A bench headed by Justice M S Nambiar also pulled up the DJB for delay in compliance of its April 18 order that had sought information on RWHS and directed it to submit the report in three weeks.
It said a petition seeking the installation of rainwater harvesting systems in hotels, hospitals and malls in the national capital has been pending before it for the last three years and added that the process in housing societies should be pursued simultaneously.
During the hearing, an assistant engineer of the Delhi Jal Board told the green panel it has started three rain centres at Dwarka, R K Puram and Lajpat Nagar.
The tribunal also dropped proceedings against Jaypee Sidharth Hotel after it was informed that the design of the rainwater harvesting systems was duly-approved by the DJB and was functioning properly.
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Taking several hospitals, malls and hotels to task for not complying with its orders on rainwater harvesting, NGT had last year imposed fines and issued warrants to many of them for not installing these systems.
The green panel has widened the ambit of the petition and incorporated various other establishments like hospitals, hotels and malls.