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Flash floods and Urban flooding

Hamburg has introduced a separate rain water drainage system in recent years and introduced financial penalties, if rain water is not locally drained by home owners (2).

Adaptation strategies

The draft of the new Federal Water Act provides that in future rainwater must soak away locally, be used for irrigation, or be discharged into a body of water by means of drains kept separate from wastewater sewers. Provisions in bylaws may require the installation of non-return valves for building connections. It may also be necessary to modify sewage systems to prevent flooding (1).


The references below are cited in full in a separate map 'References'. Please click here if you are looking for the full references for Germany.

  1. Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (2009)
  2. Schlünzen and Bohnenstengel (2016)