Following a wildfire, the likelihood of occurrence of landslides, erosion, floods and snow avalanches within or downslope of the burned area can increase. The degree of hazard increase depends on various factors including the burn area, vegetation burn severity, soil burn severity, development of water-repellent soil, slope attributes, local hydrology, and local geomorphic conditions. The trigger for an event is often a significant high intensity rainfall. Elevated landslide and flooding hazards are both short-term (3 to 5 years) and long-term (until full forest regeneration). Short-term hazards relate to soil burn severity, development of water-repellent soil layers, increased overland flows, and sediment bulking. Longer-term hazards relate to increased Equivalent Clearcut Areas (ECAs) as a result of loss of overstory and possible effects of loss of tree root strength. (Springer Creek Fire Number 50372 - Post-Wildfire Analysis, 2007)
The following links lead to more specific information regarding post wildfire hazards in the Regional District of Central Kootenay:
One of the most devastating events in the RDCK occurred in Johnsons Landing on July 12, 2012 when a landslide tore through the community, taking the lives of four people and destroying four homes. A portion of the area remains under a Declaration of a State of Local Emergency.
The following PDF links provide further information on the Johnsons Landing Landslide:
Full Landslide Report [PDF - 47.8 MB]
Landslide Hzard Zone - Map [PDF - 2.1 MB]
Snow Avalanche Risk Zone Mapping [PDF - 2.5 MB]
The content on this page was last updated November 14 2018 at 12:29 PM