A bench headed by NGT Chairperson Justice Swatanter Kumar said the water which is being diverted into the various canals should be regulated so as to help maintain a minimum flow of the river.
"Extraction of groundwater directly affects the flow of the river. The problem with Ganga is two-folds, as a huge quantity of water is extracted and additionally, effluents are discharged into the river. Excessive extraction of water is a serious problem," the bench, which also included Justice R S Rathore, said.
When the bench asked the Ministry about a possible solution to the issue of water withdrawal, the counsel said the official concerned was not present.
The NGT took exception to this and directed the counsel to call him and appear before it within 15 minutes.
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"Answer our query or face the consequence. We don't want any study or report. We want clear cut solution and answer," the bench said while adjourning the matter for hearing tomorrow.
E-flow defines the quantity, timing and quality of water flow required to sustain freshwater and the estuarine ecosystems, besides human livelihood.
Earlier, the new Uttar Pradesh government had favoured the shifting of British-era tanneries releasing toxic wastes into the river Ganga at Kanpur.
It had told the NGT that the hunt for a new site for setting up of these leather units, which are a "major source of pollution" in Ganga, was under consideration and would be identified soon.
In a detailed report covering various aspects of contamination in the river, CPCB had informed the NGT that the Ganga, spanning a distance of 543 km between Haridwar and Kanpur, was affected by 1,072 seriously polluting industries which were releasing heavy metals and pesticides.
At present, 823.1 million litres per day of untreated sewage and 212.42 MLD of industrial effluents flow into the river, while three of the four monitored Sewage Treatment Plants were non-compliant with the set standards, it said.