Translations:Regenwassernutzung/161/en

Collecting

97 % of precipitation is derived from light rain events and should be collected

It is especially important to make sure that light precipitation, which provides 97 % of water quantity, is 100% collected. With a PURAIN filter for instance, this takes place in a single collection area. Only in this way can an effective overall efficiency of > 98% be achieved. In filters without such a collection area, light precipitation always flows though the same sieve area. As a result the area quickly becomes clogged and further light rain precipitation flows into the overflow.