The Tsitika River Project, Campbell River Forest District


 

Background

The Tsitika River Sediment Project began in 1991 to respond to concerns that sediment from the Tsitika River might adversely affect the killer whale rubbing beaches at Robson Bight Ecological Reserve. The initial objective for the project was to construct a sediment budget for the entire Tsitika River watershed and use it to determine the amount of sediment originating from forestry related activities.

Hydrometric stations were established at Russell and Catherine Creeks and were intended to represent logged (Russell) and unlogged (Catherine) sub-units at the scale of the Tsitika River watershed. Turbidity probes and sediment sampling equipment were added to the existing Water Survey of Canada station at Tsitika River below Catherine Creek. It was soon demonstrated that ocean currents carried sediment plumes from the Tsitika River away from the rubbing beaches. Despite this, concerns remained over forestry impacts on fisheries values within the watershed, thus research continued with a focus on creating sediment budgets within Russell and Catherine Creek watersheds.

Catherine Creek is entirely underlain by the basaltic Karmutsen Formation, whereas Russell Creek is dominated by granitic bedrock with only the upper 1/3 of the watershed in the Karmutsen. This made them unsuitable to act as paired watersheds, but provided the basis for comparative analysis of sediment production from the two bedrock types. It was decided that sediment budgets would be constructed for Russell and Catherine Creek watersheds separately, beginning with Russell Creek. In 1996 Forest Renewal BC (FRBC) funding was obtained for a period of three years for sediment budget research. The first year of this project was spent installing the monitoring sites and the storm sampling program, while the second and third years were spent primarily in data collection and analysis. The program was further extended under funding from the Forest Investment Account (FIA) from 2001 – 2003 to develop a sediment budget model.

Beginning in 2003 research within the Tsitika Watershed switched focus entirely on Russell Creek watershed. In co-operation with the University of British Columbia’s Forest Resources Management department, research began on subsurface preferential flow pathways at the hill-slope scale. In 2005 the meteorological station network within Russell Creek was expanded to examine the spatial variability of precipitation and temperature within the watershed. In addition, work began on a study to assess the role of interception recovery in the rain-on-snow zone of the watershed.

The overall purpose of continuing research within Russell Creek watershed is to determine the effects of forest harvesting on water quality and quantity. Completion of current projects, specifically related to sub-surface flow and canopy interception will be used in the creation of a physically based hydrological model. Model development is on-going, but when completed it will serve as a tool to aid in forest management decisions.

Click here to view the Russell Creek watershed with snow lysimeter and meteorological station locations.

 
 
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Objectives

  • To determine the effects of contemporary forest management on sediment delivery to surface water;
  • To determine the effects of forest harvesting on peak flows in a watershed dominated by rain-on-snow events;
  • To maintain current infrastructure for long term monitoring of stream flow and climate.
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Publications

Technical Reports

Interpreting Turbidity and Suspended-Sediment Measurements in High-Energy Streams in Coastal British Columbia.

Storm based sediment budgets in a partially harvested watershed in coastal BC.

Comparative analysis of sediment production in two partially harvested watersheds in coastal BC.

Effects of forest harvesting and regeneration on peak streamflow in a Coastal watershed.

  • Disclaimer:Limitations of results and their application.

    An operational method of assessing hydrologic recovery for Vancouver Island and south coastal BC.

    Extension Notes

    Alternative methods of flow rating in small coastal streams.

    Road construction and hauling in basaltic and granitic terrain: effects on sediment yield at Russell and Catherine Creeks, Tsitika River Watershed.

    Russell Creek: summary of research and implications for professional practice.

    Recent Presentations

    Hrachowitz, M., W. Floyd, R. Hudson, A. Anderson, R. Bhattrai, Y.Alila, M.Weiler. 2005. (Poster). A New Experimental Setup in a Rain-on-Snow Dominated Watershed to Improve Subsurface, Rain-on-Snow and Hydrological Recovery Modeling on Various Scales. Hydrology for the Orographically Challenged: A Workshop on Predictions in Ungauged Basins (PUB) in Mountainous Regions. Hosted by the BC Branch of the Canadian Water Resources Association, Environment, and Canadian Society for Hydrological Sciences November 28-30, 2005 Manning Park, BC.

    Anderson A. and M. Weiler. 2005. How do preferential flow features connect? Combining tracers and excavation to examine hillslope flow pathways. American Geophysical Fall Meeting. The Moscone Centre West, San Francisco, California, Dec 5-9, 2005.

    Floyd, W., R. Hudson, M. Hrachowitz, M. Weiler, Y. Alila. 2005. (Oral Presentation) Recovery of stand-level hydrologic processes following forest harvesting in coastal watersheds: Developing and testing an empirical model. Annual Meeting of the Canadian Geophysical Union. The Banff Center , Banff Alberta, May 14-17, 2007.

    Hrachowitz, M., R. Hudson, W. Floyd, M. Weiler and Y. Alila. 2006. (Oral Presentation). The sensitivity of rainfall based runoff models to network density. Annual Meeting of the Canadian Geophysical Union. The Banff Center , Banff Alberta, May 14-17, 2007.

    Floyd, W. and M. Weiler, 2007. (Oral Presentation). Snowfall monitoring with a remote camera network. CMOS-CGU-AMS Joint Congress: Air, Earth, Ocean and Ice on the Rock. St. John’s, NFLD, Canada, May 28-June 01, 2007.

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