A cistern overflow can be diversion or transfer

In the most common cases, cisterns are dimensioned so that they run to the brim at the latest during extreme precipitation and overflow further incoming rainwater. If the overflow is only expected exceptionally, an emergency overflow is sufficient. If a more frequent filling level of the cistern is to be expected or planned, the cistern overflow must be connected appropriately.

Emergency overflow

If you want to build a cistern overflow or hire a craftsman, make sure you install a siphon at the outlet. It fulfills two very important functions simultaneously: it serves as a small animal filter and as an odor barrier for your cistern.
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