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There are at least a thousand dams on the Ganga basin obstructing the flows of its various tributaries and adversely affecting the overall health of the river system, according to a recent assessment by researchers and experts from multiple organisations. “Rejuvenating Ganga — a citizen’s report” released during ongoing India Rivers Week, has put together an analysis of why flows in most rivers of the Ganga basin are dwindling, and recommended that the Centre make environmental flows mandatory for the entire basin and not just the main stem of the river. The Natural Heritage Division of the Indian National Trust for Art and Cultural Heritage (INTACH) has mapped the dams, barrages and hydroelectric projects based on data from Water Resources Information System of the Central Water Commission, the Uttarakhand Renewable Energy Development Agency, and the Uttarakhand Jal Vidyut Nigam.