Environmental flow, also known as ecological flow or eco-hydrology, is a critical concept in water resource management that aims to maintain the health and functionality of aquatic ecosystems by ensuring an adequate and appropriate amount of water is available in rivers, streams, wetlands, and other water bodies. Environmental flow assessments consider the natural flow dynamics of a water system, as well as the needs of plants, animals, and other organisms that depend on that water for survival. By understanding and managing environmental flows, resource managers can help preserve biodiversity, promote sustainable water use, and protect the ecological integrity of aquatic ecosystems.