Estimation of Dar-Zarrouk parameters and delineation of groundwater potential zones in Karlahi, part of Adamawa Massif, Northeastern Nigeria

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.

Contribution of Hydrogeophysical Data for the Assessment of Unconfined Aquifer Protection Levels - An Example from the Northeast of Brazil

“…The methodology used in this study was based on the utilization of electric geophysical methods to analyze the protection level of the Barreiras Aquifer in the area of the Catu River hydrographic basin, considering mainly inverse models of vertical electrical sounding (VES), and values of longitudinal conductance (Orellana, 1972;Bello et al, 2019;Kwami et al, 2019;Yusuf et al, 2021). Furthermore, such data were confronted and evaluated as a whole using the Groundwater confinement × Overall lithology × Depth to groundwater table -GOD methodology (Foster and Hirata, 1993;Foster et al, 2002) for the analysis of the local aquifer vulnerability.…”

Delineation of Groundwater Potential Zones of Girei and Environs, Adamawa State, North Eastern Nigeria

“…The maximum value of longitudinal conductance was recorded in the eastern part of the study area (Ngarilde) and pockets around Girei with decrease towards the eastern and western parts of the study area and some pockets in Sangere Njidda (Figure 10). A marked increase in longitudinal conductance may correspond to an average increase in clay content and consequently a decrease in transmissivity (Khalil, 2009;Ankidawa et al, 2019;Yusuf et al, 2021).…”

“…This concept of groundwater management centers on establishment of norms leading to optimization of factors necessary for economic utilization of the resources without disturbing the systems. In geophysical investigations for water, depth to bedrock determinations, sand and gravel are targeted etc., the electrical resistivity method can be used to obtain, details about the location, depth and resistivity of subsurface formations (Okolie, 2010;Ankidawa et al, 2018;Yusuf et al, 2021).…”

Assessment of the Nubian aquifer characteristics by combining geoelectrical and pumping test methods in the Omdurman area, Sudan

“…In this study, the geophysical and hydrogeological parameters are interconnected since these parameters depend on the petrophysical characteristics of the aquifers. Several tests were conducted to establish these connections (Heigold et al 1979;Niwas and Singhal 1981;Yusuf et al 2021). For instance, Dar Zarrouk parameters, a combination of layer resistivity and thickness, are used to detect aquifer characteristics such as longitudinal conductance and transverse resistance.…”