Sigma Engineering Hydropower and Water Resource Engineering Consultants

Environmental Project Experience

McKnight Creek Environmental Impact Assessment

(Synex International Ltd)

Baseline studies were conducted in the McKnight Creek watershed, south of Prince Rupert, to document fish and fish habitat as well as wildlife and water quality. Data collected was analyzed and presented in support of a Water Licence application. Impacts related to the diversion of water for hydro power purposes were identified and appropriate mitigation measures presented.

Golden Bear Mine – Ursa Expansion Baseline Fisheries Study

(Steffen, Roberston, and Kirsten (SRK) Canada Inc)

Baseline studies related to fish, wildlife, water quality and hydrology were carried in Sam Creek, northwest of Dease Lake, BC, to provide background data in support of a mine expansion application. Field activities included fish sampling, habitat surveys, water quality measurements and sampling and flow measurements.

Brown Lake Project

(Synex Energy Resources Ltd)

Multidisciplinary environmental impact assessment, impact management plan, and approvals for a 6 MW hydroelectric development near Prince Rupert, BC. The project continues with ongoing baseline studies, construction and impact monitoring, mitigation recommendations and permitting issues.

Salmo River Inventory and Assessment

(Columbia Basin Fish and Wildlife Compensation Program)

A baseline inventory and assessment of fish and fish habitat was conducted in the Salmo River and its main tributaries. In addition, the study involved an evaluation of a coarse fish barrier, a cursory assessment of the sport fishery, and documentation of existing and future land use impacts. The study examined factors limiting the salmonid population and identified potential enhancement/restoration opportunities.

Squamish River Fall and Winter Flow Ramping Studies: Fish Habitat Use and Stranding Assessment

(BC Hydro, Corporate Safety and Environment)

Fish habitat use studies and water level monitoring were conducted in fall, winter and spring to document stage changes that resulted from the Cheakamus Generating Station. The stage change data were correlated to the fish habitat use data to identify patterns of fall and winter fish stranding and pothole trapping and to provide operating recommendations to reduce stranding potential.

Biophysical Inventory and Identification of Enhancement Opportunities in Archibald Creek, Whistler

(Taina Developments Corporation)

A biophysical inventory consisting of fish sampling and completion of FHIIP Stream Survey Forms was conducted. The species of interest was rainbow trout which was anticipated to be the main sport fish species. The report included identification and prioritization of enhancement opportunities, and an assessment of potential bridge construction impacts.

Revelstoke Reservoir Culvert Assessment

(Columbia Basin Fish and Wildlife Compensation Program)

Investigation of Revelstoke Reservoir drainages to determine fish presence and fish passage problems at road crossings, and prescribe follow-up measures required to plan or undertake remedial actions.

Fish Flow Overview Study

(BC Hydro, Environmental Resources)

Assistance with research for and preparation of an overview report on existing and potential impacts of all BC Hydro hydroelectric facilities on fish and aquatic habitat.

Spillimacheen River Fish and Fish Habitat Studies

(BC Hydro, Environmental Resources)

Assessment of effects of undersluice opening on aquatic habitat and assessment of fish and fish habitat in lower Spillimacheen River, tributary to upper Columbia River.

Shuswap River Flow Availability

(BC Hydro)

Engineering design, environmental assessment, and approvals for the diversion of a portion of the flows from McKnight Lake into the nearby Brown Lake reservoir via a lake intake, 420 metre long tunnel and 1,200 metre long pipeline.

Fish Assessment of the Clayton Falls Creek Hydro Plant Expansion

(Synex Energy Resources Ltd)

Assessment and design of tailrace/spawning channel for 2 MW hydroelectric plant near Bella Coola, BC.

Quinsam/Ladore Diversions Project

(BC Hydro, Resource Smart Program)

Study of alternatives for increasing flow through 3 hydro plants on the Campbell River. Included efficiency improvement study and recommendations to alter operating regime.

Clayton Falls, Bella Coola

(Swift Power LP)

Design and project management of 1300 kW addition to an existing BC Hydro facility as an independent power project.

Iskut Hydro Power Project

(International Skyline Gold Corporation)

Preliminary studies of the 18 MW project to serve a proposed mine in northwestern BC. Work included hydrological studies, and hydraulic studies and preliminary designs to address high seasonal sediment loads in addition to developing general project arrangements and producing a project cost estimate.

Surprise Lake Hydro Project

(Atlin Power Corporation)

Feasibilty study for a proposed 7 MW hydro project in Atlin, BC.

Yongnian Cogeneration Project

(Synex Noram Power Corporation)

Technical review and preparation of the power supply and heat purchase contracts for this 24 MW coal fired project located in Hebei Province, China.

Sechelt Creek Hydro Project

(CRG Projects)

Contractor’s Design Engineer with responsibility for detailed design of the 4,300 metre long, 1.5 metre diameter welded steel low and high pressure penstock which included powerhouse bifurcation, two pipe bridges, thrust blocks and appurtances for this 16 MW design-built project.

Export Energy Projects

(Western Pacific Powergen Corp)

Project identification, hydrology, environmental studies, preliminary design of several hydro projects up to 40 MW in size.

Cheakamus and Clowhom Plant Evaluations

(B.C. Hydro)

Use of Small Reservoir Operations Model (SROM) to examine optimization of the operation of the Cheakamus and Clowhom Generating Plants under proposed changes to the plant operating conditions.

Cheakamus and Clowhom Plant Evaluations

(B.C. Hydro)

Use of Small Reservoir Operations Model (SROM) to examine optimization of the operation of the Cheakamus and Clowhom Generating Plants under proposed changes to the plant operating conditions.

Squamish River Flow Ramping Study

(B.C. Hydro)

Hydraulic analysis of the Squamish River to examine the effect of changing discharges from the Cheakamus Generation Station on the stages and rate of change of stage of the Squamish River.

Silbak Hydro Power Project

(Westmin Resources Limited)

Project evaluation, preliminary design and portions of the final design for a 7 MW hydro power project serving a mine and the community of Stewart, BC.

Whatshan Lake, Falls River and Clayton Falls

(B.C. Hydro)

Preparation of operation and maintenance manuals for dams and penstocks at three facilities ranging in size from 700 kW to 50 MW.

Moses Inlet

(Synex International and Crown Forest Industries Ltd)

Turn-key development and construction financing of a 75 kW power plant serving a 70 man logging camp. The plant works were leased to Crown Forest Industries Ltd.


(Synex Energy Resources Ltd)

Evaluation for the purchase of a utility based on diesel generation to serve a 600 kW load. Eventually the utility was purchased by an affiliate and operations management and planning services are provided.


(Synex Energy Resources Ltd)

Evaluation of power supply alternatives, development of project financing, design, and construction of a 50 km powerline distributing 25 kV to two industrial customers.

Energy, Mines and Resources Canada

Historical review and assessment of small hydro sites in British Columbia.

BC Ministry of Energy, Mines, and Petroleum Resources


Assessment of small hydro power resources in BC, including evaluation of technical and financial feasibility.