Hydrogeology is a field of national importance. The role of hydrogeologists in identifying water resources and developing management strategies for sustainable groundwater use is very important. Massive population explosion and concentration in cities has resulted in over exploitation of groundwater and scarcity. New problems like sea water intrusion and identification of suitable artificial recharge mechanisms to replenish the depleting water levels are increasingly been discussed by a broad spectrum of stakeholder.The book mainly attempts at integrating information on the entire range of the subject: Hydrogeology with stress on geological concepts. With the arrival of new techniques like GIS, Remote Sensing and GPS armed with the power of modern information technology, integrated groundwater studies have a lot of scope today. Hence this book attempts to introduce GIS modeling and works in that direction.