Human pressure on coastal areas is undeniably extremely high. Eighty per cent of marine pollution comes from land-based sources and, in the developing world, more than 90% of sewage and 70% of industrial wastes are dumped untreated into surface waters where they pollute water supplies and coastal waters with harmful consequences to biodiversity, human health and coastal ecosystem services. By 2025 it is estimated that 75% of the world's population, or 6.3 billion people, will live in the coastal zone, naturally, this will increase the pressure on water resources and reduce their sustainability. In addition, global change is affecting coastal ecosystems both from land (e.g. changes in hydrologic cycles and precipitation patterns), and from the ocean (e.g. changes in sea level). Thus the urgent need to address these impacts and the interest in applying ecohydrological approaches to contribute to sustainable solutions.