Translations:Regenwassernutzung/162/en

Self-cleaning

3 % of precipitation is derived from heavy rain events and serves for the cleaning

Heavy rain events are suitably used for self-cleaning (discharge of leaves, etc. from the collection area). Heavy precipitation events, which occur about 4 to 10 times a year (Germany) and contribute only approximately 3% of the total water yield, clean out the collection areas of for instance the PURAIN filter using turbulence, the so-called "hydraulic jump".