The occurrence of flood events is a stochastic process. As logical consequence the potential damage can not be exactly determined. The calculation is based on available statistical data and is expressed as annual flood damage potential. Therefore the damage is weighted by the frequency of returning.
Assumption: The maximal damage is set as the upper limit of integration (recurrence interval T¥ = Tmax); the expected damage can only be calculated for events which probability of occurrence is more frequently than Tmax. The corresponding probability for this design event is Pmax As consequence the remaining risk cant be considered.
The flood damage potential is a function of flooded area, land use and water depth. It is summarized in the following formula: