The water level in the Idukki dam was 2,334,56 ft on Thursday as against the 2,387.2 ft on the corresponding day in 2011.
The catchment area of the reservoir received a rainfall of 47 mm on Thursday, an official of the Dam Monitoring and Research Centre, Cheruthoni, said.
He said the water level was at the lowest recorded since 2002.
The decision to lower the water level in the wake of frequent tremors when the Mullaperiyar protests reached its zenith last year and erratic southwest and northeast monsoons had led to the situation. “The water level was lowered to 2,300 ft in the wake of frequent tremors last year, and the rain did not fill that gap,” the official said. Continuous rainfall for at least two days was needed for a nominal increase in the water level. The production level at the Moolamattom power house of the dam was at a low level of 2.35 mu on Wednesday.
Water was being conserved for meeting the needs during the high-consumption period beginning January.
But the present water level raised concern.