The woman, in her late 20s, was fully clothed and there were no injury marks on her body barring one on her foot which might have been sustained due to falling on the road, a police officer said.
A PCR call was made by a passerby who saw the woman's body near the drain. She was rushed to a nearby hospital where she was declared brought dead, he said.
Some liquid was coming out of her mouth when her body was discovered, the officer said, adding that one of her slippers was found a few metres away from the spot.
Meanwhile, a police team questioned people in the area and scanned the records of missing persons to determine the identity of the woman, he added.