Hydrogeology, also known as groundwater engineering, is a field of earth science. It deals with the distribution and movement of groundwater in the soil and rocks of the earth's crust. The main focus areas in hydrogeology include groundwater contamination, conservation of supplies and water quality. It deals with the flow of water through aquifers and other shallow porous media. Darcy's law diffusion equation and Laplace equations are a few mathematical relationships that are extensively studied and applied within this field. The aim of this book is to present researches that have transformed this discipline and aided its advancement. The topics included herein on hydrogeology are of utmost significance and bound to provide incredible insights to readers. This book will prove to be immensely beneficial to students and researchers in this field.