Introduction: role of groundwater in the hydrologic cycle, problems and perspectives. Occurrence and movement of groundwater: origin, age, distribution, hydrogeology of aquifers, Darcy's law, flow characteristics, general flow equations, unsaturated flow. Groundwater and Well Hydraulics: steady and unsteady radial flows in aquifers (confined, unconfined and leaky), multiple well systems, partially penetrating wells, characteristic well losses, specific capacity. Surface and Subsurface investigations of Groundwater: Geologic methods, remote sensing, geophysical exploration, electrical resistivity and seismic refraction, gravity and magnetic methodsÍž test drilling, various logging techniques including geophysical and resistivity methods. Water wells: methods of construction, completion and development, yield tests, protection and rehabilitation of wells. Quality of groundwater: measures of quality, groundwater samples, physical, chemical and biological analyses, water quality criteria, and salinity. Pollution of groundwater: sources and causes, distribution, attenuation, evaluation and monitoring, remediation. Management of Groundwater: concepts of basin management, groundwater basin investigations, conjunctive use, mathematical modelling, examples, artificial recharge of groundwater: concepts, recharge methods, recharge mounds, induced recharge. Saline water intrusion in aquifers: occurrence , shape and structure of the interface , upconing, control of saline water intrusion.