Floodplain processes


A floodplain is that part of an alluvial plain that would be naturally flooded in the absence of engineered interventions.

Floodplain (1% and 0.1%) identifies land which is potentially vulnerable to floods of a particular magnitude. Replacing older terms relating to 1 in 100 and 1 in 1000 year floods, the 1% and 0.1% floodplains refer to land which in any one year has that likelihood of flooding.


The variety of natural processes being encountered in a floodplain are exemplarily referred in the schematic figure of Anderson et al. below. These processes, if they are to be represented in a numerical model, require representations in terms of physical laws. If these are not available, empirical data may serve for the description of the responds pattern, e.g. erosion as consequence of intensive flood flow.

Structures and phenomena requiring to be considered in hydrodynamic simulations (Anderson et al., 1996.)

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