Modelling and Application of Urban Drainage Based on Mike Urban Model

To alleviate the drainage pressure of urban pipeline network and reduce flood disaster, for the problem of non-convergence of design standards caused by inconsistency of design rainstorm duration between urban construction and water conservancy departments, this paper takesa residential district in Wenzhou City of Zhejiang Province as an example, andanalyze the relationship of recurrence periods between pipeline network drainage and waterlogging drainage under the regulation and storage capacity of rivers. Mike Urban was used to establish the drainage model of pipeline network to simulate the drainage situation when facing different river water levels at the outlet. The results are as follows: (1) when the recurrence period of pipeline design is 1 year, 3 years and 5 years respectively, the corresponding design rainstorm recurrence period of waterlogging drainage is about 5 years, 15-20 years, 20-30 years; (2) when meeting the high the water level at the outlet, the once a year rainfall of pipeline network encountering is equivalent to that of the pipeline network encountering the once a year to once in three years rainfall when the water level of the outlet is constant; (3) when the water level at the outlet is high, the once in three years rainfall of the pipeline network encountering is equivalent to that of the pipeline network encountering the once in three years to once in five years rainfall when the water level of the outlet is constant. Relevant research can provide reference for the design standard of pipeline network.