chapter 1 Coastal Aquifer Planning Elements -- chapter 2 Saltwater Intrusion in the Coastal Aquifers of Los Angeles County, California -- chapter 3 MODFLOW-Based Tools for Simulation of Variable-Density Groundwater Flow -- chapter 4 Modeling Three-Dimensional Density Dependent Groundwater Flow at the Island of Texel, The Netherlands -- chapter 5 Leaky Coastal Margins: Examples of Enhanced Coastal Groundwater and Surface-Water Exchange from Tampa Bay and Crescent Beach Submarine Spring, Florida, USA -- chapter 6 Tidal Dynamics of Groundwater Flow and Contaminant Transport in Coastal Aquifers -- chapter 7 Determination of the Temporal and Spatial Distribution of Beach Face Seepage -- chapter 8 Integrating Surface and Borehole Geophysics in the Characterization of Salinity in a Coastal Aquifer -- chapter 9 Geographical Information Systems and Modeling of Saltwater Intrusion in the Capoterra Alluvial Plain (Sardinia, Italy) -- chapter 10 Uncertainty Analysis of Seawater Intrusion and Implications for Radionuclide Transport at Amchitka Island's Underground Nuclear Tests -- chapter 11 Pumping Optimization in Saltwater-Intruded Aquifers -- chapter 12 Hydrogeological Investigations and Numerical Simulation of Groundwater Flow in the Karstic Aquifer of Northwestern Yucatan, Mexico.