Aquifer Hydraulic Parameters Estimation from Surface Geoelectrical Measurements in Wadi Al Hawad Basin, Sudan

Abstract

The relationship between hydraulic parameters and electric resistivity is one of the most difficult and challenging approaches in the field of hydrogeophysics. Usually, the aquifer parameters are obtained by the analysis of pumping tests data which provide limited spatial information and turnout to be overpriced and time consuming. Vertical Electrical Soundings and pump testing of boreholes were conducted to delineate the aquifer system at Abu Deleig area in northeastern part of Khartoum basin. The electrical resistivity survey confirms the existence of two groundwater aquifers. An upper aquifer composed mainly of alluvial sediments and shallow sandstone is found at depths ranging between 20-30 m; while the lower aquifer is predominantly Cretaceous sandstone found at depths below 50 m, each of these aquifers shows a wide range of variable hydraulic parameters, due to the high in-homogeneity of the sedimentary formations. In this study the groundwater resistivities (