This compendium brings forth the linkages between 'Water and Ecosystems', emphasising that thinking in terms of ecosystems is the key to achieving sustainability. The collection of readings is divided into seven broad categories: (1) Ecosystem Based Approaches to Water Resources Management, (2) Environmental Flow and Ecosystem Services, (3) Applied Hydro-ecology & Eco-Hydrology and Integrated Water Resources Management, (4) Water Pollution and Ecosystem Monitoring (5) Ecological Economics for Water Resources Management, (6) Water-Agriculture-Food-Ecosystem Linkages, and (7) Ecosystem Based Management and Stakeholder Participation. This compendium is an attempt to lend researchers, trainers, field practitioners and students in the field of water resources management a helping hand.