Sustainability in Water Resources Management: Changes in Meaning and Perception
The meaning of sustainability in the context of water resources management has changed through the time. Initially meeting water demand was the dominant concern. While later quality issues became more important followed by wider water reuse, today sustainability must include a whole range of aspects (e.g., energy, pollution, persistent chemicals), spatial and time scales. New approaches to define sustainability metrics are needed. A possible approach is to use fundamentallybased entropy and energy flows.