This bulletin introduces the reader to 19 basic groundwater concepts and the appropriate terminology used in describing them. Groundwater protection programs require an understanding of the groundwater resource. Learn about: Groundwater location, saturated zones, unsaturated zones, water tables, permeability, porosity, aquifers, recharge, confined or artesian aquifers, unconfined or water table aquifers, discharge points, flow rates, gaining streams, losing streams, well cones of depression and induced recharge, well contribution zones, drainage areas, and groundwater myths.