Translations:Regenwassernutzung/208/en

Yield << Requirement
Tanks with smaller dimensions are preferred when the rainwater yield is permanently much lower than the non-potable water requirement. In this case, a tank volume of 3% of the average annual rainwater yield is sufficient. If there is low yield, then it should be initially checked whether other roof areas (e.g. neighbouring buildings) can be connected to the system. If this is not possible, then it may be appropriate to connect only some of the consumption points to rainwater harvesting to reduce the necessary drinking water backup.