Flood hazard
flat land area adjacent to a stream, composed of unconsolidated sedimentary deposits (alluvium) and subject to periodic inundation by the stream. Floodplains are produced by lateral movement of a stream and by overbank deposition; therefore they are absent where downcutting is dominant. Any erosional widening of one bank is approximately equalled by deposition on the opposite side of the channel in the form of bar development along the inside of meander bends. Thus, the simplest floodplain is made up of a strip of sinuous scrolls immediately adjacent to the stream.
The path that a stream follows is a channel.
stream channel
stream channel
Gravity pulls the stream channel downward.
this is called a meandering stream.
Channel
Gradient
The path that a stream follows is a channel.
Gradient
Sediment that is carried by a stream along the bottom of its channel.
The vertical drop of a stream channel over distance is known as the Gradient.