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The fastest advance of the wetting front takes place during the earliest times of infiltration ( less then 2 h), with plausible propagation velocities and infiltration rates higher than 1000 m∙d-1 and 2 m3∙s-1. As time progresses, the propagation velocity and infiltration rate decrease as a consequence of the hydraulic gradient attenuation between the gallery and the aquifer. Therefore, stormwater infiltration is a highly transient process in which a sizing underestimation of 100% may be committed if unsaturated conditions or geological co