Urban flooding, driven by increasingly intense and localized rainfall events, is a critical challenge to stormwater infrastructure in densely built environments. This thesis investigates the hydraulic response of an urban drainage network located in a part of the city of Turin, Italy under spatially variable rainfall conditions using a numerical modeling approach with the Storm Water Management Model (SWMM). The primary objective is to assess how the spatial structure of rainfall, specifically the location and shape of precipitation, affects the performance and criticality of the drainage system. An exponential distribution is applied to simulate rainfall fields of varying return periods (2, 5, and 10 years), durations (10 minutes and 1 hour), and spatial configurations (two distinct storm centers).