Firefighters are continuing to pump excess water away from homes from the water treatment works at Kenley - 60 people have been evacuated.
The parents of 14-year-old Shelley Pratt say they are worried that someone may be stopping her from coming home.
Former prime ministers Gordon Brown and Tony Blair led tributes to former Labour energy minister Malcolm Wicks, who has died at 65.
INFO: 18:10 London Bridge to West Croydon service has been cancelled due to a train incident
INFO: 18:59 West Croydon to London Bridge service will now start from Tulse Hill
Croydon Council said its plan to use an underground footway in Purley to hold around 600,000 litres of water was approved after its "primary" pond at Purley Depot overflowed on Friday night.
– CROYDON COUNCIL LEADER MIKE FISHER
This has not been an easy decision to take but it has become increasingly clear over the past few hours that we have no alternative if we are to protect people's homes and businesses from being flooded.
Water is being pumped into a pedestrian underpass in Croydon to protect around buildings under threat. The Purley Cross underpass will be turned into an emergency pond as hundreds of thousands of litres of water is pumped into the area.
Authorities hope the move will protect around 400 buildings which are under threat from flooding in Kenley and Purley. They are also trying to protect a water treatment works which supplies tens of thousands of homes.
The Metropolitan Police say that 74-year-old Jasna Chase-Gray from Croydon has been found after she went missing yesterday.
Police are trying to track down a prisoner who absconded in Kent, and may have headed to London. 55-year-old Malcolm Parker is known to have links with Croydon and Hendon.
He left prison on Monday, 6 January on temporary licence, but failed to return. He is described as black, 6ft 1ins tall, of medium build with balding hair. He has a distinctive scar on his left elbow which is between one and two inches in size.
Anyone with information should contact police on 020 8358 1752.
Police have named the 17-year-old boy who died after being stabbed at an address in Croydon on Wednesday as Fico Dougan. A post mortem revealed the cause of death was a stab wound to the heart. A 16-year-old boy appeared at Croydon Youth Court today and has been remanded in custody.
The 17-year-old victim has not been named, but local councillor Stuart Collins says he understands he had no connection to gangs, and that the boy arrested was not from the Croydon borough.
– Stuart Collins, Local councillor
In terms of that street and that area, there hasn't been regular crime or activity of that kind.
But there has been requests for a local police station in the community in Broad Green since the riots.
- The teenage victim in Croydon is the 11th to be murdered in London this year
- A total of eight teenagers were murdered in the capital in 2012
Source: Met Police