RIVER DEPOSITIONAL
LANDFORM PART 1
The land on either side of the river
into which the river floods. (Middle
& Lower course)
Bluff line- this line marks the outer edge of
the river channel as the river floods.
Floodplain
BL
BL
B
Keys:
River banks-B
Bluff lines -BL
River bed
Levees- this is built up
on either side of the
river channel as the
river floods.
B
Alluvium -fine eroded material deposited at
times of flood. This can improve the fertility
of the soil. It consists of silt, sand,
clay, and gravel, & organic matters.
Floodplain flooded
River channel
Floodplains
Floodplains
Stages in formation of a floodplain & Levees
1. Normal flow of a river
before flood occur.
Bluff line
Bluff line
2. During heavy rain the water
in the river channel rises until
it reach bankful stage.
Levees
3. As it continue to rise it
overflow and flood onto
surrounding floodplains until
It reaches the bluff lines.
At time of flood coarser material which are heavier and coarser material will be deposited first at both edge of rive banks.
Repeated flooding, more and more coarser material such as pebbles, gravel even boulders will be deposited forming raise river
banks called levees. Finer materials such as clay and silt will be transported further away from the channel and deposited
on the floodplain.