This report published in 2011 was part of the wider Drain London project. This study has not identified any past floods that are considered to have had significant harmful consequences. This is based on the following local definition of harmful consequences: ‘Memorable past floods or otherwise registered on a national scale (such as the summer 2007 event) even if only occurring over a relatively small area.’
Future flood risk is estimated to be high in the borough. Based on the Drain London surface modelling outputs, approximately 16,400 properties are estimated to be at risk from flooding during a rainfall event with a 1 in 200 annual chance of occurring.