The Falconbrook was a stream that rose in Balham and Tooting, draining much of those parishes then the south and west of the larger district of Battersea including Clapham Junction to enter the London reaches of the Thames. Before doing so, it briefly formed the border of Wandsworth Town, reflected in the SW11/SW18 boundary today.
The river was culverted in the 1860s and has become an important combined sewer.[1] In 2007, heavy rain caused this to flood, to low but still property-damaging depth, at Falcon Road near Clapham Junction station.