The RainGain project organized on 16 April 2012 an international workshop on fine-scale rainfall estimation. The workshop brought together about 35 radar meteorologists and urban hydrologists, to bridge the gap between these two disciplines. They discussed the use of new radar technology for measuring the intensity of heavy rain showers over urban areas. Such measurements are required to enable urban floods to be predicted at street or house level. The experts recommended innovative methods that will be implemented in the project in four pilot sites: London, Paris, Rotterdam and Leuven. This will allow urban citizens to be better protected and prepared against ris ks induced by extreme rain storms.