In March 2004 a burst water pipe in Blackfen Road caused the flooding
of one hundred homes. Water levels rose to more than four feet and
people were forced to retreat upstairs, trying to lift their valuables above
the water. The most serious flooding was in Penshurst Avenue and Maple Crescent. Stranded residents were rescued by police dinghy and the Salvation Army dispensed hot drinks while Thames Water dealt with the emergency. Local schools were shut and Blackfen Road was closed for resurfacing, affecting business for shops. Some families had to be housed in hotels while their homes were repaired.
The incident was reported in the Evening Standard: https://www.standard.co.uk/news/sidcup-runneth-over-6946186.html
and BBC News: http://news.bbc.co.uk/1/hi/england/london/3505588.stm