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...
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...