CGRG Bibliography of Canadian Geomorphology
Search Results
Author : Alcock, J.
Date : 2002.
Title : Mass wasting events associated with a large magnitude rain-on-snow event, November 1999, Columbia and Rocky Mountains, Southeastern B.C.
Publication : Terrain Stability and Forest Management in the Interior of British Columbia: Workshop Proceedings. May 23-25, 2001 Nelson, British Columbia, Canada. Edited by: Jordan, P.; and Orban, J. British Columbia Ministry of Forests Forest Sciences. Technical Report
Issue : 003:
Page(s) : 214.
Abstract
In November 1999, a large magnitude rain-on-snow event occurred in the Kootenay Region of B.C. In the Columbia Forest District, tens of debris flow, water erosion and other mass wasting events occurred. Many of the in-block debris flows, water events on pre-and post-code roads, and natural events were investigated and site-specific causes determined. Generally, the mass wasting and water erosion events generated by the rain-on-snow were different than typical spring snowmelt-caused events. Surface and subsurface drainage volumes were often beyond ditch and culvert flow capacity. Surface water flow occurred in new, untested locations. Debris flows occurred in the uphill portions of cut blocks and in reactivated gully wall failures. Ice and slush avalanches were observed in alpine areas. This major precipitation event served to pinpoint the locations of inadequate drainage structures and unstable sidecast and road gully fills. The adequacy of drainage structures in new and disused forestry roads is evaluated. The effects of snowpack distribution, cutblock boundaries in relationship to terrain stability polygons and other factors are discussed.
Bibliography of Canadian Geomorphology