Flood barrier systems consist of rails (angle brackets, which are installed next to the front door, for example) and dam beams, which are inserted into these rails. In the time of need this can be done quickly. The bottom of the dam bar has to be sealed. The suitability of the measure might be limited for risk reduction in case of heavy rainfall as they happen unexpectedly and suddenly. Operational readiness requires precautionary behavioural measures, training for quick activation and regular maintenance of the system.