Estimation of Aquifer Transmissivity Using Dar Zarrouk Parameters Derived from Surface Resistivity Measurements: A Case History from Parts of Enugu Town (Nigeria)

Abstract

Many investigation techniques are commonly employed with the aim of estimating the spatial distribution of transmissivity. Unfortunately, the conventional methods for the determination of hydraulic parameters such as pumping tests, permeameter measurements and grain size analysis are invasive and relatively expensive. A geoelectric investigation involving vertical electrical sounding was carried in parts of Enugu town, Enugu state, Nigeria. The survey was aimed at extrapolating the result of pumping tests over an area. Using the Dar Zarrouk parameter, a β constant of 0.32 was found to translate resistivity to transmissivity with clay content as the primary factor controlling the hydraulic conductivity. Results of the study show a strong correlation between aquifer transmissivity and longitudinal conductance (R 2 = 0.82). Estimation of aquifer transmissivity values based on the results of the resistivity measurements also made it possible to demarcate area with good groundwater potential in parts of Enugu town, Nigeria.

Assessment of Groundwater Potential and Aquifer Characteristics in the Vicinity of Igun, Eku and Oria in Delta State, Nigeria

“…Anomohanran [1] also used this technique to investigate groundwater potential in Ukelegbe Nigeria and successfully recommended sites for locating boreholes in the study area. Utom et al [6] through the use of the vertical electrical sounding was able to estimate the aquifer transmissivity using Dar Zarrouk parameters. Anudu et al [7] in their research succeeded in using resistivity sounding to explore for groundwater in the crystalline basement terrain around Onipe and adjoining area of southwestern Nigeria.…”

Estimation of Hydrological Parameters from Geoelectrical Measurements

“…On the other hand, Kazakis et al [12] obtained linear relations between the K and the resistivity of the aquifer. Some authors have found a linear relationship between T and T R [16][17][18][19]. The works of these authors suggest that there is a relation between the transmissivity of an aquifer and the parameter of Dar-Zarouk, also that this relation is influenced by the geo-hydrological conditions of the place and maintains an exponential relation.…”

“…In this work, we are experimenting in the search for exponential relations between R o and R w ; T and K with the electric transverse resistance. The transverse resistance is one of the Dar-Zarrouk parameters and has been proved to be useful in the evaluation of hydraulic conductivity and transmissivity [14][15][16][17][18][19][20]. In a flat and stratified earth model, each geoelectric layer is characterized by a thickness h and an electrical resistivity ρ.…”

Identification of hydrothermal alterations using Dar-Zarouk parameters and concept of anisotropy for 2D resistivity data

“…ρt results that have been obtained must be grid first. Longitudinal resistivity value (ρl) for each raw data can be calculated by using the Equation 5 from ρl results that have been obtained in advance grid.…”

“…Ezeh used the concept of Dar-Zarouk parameter to estimate the aquifer hydraulic properties in Enugu State [3]. The concept of Dar-Zarouk parameter can also be used to analyze and identify the rock resistivity rock layers [4], and is used to estimate the aquifer transmissivity in Enugu, Nigeria [5]. Okonkwo and Ezeh using the concept of Dar-Zarouk parameter in estimating aquifer hydraulics and delineate zones of groundwater quality [6].…”