Translations:Regenwassernutzung/142/en

Peak precipitation of rain events
In addition to the average annual precipitation and the seasonal distribution the consideration of short-term rain events is important for optimal dimensioning, particularly for pipes, rainwater filters and rainwater retention systems. Heavy rain events that occur approximately 4 to 10 times in a year, hardly contribute to water yield in most regions. For instance, heavy rain events contribute only about 3% of the total water yield in Germany. By contrast, light rain events provide about 97% of the water quantity. This knowledge is particularly important for the selection of an appropriate filter system.