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

Abstract The recent research is carried out to model the characteristics and productivity of groundwater aquifer in Omdurman area, Sudan, by combining electrical resistivity pumping test methods. most populous city known as traditional capital Sudan. Vertical sounding (VES) survey using Schlumberger array along four profiles delineate potential zones. Application 1D geophysical inversion revealed five geoelectric layers, including deposits, clay, silicified ferruginous sandstone, sandstone. Additionally, based on outcome VES inversion, Dar Zarrouk parameters, transverse resistance longitudinal conductance, were calculated characteristics. ranged from 5587 309,853 ?m 2 , while conductance varied between 0.14 2.5 ? ?1 . hydraulic conductivity transmissivity are further measured data, ranging 1.4 5.2 m/d 435 1564 m /day, respectively. step-drawdown tests performed evaluate thus validate result geoelectrical method. obtained step 583 1226 showing an acceptable agreement with those data. Based classified highly productive ideal for development. drawdown was used assess performance wells. results indicated that faulty well design inappropriate rates influence some wells study resulting high low efficiency. Overall, objectives successfully achieved; nonetheless, detailed hydrogeological investigations recommended comprehensive evaluation aquifer.