The green panel had directed the Delhi government and other authorities to submit a status report on the condition of river Yamuna after the immersion of Ganesh and Durga idols.
DDA told a bench headed by NGT Chairperson Justice Swatanter Kumar that the responsibility for organising and managing the immersion of idols at specially created ghats on Yamuna floodplains vested with the Department of Irrigation and Flood Control and the municipal corporations concerned.
"The irrigation and flood control has already cleared the immersed idols from the specified ghats created for the purpose of immersion of idols and has dumped the same on the floodplain, in place of disposing safely in MCD construction waste site within a period of 48 hours from immersion, which is in violation of this tribunal's direction" DDA said.
Terming this as a "lacklustre" approach of the municipal corporations, the report, filed through advocate advocate Kush Sharma, said it has removed debris in the form of idols through 20 trucks weighing about 80 tonnes dumped on the flood plain.
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During the hearing, the counsel for Delhi government told the bench that the cleaning process of the banks of the river was in progress, the idols which were immersed were being removed and the authorities including the municipal corporations will carry them to the appropriate sites.
The matter was listed for next hearing on October 12.
The NGT was hearing a plea filed by environment activist Akash Vashishta seeking directions for steps for cleaning the banks of the river which, he said, were completely choked with dumped waste.
The bio-oxygen demand of the river, a measure of organic pollution, reached "dangerously high levels" during Ganesh Chaturthi, the plea, filed through advocate Upama Bhattacharjee, said.
Stressing that the river was dying a slow death, the petition said the continuous and unabated immersion of idols into the Yamuna have caused complete choking, turning the river into a virtual dumpyard of waste.
It has sought directions for a complete bar on dumping of waste and an action plan to deal with idol immersion in the entire National Capital Region (NCR).
"Idol immersion should be allowed only of the ones which are made from bio-degradable material and not plastic/plaster of Paris. Only those colours should be used on the idols which are environment-friendly," the bench had then said.