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Loads acting on urban drainage systems are intrinsically uncertain and often known with limited details given their physical complexity. External loads include climate variables (rain, snow, temperature …), which have a naturally mutable behaviour, exacerbated by climate change. Other system variables, such as roughness of surfaces and soil permeability, are normally unknown and only partially measurable. Additional sources of uncertainty derive from the transposition of the physical system into numerical models, routinely used to make predictions about real systems and their design and management.