The green panel asked CGWA, DJB and Delhi Pollution Control Committee (DPCC) to convene a meeting within 10 days and prescribe a format and proper design for rainwater harvesting system.
"There should be a uniform procedure in respect of the rainwater harvesting system, approved by CGWA/DJB.
"As it is disclosed that there is no such uniform procedure, we direct CGWA, DJB and DPCC to convene a meeting within 10 days and fix a uniform procedure, prescribe a format as well as proper design for rainwater harvesting system to be installed by hotels, hospitals and malls," a bench headed by Justice M S Nambiar said.
NGT had recently slapped a fine of Rs 5 lakh on a real estate developer here after it was found that the rainwater harvesting system in its property was not functional.
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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 fine and issued warrants to many of them for not installing these systems.
The green panel was hearing a plea by environmentalist Vikrant Kumar Tongad who had sought directions to Delhi Metro Rail Corporation to "install proper rainwater harvesting system" on all its existing, proposed and under-construction metro stations, tracks and depots.