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Report: San Juan River Watershed: 2011 Landslide Assessment Update

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Alan Chatterton of Chatterton Geoscience conducted a landslide assessment in 1996 to monitor the impact of logging on the landscape and downstream fish habitat. This report re-examines the same area 16 years later using 2011 orthophoto imagery to evaluate the changes over that time period.

Author:  Chatterton, A.

Date Published:  Jun 2012

Report ID:  35823

Audience:  Government and Public

In 1996 Chatterton Geoscience Ltd. completed a terrain study in the San Juan River drainage. The results of that study are summarized in a report to the San Juan Steering Committee entitled SAN JUAN RIVER WATERSHED Landslide, Gully and Terrain Assessment (Chatterton, A.N. 1996). A significant component of that study was to complete a landslide inventory in the watershed and to assess the relative potential for identified landslides to deliver sediment to fish habitat. In early 2012 Chatterton Geoscience Ltd. was contracted by TimberWest Forest Corporation on behalf of the San Juan Steering Committee to undertake a similar study of landslides in the watershed using 2011 high resolution digital photography of the watershed. The overall purpose of the 2012 study was to provide a retrospective view of San Juan drainage landslides over the last 16 years. This assessment found that the number of slides and their potential impact on fish habitat has decreased significantly since the implementation of modern logging and road-building practices. It also found that the high risk slides identified in the 1996 assessment are showing signs of rehabilitation, therefore decreasing in risk. 00000SANJ; 930-053800-00000-00000-0000-0000-000-000-000-000-000-000; Terrain Mapping

Report Type
  Terrestrial Information
  Biogeoclimatic Zone - CWH Coastal Western Hemlock Zone
  Region - Vancouver Island
  Terrestrial Information - Terrain Mapping
  Watershed Groups - 935 - Vancouver Island (West) Islands

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