At 12.30 p.m. on Thursday, the water level crossed 2,399 metres, and one of the shutters was opened after a gap of 26 years. Rescue operations are being carried out round-the-clock, and around 500 relief camps have been set up so far.
More than 50 tourists, including 24 from overseas, are stranded in a resort in Munnar after the road leading to it was damaged in a landslide.
State Revenue Minister E. Chandrasekheran, who is camping in Ernakulam and coordinating the activities said things were under control as the five teams of the Army were taking part in the damage control exercises in Idukki, Wayanad, Kozhikode, Malappuram. A red alert was issued for Idukki and its adjoining districts in view of the possibility of release of more water from the Idukki reservoir.
Officials from the state meteorological office said that heavy rain was expected for two more days.
State Chief Minister Pinarayi Vijayan visited flood affected areas.
At present, Kerala has been observing a rainfall surplus of 15 percent.
Monsoon rains kill hundreds of people every year in India through house collapses and flooding of wide swaths of land.
Five columns of Army have been deployed in the state's seven severely-hit northern districts, out of Kerala's 14, to help evacuate people and to build makeshift bridges even as the Indian Navy's southern command launched 'Operation Madad'. As per the reports, CM said that he has also spoken with Prime Minister Narendra Modi and Karnataka CM H. D. Kumaraswamy and has brief them about the "grim" flood situation in the state. Nearly all 40-odd rivers in the state are in spate, officials said.
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Several tourists were barred from entering the hilly Idukki district after roads caved in at many places.
The number of people who have died in floods and landslides triggered by unprecedented levels of rain in Kerala climbed to at least 29, with dozens of others still missing.
A red alert has been issued for Idukki and its adjoining districts.
At least 26 people have been killed so far in Kerala, including 11 in high-range Idukki in landslides.
"The opening of the dams has caused anxiety among people living on the banks of the Periyar River".
In addition to this, the shutters of 22 reservoirs in Kerala has been opened up due tothe increasiong water levels in the state due to rain.
The fifth and last shutter has been opened as well, the first time ever since the Idukki came into existence in the mid-1970s.
According to informed sources, if the water level in the dam comes down to 2,400 feet, it was likely to bring down the outflow through the five shutters as well - to around 5,00,000 litres per second.