Groundwater Flow Modeling: A Case Study of the Lower Rusizi Alluvial Plain Aquifer, North-Western Burundi

The study area, in northwestern Burundi, is an alluvial plain consisting of fine clayey sands and coarse with mixed lithology. aquifer the lower Rusizi could be considered as confined under a clay layer. A 2D horizontal groundwater flow model was developed steady-state conditions using Modflow software. aims to determine most productive areas this main inflow outflow values together recharge river–aquifer interactions. potential dependent on spatial distribution hydraulic conductivity thickness providing local transmissivity values. calibrated made it possible assess at regional scale, which ranged from 6 × 10−6 (contact between Precambrian basement) 7.5 10−3 m/s (coastal barriers). results also provided computed directions, estimation levels not yet investigated by drilling. budget allowed us deduce that interaction constitute while downwards boundaries (where piezometric heads prescribed) are zones where outflows occur. can used planning pumping test programs, locating high plan water supply for different private public users. This predictive tool will contribute resolution problems related use integrated management resource part Burundi.