Kochi: Water was released from over century-old Mullaperiyar dam at around 1 pm on Friday as the level crossed 137.4 feet.
Three shutters were raised at regular intervals
to release about 534 Cusecs water into Periyar river which would flow into Idukki reservoir.
The shutters were raised by about 30 cm.
The inflow into the dam was about 9,000 cusecs while the quantity of water taken to Tamil Nadu was 2000 cusecs.
Tamil Nadu may release about 1000 cusecs of water after studying the prevailing situation by raising three other shutters.
Tamil Nadu is permitted to store water at a level of 142 feet even as the Full Reservoir Level of the dam is 152 feet.
The water released from Mullaperiyar dam reaches human inhabited areas of Vallakadavu in 20 minutes. It further passes through Manjumala, Vandiperiyar, Mlamala, Shanthippalam, Chappath, Aalady, Upputhura and Ayyapankoil where it enters the vast reservoir of Idukki by flowing for two hours.
The Idukki dam has 1,031 million cubic metre (MCM) of water which is 71 percent of its full capacity of 1,460 MCM.
The water level in the dam was 2,375 feet against its full level of 2,403 feet.
Meanwhile, water level in Chalakudy river has stabilized as inflow into the river has come down giving much respite for the authorities.
Opening of Peringalkuthu dam after Tamil Nadu released water from Parambikulam had triggered sudden increase in water level in the river.