Abstract: “Mudflow is one of the natural disasters that frequently happen in Indonesia. This flow-type of landslide occurs suddenly and moves very fast, so it can cause massive damage and loss. However, knowledge about this disaster's behavior is minimal, even though it poses a huge destructive threat. Assessment from twenty case studies is done to understand more about mudflow behavior. High plasticity silt is the soil type most likely to become mudflow. The sediment concentration by volume value for mudflow is in the range of 0.29–0.56. Eight relationships between mudflow parameters were obtained: the steeper the slope, the greater the flow distance; as the liquidity index increases, the viscosity and yield stress value will decrease; the higher the viscosity, the greater the flow width; More volume moves from sources to deposition areas over longer flow distances; as flow rate increases, flow duration decreases; the deeper the flow depth, the shorter the flow duration. Lastly, a wider flow w”

Keywords: duration, flow depth, landslide, mudflow, viscosity, yield stress