Salient is an excellent design with a fresh approach for the ever-changing Web. Integrated with Gantry 5, it is infinitely customizable, incredibly powerful, and remarkably simple.
International (i.e., beyond the navel-gazing confines of the U.S.A.) links with a ground water focus
The BGS has a long history of distinguished earth science, very good source of African information (and very active on Twitter with numerous handles)
General interest geology links resource
Raising GW awareness in the U.K.
Department of Planetary and Earth Sciences
Secteur d'Hydrogéologie et de Géologie de l'Environnement
Literature on ground water in southern and eastern Africa housed by the British Geological Survey
Abundant information resources on ground water in Africa
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Ground Water Science can help you develop a well cleaning and maintenance program.