Flood Simulation - Flood Hazard Maps

Click to enlarge - flooding, Bratislava (Slovakia)

The Flood Simulation service of EUROSENSE provides essential information for Flood Risk Management and decision support. Based on earth observation information, this service identifies flood-prone areas and potential impact of specific flooding scenarios (e.g. extreme events, dam failure). Through these simulations, EUROSENSE can deliver the necessary geo-information about water depth, flow velocity and flow direction to civil protection authorities.

EUROSENSE’s flood services and products meet the requirements of the EU Flood Directive. According to this regulation, EU Member States should prepare Flood Hazard Maps including information about historical flood extent, water depth (and/or velocity),… Historical or statistical hydraulic data are combined with topographic and land use information in a quasi-2D hydraulic simulation model using the ‘Manning equation’

Click to enlarge - flooding, Bratislava (Slovakia)

Several scenarios can be simulated:

Flash flood - A flash flood refers to a highly intense rainfall event or a sudden massive melting of snow. In areas with steep slopes with high runoff, this extreme precipitation amount causes a rapid increase of water volumes in the rivers and a fast rise of the water level. The water will then flow over the river banks and inundate the surrounding areas.

Plain flood - Rainfall during a long period and over an extended area can also cause floods. The water can cover large regions. Mapping this scenario of Flood Hazard reveals weaknesses of the rivers banks, illustrates where the water overtops the dikes and to which extent and how fast the flood will propagate. It also identifies the potential consequences when such an event affects urban highly populated areas and critical infrastructures.

Dike break - When a dike breaks along a river, water will instantaneously inundate the surrounding area. This case can be compared to the flash flood simulation. The resulting Flood Hazard simulations clearly show the water propagation through the streets. The customer can derive the water height along the river, the areas prone to flood risk and the precise time at which the water will reach specific critical infrastructures in the city.

Dam break - An increase of water pressure due to very fast filling of the reservoir can cause dam break incidents. When a dam breaks, a high amount of water is suddenly released. The speed of the water at the break point can be compared to the speed of a flash flood. The Flood Hazard simulations show the fast propagation of the water downstream and the consequent flood of cities and villages close to the river.