The modern development of a floodplain can be caused by natural river processes, human-induced changes to river systems, and climate change.
A floodplain may eventually form as a result of natural river processes such silt deposition, erosion, and channel migration.
Levees, dams, and other human-made changes to river systems, such as channelization, can alter the river's natural flow and result in flooding in places that weren't previously floodplains.
Climate change can lead to increased precipitation and extreme weather events, which can result in floods and the expansion of existing floodplains. It is possible for natural river processes like silt deposition, erosion, and channel migration to lead to the modern formation of a floodplain. Levees, dams, and other human-made changes to river systems, such as channelization, can alter the river's natural flow and result in flooding in places that weren't previously floodplains. Climate change can also contribute to increased precipitation and extreme weather events, leading in floods and the expansion of existing floodplains. Therefore, the modern development of a floodplain could be caused by any of the three causes.
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