Alluvial cone

Hydrocompaction may occur on alluvial cones. The dried surface layer of these cones may contain many voids. Percolating water frequently reduces the strength of the material that, in turn, reduces the void space. This gives rise to settlement or hydrocompaction. 

Alluvial cones are found along valleys located at the foot of mountains. They are poorly stratified and contain rock debris with a predominantly angular shape and great variety in size. 

---