Introductory technical guidance for civil, environmental and geotechnical engineers interested in the hydrology of ground and surface water interaction. Here is what is discussed: 1. INTRODUCTION 2. SYSTEM COMPONENTS 3. INFILTRATION 4. STREAM-AQUIFER INTERACTION 5. INTERACTION BETWEEN LAKES AND GROUNDWATER 6. ANALYTICAL METHODS 7. ESTIMATING THE TRANSIENT EFFECTS OF FLOOD WAVES ON GROUNDWATER FLOW 8. ESTIMATING BASEFLOW CONTRIBUTION FROM STORM EVENTS TO STREAMFLOW 9. ESTIMATING AQUIFER DIFFUSIVITY FROM STREAMFLOW RECORDS 10. ESTIMATING EFFECTS OF PUMPING WELLS ON STREAM DEPLETION.