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Another cloud seeding experiment, yet no rain

india Updated: Aug 10, 2009 01:26 IST
Bhavika Jain

Another cloud seeding experiment carried out over Tansa on Sunday didn’t yield any result. It was the fourth experiment in the last three days.

At 11 am, 150 gm of silver iodide was burnt over a spot in south-west direction of the catchment area of Tansa, but negligible rainfall was experienced after the experiment.

“The cloud formation and the moisture content in the clouds is very low and hence these experiments are not yielding any results,” Pramod Guhe, deputy hydraulic engineer told Hindustan Times.

Cloud seeding is an artificial method of inducing precipitation from clouds in which silver iodide (ground generator) or dry ice (frozen carbon dioxide) is used.

The two experiments carried out over Tansa on Saturday were also unsuccessful due to bad cloud formation.

“Only 8 mm of rainfall was recorded after Saturday’s experiment, the reason for the failed attempts is that the cloud situation is not consistent,” added Guhe.

“When we conduct the experiment, the formation is just right but in a few minutes the clouds are nowhere to be seen,” said Guhe.

On Sunday, Vihar and Tulsi recorded 0 mm rainfall and Tansa on which four experiments have been conducted till now recorded only 3.80 mm rainfall.

Mumbai receives its daily water supply of 3,400 million litres daily from six lakes — Tansa, Modak Sagar, Vihar, Tulsi, Upper Vaitarna and Bhatsa.

The demand of the city is 4,100 million litres daily. There is a short fall of 700 million litres daily.

The first experiment that was conducted on Friday afternoon recorded 16 mm of rainfall — it was the most successful experiment so far.

However, the experts don’t endorse this kind of cloud seeding method.

According to J R Kulkarni, project manager, cloud aerosol precipitation programme by the Indian Institute of Tropical Meteorology, Pune this method is not scientifically proven.

“This method lacks scientific acceptance and has not given adequate results,” said Kulkarni.