This book has been developed with the intention to highlight the significance of Groundwater governing Equations and Characteristics of different aquifers. It covers the Hydrogeological Parameters such as Water bearing Properties of Rock, Type of aquifers - Aquifer properties. Permeability, specific yield, transmissivity and storage coefficient, Methods of Estimation Norms, Steady-state flow, Darcy's Law, Groundwater Velocity, Dupuit Forchheimer, Steady Radial Flow into a Well and Well Hydraulics of Unsteady state flow, Theis method, Jacob method, Chow's method, Law of Times, Theis Recovery,...