Translations:Regenwassernutzung/231/en
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Rarely occurring heavy rainfall events can result in an overload of the respective drainage. The accumulated water cannot be properly released and a backup of water in the cistern occurs. Because of the possible repercussions on the storage, special attention must be made when designing a rainwater system for this situation. It must, in particular with connection to a mixed water system, that contaminated water is prevented from flowing from the sewer network to the storage.
