Flow processes acting on the flood propagation in water bodies (2)

For no flow inundation areas the retention can be easily assessed. But in general on floodplains flow still occurs and returns back to the river through momentumexchange or transverse flow at converging flood plains. As the flow velocity varies in space and time considerably the retention effect can not be easily evaluated or determined for natural rivers. Often the retention effect in natural rivers is overestimated. Pasche/Plöger (*1) demonstrated that just the widening of flood plains and the meandering of the main channel does not give a substantial attenuation of the flood peak although these measures have led to higher water depth and larger inundation volume.

Effect of the widening of flood plains and the meandering of the main channel on the flood attenuation

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Module
Hydrology of Floods
Source

TUHH

References

*1 Pasche/ Plöger (2004)

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