Commissioned by the Beijing Municipal Institute of City Planning and Design (BMICPD) in 2007, DHI China has conducted an urban flooding study of a 16 Km2 area, which covers many of the new facilities made for the Olympic Games 2008. DHI's MIKE FLOOD was used to analyse and evaluate the present storm water collection system against the original design criteria. Different measures, such as operation of pump stations, adjustment of pipe dimensions and introduction of rainfall utilisation facilities, were tested for a number of scenarios.
The study area included the Olympic Green, which holds some very spectacular buildings and facilities such as the 'Bird nest' (National Stadium), the 'Water Cube' (National Aquatics Centre), the Main Press Centre and the Olympic Village (the residential quarters for all athletes and team officials). Flood protection of these areas is accordingly an important and sensitive issue.
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| Site survey (Bird Nest) |
Water cube and bird nest |
Underground Road
Underground constructions have been built to accommodate transportation and commercial requirements in this area, which makes the drainage system even more complicated. The underground roads and tunnels may, in case of extreme rainfalls, be used as temporary storage facilities. The underlying surface varies , eg from saturated pavement to roof rainwater reuse facilities. MIKE FLOOD’s capability to include all these aspects makes it a unique and ideal tool for modelling and optimising complex urban drainage and water collection systems.
After simplification, the collection system consists of 1,652 nodes, 1,678 pipes, 18 pump stations and 5 man-made channels. Furthermore, the loop tunnel, underground road, rainwater reuse facilities and a man-made river were added to the model. This model was then coupled with the 2D surface flow model to simulate the interaction between manholes and surface, eg surcharge and water logging.
Flood near Beijing Olympic Village in 2007
The system's response to rainstorms (with return periods of 5, 20, 50 and 100 years) was simulated to identify the corresponding water loggings and mitigation measures were proposed. The model was also used to identify the bottleneck of the drainage system for rehabilitation purpose.
3D animations were made with state-of-the-art visualisation tools (Google Earth and MIKE Animator) and used as part of the reporting and final presentation to the client.
The project was coordinated by BMICPD. The Beijing Industry University and Beijing Hydraulic Planning and Design Institute took also part in the project, which started in August 2007 and was completed in March 2008.
The project has now been approved after a successful review made by experts from the evaluation committee, which included the Beijing Water Authority Bureau, IWHR and the Beijing Municipal Planning Association.
The client recognized the high quality of the project and intends to promote the further use of MIKE FLOOD as the modelling tool for future planning purposes within urban planning in the capital of China.
For further information about the project please contact Mr. Z.Yang at yzy@dhigroup.com or Ms. W. Wang at wwj@dhigroup.com.
For more information on MIKE FLOOD please contact Morten Rungø, Head of Urban products