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This layer depicts areas designated as Landslide Hazard and Erosion Hazard (see Chapter 4 of Critical Areas Code). It is advisory and subject to verification in the field.
The Critical Areas Ordinance defines Landslide hazard both as landforms (bluffs and ravines), and applying slope and soil criteria. The original data set was created from 1:24,000 USGS topography (40’-50’ contours), Clallam County Soil Survey, and Coastal Zone Atlas by county staff in 1996. Partial Landslide re-mapping in areas of LiDAR coverage was done (December 2010 through January 2011).
The 2011 update more accurately reflects the landform-based landslide hazard in areas with LiDAR coverage. However, it inherits the original shapes for most slope/soil based hazard areas, and areas with no LiDAR coverage, pending more sophisticated slope analysis and policy decisions.
The 2011 update was done by visual inspection of contours, hillshade, and a derived slope layer (65% and above), all from LiDAR, as well as aerial photos. The focus was on marine bluffs, as well as bluffs and ravines along major stream systems, particularly those included in the Shoreline Master Program update process.
This layer depicts areas designated as Landslide Hazard and Erosion Hazard (see Chapter 4 of Critical Areas Code). It is advisory and subject to verification in the field.
The Critical Areas Ordinance defines Landslide hazard both as landforms (bluffs and ravines), and applying slope and soil criteria. The original data set was created from 1:24,000 USGS topography (40’-50’ contours), Clallam County Soil Survey, and Coastal Zone Atlas by county staff in 1996. Partial Landslide re-mapping in areas of LiDAR coverage was done (December 2010 through January 2011).
The 2011 update more accurately reflects the landform-based landslide hazard in areas with LiDAR coverage. However, it inherits the original shapes for most slope/soil based hazard areas, and areas with no LiDAR coverage, pending more sophisticated slope analysis and policy decisions.
The 2011 update was done by visual inspection of contours, hillshade, and a derived slope layer (65% and above), all from LiDAR, as well as aerial photos. The focus was on marine bluffs, as well as bluffs and ravines along major stream systems, particularly those included in the Shoreline Master Program update process.