The main objective in producing the second edition of “Applied Hydrogeology of Fractured Rocks” is to incorporate in the book recent advances in this field. In this new edition, topics such as tracer and isotope techniques, groundwater contamination and groundwater modeling have been enlarged into full-length chapters. Besides, additional information has been incorporated in nearly all the chapters particularly for updating latest techniques and information in geophysical exploration, satellite remote sensing sensors, hydrogeology of crystalline and carbonate rocks, well hydraulics, and groundwater conservation and management, with numerous examples. The critical suggestions from colleagues and esteemed reviewers of the first edition have been taken into consideration to the extent possible.