Post-wildfire debris flows typically occur in steep terrain that has been burned at moderate to high severity. These fast-moving flows of water, sediment (typically >50% sediment by volume), and debris can be extremely destructive. They can damage roads and infrastructure, wash away vehicles, f...
Since the 1960s, the Federal Emergency Management Agency (FEMA) has been charged with mapping and managing flood risk in the US. FEMA’s Special Flood Hazard Area (SFHA) defines the 100-year floodplain (or 1% annual chance of flood) and is the regulatory basis for floodplain management natio...