MOEF recommends a minimum flow of a little less that one cumec, while the Bhagirathi requires 13 cumecs of flow throughout the year to maintain its Class A status. The International Water Management Institute defines a Class A river as one whose water needs little treatment for drinking. New study, just hogwash? Environmentalists have criticized the pilot study on grounds that MOEF will only be repeating what the earlier committee has undertaken.

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Source: http://www.downtoearth.org.in/full6.asp?foldername