Civil engineers don't write texts on highway overpass design for keen amateurs, and doctors rarely issue “how to” guides to vascular surgery for the interested layperson. There is however a healthy genre of books and guides explaining to non-specialists how to be a hydrogeologist. A reason for this may be the relative newness of a profession still developing institutions of its own. Another is surely the influence of the appropriate technology movement in the developing world, where accessibility of information is rightly prized. Hydrogeology also intersects with several other fields of study such as geology, economics and engineering, whose personnel sometimes assume competence in groundwater, but who would benefit from access to an excellent reference such as this one.