This research project demonstrates the interest of applying a spatial downscaling technique to ensemble rainfall forecasts from Environment Canada's Global Environmental Multiscale model (2009 version), and proposes innovative and effective real-time control strategies (sometimes relying on the downscaled forecasts) of an urban stormwater detention pond. Ensemble rainfall forecasts are indeed valuable in the field of water management for their explicit and dynamic assessment of the associated uncertainty. However, for hydrological forecasting, their low resolution currently limits their use...