Rain retention ditch

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A rain retention ditch (RRG) is an open, elongated rain retention system in earthworks. This type of storage structure is suitable for the throttled drainage of rainwater from separation systems . Very long trenches can also be provided with throttling devices in order to increase the storage function.

Advantages and disadvantages

Advantages over rainwater retention basins are:

  • Rain retention ditches can be better integrated into a building area or into the landscape.
  • Narrow remaining areas or earlier drainage ditches can be used.
  • Due to the seepage , a considerable part of the rainwater can be fed back into the natural water cycle.

Disadvantages compared to rainwater retention basins are:

  • The space requirement is higher.
  • The entertainment expense is greater.
  • Rain retention ditches have to be built shallower in order not to take up so much space for embankments. This cannot always be implemented well in flat terrain with deep rainwater channels.

Technical rules

  • ATV worksheet A 166: Structures for central rainwater treatment and retention . November 1999.