Transport impacts Extreme rainfall events can bring cities to a halt. Cloudburst events, where intense rain falls in short periods of time, cost Copenhagen DKK 1.3 billion in 2011, for example, prompting the city to invest in a major cloudburst management plan. Stormwater floods often cause major disruption to the mobility of a city by impacting the transport sector. In recent years, Washington DC, Madrid and Paris have experienced intense downpours that flooded their metro stations. Sydney’s simulations of stormwater flooding found that the flooding of one rail corridor alone would disrupt 70% of the city’s trains. As the rail corridor is linked directly to the central business district, floods could cause huge economic losses, not to mention the cascading impact on substations, the motorway and the airport.