Groundwater Occurrence in Regions and Basins

Abstract

In the context of regional geodynamics, the Geology of Ethiopia is the result of complex orogenic evolution that involves: terrain accression and collision in Precambrian; peneplanaton, glaciations, and Gondowana breakup in Paleozoic; cyclic marine transgression and regression events leading to accumulation of multilayered sedimentary rocks in Mesozoic; huge continental flood basalt erup- tion and formation of rift valley in Cenozoic and sedimentation, and deep incision of river valleys and pluvial-interpluvial sediment accumulation in Quaternary. These mega events have left distinct imprints on landscape, hydrology, and groundwater occurence in Ethiopia.