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Rainwater runoff
The calculation of rainwater runoff is based on the knowledge that heavy rains last short durations and low rains persist for longer. The rainfall yield declines at the same statistical frequency with increasing rainfall duration. The relationship between rainfall yield, duration and frequency is determined by the statistical analysis of precipitation registrations. Simple calculation methods in Germany are used in accord with DWA-A 117. For this a statistical rainfall with selected duration D and frequency n should be used as load case for calculation. For the determination of rain yield refer to the "amount of heavy peak rainfall in Germany - KOSTRA" (see table for a sample location).
