Research and practice of key technologies for urban waterlogging risk impact assessment

Due to global climate changes and frequent extreme rainfalls, it is necessary to assess drainage and flood prevention system in combination with urban physical examination． Here multi-source data of land and space, such as the geographical national conditions survey, are used to establish a method to assess the following: waterlogging risk level, impact of water accumulation and waterlogging economic loss in the drainage and flood prevention system． These methods and models are applied to a District designated S in Beijing, to prove the accuracy and reliability of the method． These methods can be used in urban physical examination, and be fed back to land spatial planning and urban construction．