This paper aims to analyze the flood hazard in the city of Monza, which periodically suffers from overflows from both the river Lambro and the urban drainage system during wet weather conditions. A unified Urban Flash Flood Model of Monza is therefore developed to capture both sources of hazard. The model is first validated by comparing the results of simulations with historical data related to the area of Monza, then is exploited to obtain maximum flood depth and velocity maps for three different return periods. Overall, the results show the different nature of the flood-related hazard and the sewer-related hazard: the former is concentrated across the rivers whereas the latter spreads patchy over the territory. Furthermore, the former features much larger water levels and flow velocities, which result in more serious hazard to citizens.

本文旨在分析蒙扎市的洪水灾害，该市在潮湿天气条件下会定期遭受兰布罗河和城市排水系统的溢洪影响。因此，开发了统一的蒙扎城市暴洪模型，以捕获两种危险源。该模型首先通过将模拟结果与与蒙扎地区有关的历史数据进行比较进行验证，然后用于获得三个不同返回期的最大洪水深度和速度图。总体而言，结果表明，与洪水有关的危害和与下水道有关的危害具有不同的性质：前者集中在河流之间，而后者则分散在整个领土上。此外，前者具有更大的水位和流速，从而对公民造成更大的危害。