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Developing a local flood alert system to help the urban community of Pointe à Pitre mitigate the impacts of floods
The Communauté d’Agglomération de Pointe à Pitre (CAP) territory is very prone to flooding, particularly in urban areas. The flooding events can be sudden and extremely violent. DHI has developed a flood alert system that contributes to timely decision making that can mitigate flood impacts.
Localised flash floodsThe CAP territory is subjected to different kinds of floods: coastal flooding, river flooding as well as overflowing of water networks. The sudden floods of May 2012 in several sections of Pointe à Pitre, more specifically in Les Abymes and in Gosier, were a reminder of the specific risks of floods in urban areas. Due to localised storms, the area suffered 313 mm of rainfall in only a few hours, equivalent to three months of rain at that time of year in the region. This sudden and high intensity rainfall caused a rapid rise of floodwaters in the city, with a water depth reaching 1.5 m to 1.8 m.
Urban floods in the CAP territory have various origins: runoff and collection of rainwater at the lowest point on road networks which are not connected to the storm drainage system, saturation or overflow of the storm drainage system. The rainwater sanitation master plan has revealed a network congestion during frequent heavy rainfall events which cause overflows on sections of Pointe à Pitre and Les Abymes occurred.
Localisation of flooding points and resource mobilisation are strategic organisational issues for CAP Excellence. The alert system developed by DHI has helped resolve these issues and increased the community’s efficiency in managing floods.
Early alert system for real-time flood forecastingThe forecasting and alert system set up by CAP Excellence covers the municipalities of Pointe à Pitre and Les Abymes in MIKE OPERATIONS.
The MIKE OPERATIONS forecasting platform integrates the MIKE URBAN modelling technology to model the storm drainage systems. The modelling of the hydrological response, which is the rainfall runoff transformation on river catchments, and the flow propagation in the network are thus integrated into the operating system.
With the MIKE OPERATIONS software, rainfall information is automatically collected and a simulation is launched each day. This system enables the user to predict the risks of the storm drainage system overflowing, and consequently, the risks of floods over a 24-hour period. The information is then transmitted to operators.
Modelling systemKnowledge about hydraulic operations is provided by MIKE URBAN. Characteristics of the system include:
Tasks are executed and results are obtained at 8 AM daily upon arrival of the CAP Excellence staff. The system uses weather forecast data provided daily by MeteoGroup, with hourly rainfall predictions over a 24-hour period.
Project value Flood management and employment of flood mitigation strategies is very important in dealing with extreme weather emergencies. Using our MIKE OPERATIONS software, we are able to provide CAP Excellence – a real-time forecasting system to alert the Guadeloupe on potential flood events in the city. We are able to do this by simplifying technical processes and identifying potential flood locations daily.
Real-time operation The forecast management system created by the MIKE OPERATIONS platform automatically launches simulations daily with results available at 8 AM. The system provides:
Real-time prediction of manhole overflowing over a 24-hour period
Dissemination of information through e-mail alerts and a dedicated website
Decision support system which increases the efficiency of CAP Excellence in flood management
Urban Community of Pointe à Pitre (CAP Excellence)
MIKE URBANMIKE OPERATIONS
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