👉 Valley fluid, also known as debris flow or mudflow, is a type of mass movement composed of a slurry of water and loose sediment that flows rapidly downslope, typically triggered by heavy rainfall or snowmelt. This fluid mixture consists of fine particles like clay, silt, and sand mixed with larger debris such as rocks and soil. Due to its high density and viscosity, valley fluid can travel long distances at speeds ranging from a few meters per second to over 30 km/h, causing significant erosion and deposition as it moves. These flows are common in mountainous and hilly regions with steep gradients and can pose substantial hazards to infrastructure, vegetation, and human settlements.
