Development of an innovative for the urban drainage systems design and rehabilitation: transient flow with entrapped air based approach

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Transient flows can cause hydraulic failures such as collapse of infrastructure, manhole cover blow off, geysers, and basement flooding, as well as the release of air from the manholes. The transition phenomenon coupled to the trapped air problem has critical effects, yet existing numerical models (such as Mike, HydroWorks, SWMM ...) dealing with the drainage systems simulations either neglect or excessively simplify it. In fact, such models generally use non-dynamic hypotheses such as the open-slot approach and the non presence of trapped air into flowing water. The transient flow dynamic analysis should be part of both the design and the rehabilitation processes for building highly efficient sustainable drainage infrastructures. Because the current design approach lacks this kind of analysis, drainage systems face unpredictable phenomena, making them unsafe and vulnerable.