§16§All over the world, the awareness of the increasing pollution of rivers, estuaries and the sea with its associated impact on these ecosystems, its effect on organisms, food-chains, water supply and finally on man himself is growing. Estuaries form a link between the limnetic and marine environments, characterized by a variety of complex processes. Most of these phenomena are not yet sufficiently understood, making efficient water quality management a difficult task. The volume has two main objectives: to present the latest information on current estuarine research and to elaborate fundamentals and criteria for planners and decision-makers in water quality management. §04§I Review on Estuarine Water Quality Management.- II Estuarine Modelling.- III Integrated Concepts, Stragegies.- IV Water Dynamics and Transport Processes.- V Estuarine Measurement Techniques.- VI Sediment-Water Interface.- VII Monitoring.- VIII Nutrients and Oxygen Budget.- IX Biological Processes, Environmental Impact.- X Water Chemistry and Speciation.- Author Index.