain by granites and migmatites gneiss of the Adamawa
Massif. The area lies west of Benue Trough and east of Cameroon volcanic line.
The aim of this paper is to determine hydraulic properties of water bearing
layer using parameters derived from Dar-Zarrouk equation and characterized them
into groundwater potential zones. The resistivity values of the weathered and
slightly weathered layers which make up the water bearing layers were added and
an average was taken and used as the resistivity of the water bearing formation
in computation of Dar-Zarrouk parameters in Karlahi area. The values of
resistivity of water bearing formation ranged from 18 to 4963 Ωm with an
average resistivity value of 549 Ωm and the thickness of the water bearing
formation ranges from 21 to 32 m with an average thickness of 24.5 m.
Conductivity values range from 0.000201 to 0.05509 (σ) while the
longitudinal conductance range from 0.00483 to 1.2363 Ω-1, the transverse
resistance ranges from 407 to 123504.3 Ωm2. The hydraulic conductivity and
transmissivity values range from 0.14 to 25.87 m/day and 3.28 to 580.4 m2/day
respectively. The longitudinal conductance values in Karlahi area revealed poor
to good with an average longitudinal conductance value that is moderate. High
transverse resistance values are located in the central and southern part of
Karlahi area while low values are located in the eastern part. The spatial
distribution map of transmissivity in the area revealed moderate to high
transmissivity values in the north central part and a negligible to low transmissivity
in southern part, extreme northeastern part. The groundwater potential map of
Karlahi area shows negligible to weak potential groundwater zones in SW and SE,
moderate potential in the central to northern part of Karlahi area.
Keywords:
Dar-Zarrouk parameter, groundwater, hydraulic conductivity, transmissivity,
transverse resistance, Adamawa
DOI : https://doi.org/10.7186/wg472202101
ISSN
0126–5539; e-ISSN 2682-7549
