Based on SCALGO Flash Flood Mapping, the major Danish engineering, environmental science and economics consulting company COWI successfully launched the new flash flood map product “Skybrudskort®” in Denmark. The product maps regions that are likely to be below water during an extreme rain event. It is based on a COWI-produced national LIDAR-based terrain model specifically conditioned for hydrological simulations by COWI’s hydrology experts, along with SCALGO computation consulting services.
A consequence of extreme rain events where the sewer system is exhausted and the ground is saturated with water is that water gathers in depressions of the terrain. This can have catastrophic effects on housing and other assets within the depressions. SCALGO Flash Flood Mapping, which forms the basis of COWI Skybrudskort®, shows how much rain has to fall before any given part of the terrain is below water. Consequently, the mapping can be easily used to compute what part of each depression is below water after a given amount of rain, and thus effectively shows how water collects in depressions for all possible amounts of rain. This way the COWI Skybrudskort® product is a significant improvement over previous “bluespot” map products that show all depressions that are not contained within other depressions, corresponding to only computing what part of the terrain is below water after an “infinite” amount of rain.
Skybrudskort® has already been purchased by several local governments as well as one of the five regional governments in Denmark (covering approximately 13.000 km2). Using a nationwide 2-meter resolution raster terrain model containing 26.8 billion cells, COWI and SCALGO are currently producing Skybrudskort® for the entire country of Denmark (approximately 42.000 km2). View more Success Stories or find out more about SCALGO Flash Flood Mapping.
SCALGO Flash Flood Mapping result showing parts of the terrain below water for 50mm (red), 100mm (yellow) and 150mm (blue) of rain, respectively.