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==Rainwater runoff==
 
==Rainwater runoff==
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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).
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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).

Aktuelle Version vom 9. November 2018, 13:00 Uhr

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Nachricht im Original (Versickerung und Retention)
==Regenwasserabfluss==
Die Berechnung des Regenabflusses geht von der Erkenntnis aus, dass starke Regenfälle von kurzer Dauer sind, schwache Regen dagegen länger anhalten. Die Regenspende nimmt bei gleicher statistischer Häufigkeit mit zunehmender Regendauer also ab. Der Zusammenhang zwischen Regenspende, Regendauer und Häufigkeit wird durch die statistische Auswertung von Niederschlagsregistrierungen ermittelt.
Im Allgemeinen wird in Deutschland das einfache  Bemessungsverfahren nach DWA-A 117 angewendet. Dafür ist ein statistischer Regen mit einer gewählten Dauer '''D''' und Häufigkeit '''n''' als Lastfall für die Bemessung heranzuziehen. Für die Ermittlung der Regenspende ist auf die „Starkniederschlagshöhen für Deutschland- KOSTRA“ (s. Beispiel Tabelle für einen Musterort) zurückzugreifen.
Übersetzung==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).

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).

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