Presented at the International Association of Hydrogeologists Dijon Symposium, this book contains 43 selected papers, grouped into six topics, that address the following issues: large aquifers, resource assessment; large aquifers, water salinity and evolution; karstic and carbonate aquifer systems; geothermal aquifer systems; aquifer contamination studies; and aquifer monitoring systems and management. In celebration of the 150th anniversary of the publication of Darcy's Law, the volume includes a summary of Darcy's life and his contribution to science, and five invited contributions on modern methods to estimate the hydraulic conductivity of aquifers.