Groundwater and not glacier melts sustain the Ganga during the hot summer months in India, according to the first ever comprehensive isotope study done by the Indian Institute of Technology-Roorkee (IIT-Roorkee). The study found that that the Ganga is not drying because of groundwater depletion but because of over-extraction, excessive diversion and neglect of tributaries.
Groundwater, not glacier melts, is what primarily keeps the Ganga flowing in summer
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