Three others who were rescued were rushed to a hospital in the area. The body of the yet-to-be identified woman has also been deposited at the Koforidua Hospital morgue.
The incident happened around 2:00pm Sunday at Nsukaw, a suburb of Koforidua, during a downpour that caused the area to flood. The road that stretches from the Pentecost Church and the Koforidua Clinic were the hardest hit.
Some drivers were said to have ignored a warning by residents in the area not to use the road considering the extent of flood.
According to eyewitnesses, the driver of the taxicab with registration GC 2631-11 ignored advice not to drive through the flood. He was said to have stuck midway and before they could move out, were swept into a nearby drain.
Eyewitnesses told our correspondent, Stephen Gyampoh, that the driver was rescued unconscious, and with some claiming he might not survive.
The victims were rescued by onlookers, eyewitnesses told our correspondent, claiming that the personnel from the Ghana Fire Service who were called in were helpless as they had no rescue gear.
The eyewitnesses said the fire personnel arrived with just a fire tender and looked on as the people rescued them.
The Fire personnel later pulled the taxicab from the drain, our correspondent reported.