Urban Pipe Network Drainage Capacity and Waterlogging Risk Assessment Based on Infoworks ICM Model
This paper uses the Infoworks ICM model to establish a drainage pipe network model for two rainwater districts in Lu'an City,and selects two measured precipitation data to calibrate and verify the model.The results show that the model is highly accurate.Six types of rainfall events with different return periods were designed,and the model was used to evaluate the drainage capacity of the pipe network and the risk of urban flooding in the study area.The results show that with the increase of rainstorm intensity,the proportion of overload of rainwater pipe network is increasing.Compared with the scenario of once-in-a-year,the proportion of overloaded pipelines in the scenario of once-in-20 years increased by 30.81%.Meanwhile,the flooded depth and area of the city in-creased.Compared with the scenario of once-in-10 years,the flooded area increased by 65.03ha in the scenario of once-in-20 years.Further analysis shows that it is affected by the smaller diameter of the rainwater pipe,the jack-ing of river water and low-lying terrain in the region.The assessment of the drainage capacity of urban rainwater pipe network and the risk of urban waterlogging can provide targeted suggestions during the construction and re-construction of urban rainwater pipe network.
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