A bench headed by NGT chairperson Swatanter Kumar asked the DJB to file an affidavit to say what amount it would contribute to the project and how and for what would it use the funds provided by Centre.
The tribunal also asked DJB to respond to the Detailed Project Report (DPR) of the sewage projects.
The bench's direction came after it was informed by Water Resources Ministry that around Rs 1400 crore has been sanctioned for Yamuna sewage system under Namami Gange project.
The NGT, which had earlier restrained DJB from spending money on Yamuna, had asked it to submit complete details of works they planned to complete and the funds needed for it.
The panel had directed DJB not to surrender the amount allocated to it in the last fiscal for rejuvenation of Yamuna to the Delhi government.
The tribunal had also made it clear that the board would spend these funds during the year for implementation of its 'Maili se Nirmal Yamuna Revitalisation Project'.
"Hence, while ensuring that all events which are conducted on the river bed are conducted in the most eco-friendly manner, it also has to be considered that citizens of India are bestowed with cultural and religious rights and the balance between the two has to be ensured and none can be effaced...
"The same is also in public interest as cultural, traditional and religious beliefs help in preservation of rivers and environment rather than damaging it. Hence, the same is also part of environmental concern and management and poses legal and substantial questions with respect to environmental concern and management," it said.
"From ancient times all major cultural and religious events in various parts of India have had deep connection to the rivers and particularly unquestionably sacred rivers like Ganga and Yamuna which also includes Kumbh, Magh Mela have not been responsible as the dominant or primary source of pollution in rivers," it said.
