Water management and control are more than ever key issues for our urban systems. Various
events remind us quite regularly that our cities are highly vulnerable to extreme weather. Thus,
urban flooding remains the most expensive natural disasters in France.
The context is characterised by climate change, which should lead to more frequent extreme
climate-related events according to the Intergovernmental Panel on Climate Change and the
pursuit of urban development. These two drivers are likely to deeply alter the water cycle in
urban environment. Thus, the fact that urban areas are largely impervious can not only generates
flash floods, but also significantly reduces the recharge of the phreatic tables.
Urban hydrology has to be largely revisited because of pressing scientific stakes, technical
and socio-technical issues so that managers can access to a new control of water flows and
pollutants, with the help of higher resolution data and more sophisticated models and decision
Tools. Thus adaptation to climate change will require profound socio-technical changes for managers,
but also in the regulation, due to the non-stationary climate.
These few contextual elements emphasise the complexity of scientific and technical issues to
overcome to develop a hydrology for resilient cities.