River Basin Management IV is the fourth of a successful series of international conferences. It took place on the Greek island of Kos, birthplace of Hippocrates, the father of Medicine. The papers presented there, are included in this volume.

River basin management is a complex and interdisciplinary issue. It essentially includes river and groundwater flows, quantity and quality of water resources, water and soil interaction, droughts and floods; all these, in a frame of increasing and competing human demands, deterioration of natural resources, climate change, changing public views, attitudes and awareness of environmental problems, new national and international legislation and ever increasing scientific knowledge.

The complexity of river basin management is reflected in the content of this volume. It includes papers on: water resources management, river and watershed management, hydraulics and hydrology, hydrological modelling, flood studies, sediment transport, stream bank erosion & protection measures, Ecological & environmental impacts and water quality issues.