A night of heavy rain accompanied by lightning and thunder was followed by a sunny Monday as, the weatherman said, the clouds had emptied themselves.
The rain came in two spells, from 9.40pm to 10pm and then from around midnight to 3am.
The Alipore weather office recorded 87mm. According to the CMC’s pumping stations, from Sunday evening to Monday morning, Ballygunge received 147mm of rain, Topsia 113mm and Kalighat 99mm.
Neighbourhoods like Ballygunge Circular Road, Sunny Park, Dover Terrace and Ballygunge Place were the most waterlogged. Many of these places were flooded till Monday morning.
CMC sources said they were flooded with late night calls from the army camp on Ballygunge Circular Road and residents of the area to complain about the flooding.
Civic officials blamed the waterlogging on contractors desilting drainage lines under Hazra, Rashbehari Avenue and Ballygunge Circular Road. The drains have to be blocked at various points because of the work. The contractors, who are supposed to remove the blocks when there is possibility of heavy rain, allegedly did not do so.
“The rule is to remove the blocks in the drainage pipes whenever there is a heavy cloud cover. But there is no coordination between the drainage wing and the project and development wing of the CMC. We don’t even know the locations of the blocks,” said mayoral council member (drainage) Rajib Deb.
Since the contractors could not be contacted at night, Deb added, the water kept accumulating.
“Water could not drain out from parts of Ballygunge throughout the night,” said a CMC official.
The north received less rain. Maniktala and Belgachhia recorded 32mm of rain in 24 hours till Monday noon.
Localised thunderclouds, common at this time of year, caused the rainfall.
“A low-pressure area had developed over the central part of the state causing excess inflow of moisture but it is gone now,” said Gokul Chandra Debnath, director, India Meteorological Department, Calcutta.
“The very heavy rainfall on Sunday night meant that the clouds had emptied, which led to clear blue sky on Monday. As a result the sunrays could reach the surface unhindered, leading to maximum temperature of 34.6 degrees Celsius, three degrees above normal,” added Debnath.
According to the Met office, little rain is expected in the next few days and temperatures could soar.