Sediment Control using
Various Types of Sediment Traps
BUSK CREEK LANDSLIDE PROJECT
Location: West Arm Demonstration Forest, Nelson,
Client: Kootenay Lake Forest District
Objective: To re-establish drainage patterns
on the roads affected by the slide and to stop sediment delivery to Busk Creek. To distribute run-off drainage
to avoid further surface erosion and degradation of
the site and to re-establish native vegetation.
During ‘breakup’ of 1997, a debris avalanche
swept across the Busk Creek forestry road, divided it
into two channels, crossed the main Kokanee Park access
road and ran into Busk Creek, a tributary to the Kokanee
Creek spanning channel. The distance from top to bottom
was about 640 meters. The estimated area affected by
the event was 0.8 ha.
A significant quantity of unconsolidated material entered
Busk Creek, including soil materials, rocks and gravel,
and organic debris, creating a major sediment source
in the Kokanee Creek watershed. In early summer of 1998,
mudflow deposits again obstructed the park road. In
November 1998, an assessment of the site and preliminary
remediation plan was developed by William H. Wells,
P. Ag. Consulting and Alan Davidson, P. Ag. Earth Science
Specialist of Kootenay Lake Forest District in collaboration
with Terra Erosion Control Ltd.
Terra Erosion Control Ltd. carried out this erosion
control work in November 1999. The prescription included
three types of treatments in order to compare their
1) conventional soil bioengineering structures, 2)
sediment traps using dead materials (logs, rocks, re-bar,
geotextiles, and straw bales), and 3) a combination
of both, where live willow cuttings were incorporated
with soil and straw flakes within the sediment traps.
Drainage improvement and structural reconstruction
work was completed upslope of the slide’s initiation
point, therefore significantly reducing further failures.
Follow- up assessments began early in 1999 to monitor
the effectiveness of the treatment and to identify the
necessary repairs and maintenance. Fill-in erosion control
seeding was later undertaken.
Optimally, reviews and monitoring of the entire project
are undertaken annually. This road and its effect on
the hydrology of this landscape unit have a close relationship
to the stability of the slopes and the successful rehabilitation
of the landslide.