They carry large amounts of materials including a lot of silt (all this material is referred alluvium) forming a mud flow
As the water dissipates after the end of the storm and when its looses its energy upon reaching less steep slopes the alluvium is deposited to form fan shaped features at the base of the piedmont zone.
Desert piedmont zone
Is made up of water landforms formed by erosion, transportation and deposition.
The landforms found on the piedmont zone include: mountain front, bahada, peri pediment, playa and rock pediment.
The desert peidmont zone.
Features of a piedmont zone.
It is formed as a result of erosion along a steep slope and sometimes as a result of headward erosion.
It may also be a made up of large rock boulders resulting from weathering.
A depositional feature see above.
A sharp change in profile that marks the transition from the mountain front into a pediment.
It is the gentle slope that starts at the knickpoint at the foot of the mountain.
This may be made out of bare rock or it can be covered in alluvium deposited during floods.
It is made up of deposited material washed across the pediment.
The peri pediment is a depositional feature that is formed in the same way as bajadas but it is larger.