using Vegetated Riprap Techniques
DRAZDOFF PROPERTY PROJECT
Location: Thrums, British Columbia
Client: Columbia Basin Power Corporation
Objective: The objectives were to provide erosion
protection of the bank due to fluctuating water level
and to enhance and create fish habitat.
The Drazdoff property is located in Thrums, which is
within the Brilliant reservoir area east of Castlegar,
British Columbia. This vegetated riprap project was
built on 40 metres of waterfront along the Kootenay
River. This work was carried out for the Columbia Basin
Power Corporation in the spring of 2001.
Rick Rodman, P.Eng. of Klohn Crippen Consultants Ltd.,
produced the engineering design for the riprap. Paul
Grutter, B.Sc. Biological Technician of RL&L Environmental
Services Ltd., carried out the environmental monitoring
and fish habitat design. The vegetated riprap and riparian
planting was prescribed and implemented by Pierre Raymond
of Terra Erosion Control Ltd. A total of 27 pockets
of live cuttings, in conjunction with the placement
of riprap revetment, were installed. Each pocket included
9 cuttings, composed of three species; willow (Salix
spp.), black cottonwood (Populus balsamiffera ssp. trichocarpa)
and red osier dogwood (Cornus sericea).
The establishment of these riparian species will increase
fish habitat by creating shade and small organic debris
input into the Kootenay River. The site was monitored
during the summer of 2001 and 2002. The increased stability
of the bank is preventing further erosion. The survival
and growth is considered excellent.