Abstract
Spatial variations in the essential aquifer parameters obtained through regular aquifer tests were evaluated for some aquifers of the Neoproterozoic sedimentary aquifers of the Voltaian Basin. Ordinary least squares regression models have also been developed to relate aquifer transmissivity and specific capacity, and well yield and transmissivity. These analyses suggest that in the northern parts of the Voltaian, aquifer transmissivity exists in a non-linear relationship with specific capacity and yield. This is in keeping with the findings of previous research in the southern part of the Voltaian, and deviates from the regular Dupuit-Thiem relationship between the two major aquifer parameters. Lithology specific models have been developed in this study. The exponent of the non-linear models appears to be related to the lithology, and tends to approach unity in the mudstone and siltstone aquifers, whilst manifesting obvious departures from nonlinearity amongst the sandstone aquifers. This study finds that the sandstone aquifers are the most prolific and offer themselves as the best lithologies for drilling successful wells in the area. Linear prediction maps suggest that the most prolific aquifers are located in the northern parts of the study area, where aquifer transmissivity, specific capacity, and well yield values are quite high due to enhanced secondary permeabilities. There has been no obvious relationship between the major aquifer parameters and static water levels, which are quite high in the middle and western sections of the study area. The hydrogeological properties of rocks within the Voltaian appear to be based on discrete structural entities which manifest high variability in the study area. Even within the same lithology, standard deviations are quite high in the data for all the aquifer parameters examined in this study.
Highlights
Specific capacity, which is the ratio of the discharge from a well to the corresponding draw down in the hydraulic head of the aquifer, is similar to aquifer transmissivity and is much easier to determine in the field at modest to low costs
Ordinary least squares regression models have been developed to relate aquifer transmissivity and specific capacity, and well yield and transmissivity. These analyses suggest that in the northern parts of the Voltaian, aquifer transmissivity exists in a non-linear relationship with specific capacity and yield
This study has shown that transmissivity exists in a nonlinear relationship with specific capacity in the Savelugu/Nanton District of the Northern Region of Ghana
Summary
Specific capacity, which is the ratio of the discharge from a well to the corresponding draw down in the hydraulic head of the aquifer, is similar to aquifer transmissivity and is much easier to determine in the field at modest to low costs. This parameter is in part, a function of the hydraulic properties of the aquifer and has been historically used to quantity the productivity of a well and to determine where to install the pump to ensure its optimal delivery [1]. There are various ways of relating the two parameters and for correcting specific capacity data to account for partial penetration, turbulent well losses, and fracture flow [1] These are the analytical, empirical, geostatistical, and hybrid approaches for relating aquifer transmissivity with
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