Back flow valves
Back flow or closing valves are connected to the piping system and close in case of back flow. Valves needs to be cleaned regularly.
Check out the RAINMAN good practice examples:
no good practice example available
READ MORE:
- Hamburg Wasser (Ed.) (2012): Wie schütze ich mein Haus vor Starkregenfolgen?: ein Leitfaden für Hauseigentümer, Bauherren und Planer [How do I protect my house from the effects of heavy rain?: a guide for homeowners, builders and planners], URL: http://www.hamburg.de/contentblob/3540740/data/leitfaden-starkregen.pdf (20.03.2020): Rückstauverschluss
Sabine Scharfe, Saxon State Office for Environment, Agriculture and Geology