A floodplain is the area of flat land adjacent to a river, creek, lake, estuary, dam or artificial channel which is subject to flooding during high rainfall periods. It is considered that such land is not financially feasible to be protected against flooding.

A floodplain has two main functions:

  • temporary storage to attenuate flood effects, and
  • an expanded flow path

Increasing urbanisation reducese the effectiveness of the floodplain's functions.

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