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The maximum storage limit of the 128-year-old dam is 142 ft.
The rise in water level was the result of unexpected and continuous rains received in the catchment area from Sunday afternoon.
The shutters will be open in different phases starting from 10 am on Tuesday and will release 1,000 cusecs of water through its spillway.
Water Resources Minister Roshy Augustine said that the Irrigation Department had been planning to buy a new boat for its officials since the water was allegedly released by Tamil Nadu from Mullaperiyar dam without prior warning in November 2021.
Experts say the report's reference goes against the apex court's direction to hold an independent study
A bench presided over by Justice M R Shah directed the Centre to file an affidavit that contains other details regarding the State Dam Safety Committee.
The 127-year-old existing structure, a masonry gravity dam on the River Periyar, is located at Kumily Panchayat within Peermade taluk of Idukki district.
While the tunnel discharge was 750 cusecs, the average inflow was 1,687.5 cusecs.
The Hyderabad-based agency studied the environmental impact the proposed structure may cause to the catchment areas of existing and planned dams.
The dam will be opened if the water level crosses 142 ft.