Introductory technical guidance for civil engineers and other professional engineers interested in the interaction of groundwater and surface water. 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.