Water for EFR


Water for Environmental Use

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Environment is increasingly being considered a legitimate water user. Many aquatic species require a certain flow regime to live and breed. The environmental or instream flow requirement (EFR) for a river is the minimum flow required to maintain aquatic life. A range of methods are available to assess EFR. The decision on which method to use is dependent on the type of river (e.g. perennial, seasonal, flashy), perceived environmental importance, complexity of the decision to be made, and difficulty of collecting large amounts of information. In India, the estimates put a requirement of 10 km3 for the year 2025 and 20 km3 for the year 2050 for EFR purpose.