What is meant by environmental flow?
An environmental flow is water released from a dam or a weir to maintain downstream river health. … Environmental flows can help to: Protect aquatic ecosystems and reduce aquatic weeds and frequency of algal blooms. Improve river health.
What is minimum environmental flow?
Minimum ecological flow is based on the principle that a certain amount of minimum flow must be present in a flowing freshwater ecosystem such as a river or an estuary so that the ecological quality of the flowing freshwater ecosystem is maintained.
How are environmental flows obtained?
Environmental flows can be implemented by managing water withdrawals or diversions, changing operations of a dam, or by other changes to the design or siting of infrastructure, including policies or decisions that maintain free-flowing conditions on a river.
What is environmental flow assessment?
Thus has evolved the science of environmental flow assessment, a process whereby the quanity and quality of a water resource required to maintain the ecosystem on which society depends, may be determined.
What is environmental flow management?
An environmental flow, or e-flow for short, is any managed change in a river’s flow pattern intended to maintain or improve river health. Environmental Flow activities. The North Central Catchment Management Authority (CMA) updates regular e-flows activities.
What are minimum flows?
A: A minimum flow or level, commonly referred to as an MFL, is the limit at which further withdrawals will cause significant harm to the water resources or ecology of the area. Minimum flows are typically expressed as a rate of flow; minimum levels are expressed as water levels in a surface water body or aquifer.
What is minimum flow of a river?
A Minimum Flow Requirement defines the minimum monthly flow required along a river to meet water quality, fish & wildlife, navigation, recreation, downstream or other requirements.
What is an e Flow?
E-flows are a regime of flow in a river that mimics the natural pattern of the river’s flows. It refers to the quality, quantity and timing of water flows required to maintain the components, functions, processes and resilience of aquatic ecosystems that provide goods and services to people.
Why are environmental flows important?
Environmental flows are vital to supporting the river’s ecological processes. High flows provide triggers for fish breeding and supply water for fish passage, so that they are able to move up and down rivers to appropriate habitat. They also keep estuaries open and provide recreational opportunities.
What do you mean by ecological flow of a river?
The term ecological flow means not only the quantity but also the quality of flowing water and also its cultural and aesthetic value. It identifies the required quantity, quality and distribution of flow patterns from the source to mouth of a river, preserving the life in and around the channels.
How does river flow relate to the environment?
River flow determines processes that shape and organize the physical habitat and associated biotic communities. Flow variability is a fundamental feature of river systems and their ecological functioning (Poff et al. 1997). The natural flow of a river varies on time scales of hours, days, seasons, years, and longer.
What is E flow of river?
E-flow is the minimum limit of flow required to maintain a river in the desired environmental state. The state government has planned to regulate the E-flow for polluted stretches of Saryu, Hindon, Ramganga, Betwa, Ghaghara and Rapti rivers.
Why are healthy rivers important?
A healthy river supports many different species of fish and wild life. It can provide safe drinking water for a community and is safe for recreation and harvesting food.
What is E flow assessment?
“Is an assessment of how much of the original flow regime of a river should continue to flow down it and onto its floodplains in order to maintain specified, valued features of the ecosystem hydrological regimes for the rivers, the environmental flow requirements, each linked to a predetermined objective in terms of …