Arid Regions

Arid regions block water due to local (Rainshadow) or global (Low Pressure, 30� N&S) weather patterns.

In arid regions, water is still the dominant erosive force.

Soils in arid areas are hard-baked, so when it does rain, the soil doesn't absorb water into its pores.

Overland flow fills "Wadis", which are one-day creek beds, fill up rapidly during desert rainstorms

These Wadis end as quickly as they began, and leave behind deposition features like:

Alluvial Fans: Delta like deposits in Desert valleys.

Flayas: Salt bed deposits when water evaporates in deposition.