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The main objective of this thesis is the development of a fast, stable and reasonably accurate numerical simulation method to predict and revisit flooding scenarios in the time domain. A comparison with the results of a standard benchmark model test and the re-investigation of the EUROPEAN GATEWAY, the HERAKUON and the ESTONIA accidents arc performed for validation purposes. The aim of the presented method is to fill the gap between simple hydrostatic stability evaluations and more sophisticated but time consuming sea-keeping simulation methods. The method is implemented in the ship design software environment E4, a first-principle ship design software used and developed at the Institute of Ship Design and Ship Safety of the Technical University of Hamburg together with partners from the German shipbuilding industry, among others the Flensburger Shipyard. This environment provides direct access to the complete ship data model and already implemented computational algorithms. Introduction; Theory and basic equations; Flooding of complex ship compartmentations; Violation with model test results; Accident investigations; Conclusion and outlook; Determination of Henry's constant; Derivation of the free outflow flux; Fill level averaging for free outflow.