Stave Falls Dam

Stave Falls Dam

Interior of the original Stave Falls power house
Location of dam in British Columbia, Canada
Country Canada
Location Stave Falls
Coordinates
Status Operational
Construction began 1909
Opening date 1912
Owner(s) BC Hydro
Dam and spillways
Length 122 m (400 ft)
Blind Slough Dam: 190 m (623 ft)
Crest width 5 m (16 ft)
Blind Slough Dam: 8.5 m (28 ft)
Crest elevation 83.75 m (275 ft)
Impounds Stave River
Spillways 2
Type of spillway Sluice/Tainter gate controlled
Spillway capacity 3,500 m3/s (123,601 cu ft/s)
Reservoir
Creates Stave Lake
Capacity 470,000,000 m3 (381,035 acre·ft)
Catchment area 1,170 km2 (452 sq mi)
Surface area 62 km2 (24 sq mi)
Normal elevation 82 m (269 ft)
Power station
Owner(s) BC Hydro
Commission date Original: 1911
New: 2000
Turbines 2 x 45 MW Kaplan turbines
Installed capacity 90 MW
Annual generation 362 GWh

Stave Falls Dam is a dual-dam power complex on the Stave River in Stave Falls, British Columbia, Canada . The dam was completed in 1912 for the primary purpose of hydroelectric power production. To increase the capacity of Stave Lake, the dam was raised in 1925 and the Blind Slough Dam constructed in an adjacent valley to the north. In 2000, the dam's power station was replaced after a four year upgrade. The power station was once British Columbia's largest hydroelectric power source and is a National Historic Site of Canada.[1]

Contents

Background

The Stave Falls Dam was first visualized in the 1890s as hydroelectric development was becoming widespread. Exploiting the 24 m (79 ft) drop of the Stave Falls could produce hydroelectricity which could be sold to various customers. In 1895, Stave Lake Electric and Power Co. Ltd was given permission to study the falls for electricity production. In 1909, the Western Canada Power Company bought Stave Lake Electric and Power and began construction on the dam.[2] The first generator went online in December 1911 and the second in January 1912. Generators three and fourth went online in 1916 and 1922, respectively.[3] In 1921, British Columbia Electric Railway bought Western Canada Power and continued to develop the power power plant. A fifth generator was installed after it was realized that additional water from a dam raise and a reservoir created by the Alouette Dam could increase power production.[2] The Stave Falls Dam was raised in 1925 and the fifth generator was operational on 19 September 1925. In 1926, the Blind Slough Dam was completed to supplement the reservoir's new size and serve as a spillway. In 1928, the Alouette Dam was complete.[3]

Beginning in 1995, the original power station underwent decommissioning and was replaced with a new power station containing two Kaplan turbines. The project included the construction of a new power plant intake, power house, tailrace channel and penstocks. It was completed in January 2000 and increased the installed capacity of the power plant from 52.5 MW to 90 MW. The old power station currently serves as a tourist attraction.[3]

Design

The Stave Falls Dam is a 122 m (400 ft) long concrete-gravity and rock-fill dam with a crest width of 5 m (16 ft). The Blind Slough Dam, 400 m (1,312 ft) to the north, is a 190 m (623 ft) long concrete-gravity dam with an 8.5 m (28 ft) wide crest. The Blind Slough Dam serves as a spillway which consists of 10 tainter gates and 4 sluice gates. It has a maximum discharge of 3,500 m3/s (123,601 cu ft/s).[4]

The dam's current power station contains two 45 MW Kaplan turbines and generators for an installed capacity of 90 MW. Unit one receives water from a 183 m (600 ft) long tunnel while that of Unit two is 202 m (663 ft) long.[4] The old decommissioned power station at the base of the Stave Falls Dam contains five horizontal double-Francis turbine-generators. Included are three exciters, two of which were once driven by smaller Francis turbines. Generators 1 through 4 used two exciters while generator 5 used its own. The penstocks for generators 1 through 4 had a 4.2 m (14 ft) diameter and were 45 m (148 ft) in length.[3]

Operation

The Stave Falls Dam is part of the Alouette-Stave Falls-Ruskin Hydroelectric Complex. Supplementing Stave Lake is water from Alouette Lake which is created by the Alouette Dam at , 11.5 km (7 mi) northwest of Stave Falls Dam. A 1,067 m (3,501 ft) long tunnel connects Alouette Lake and Stave Lake. At the end of the tunnel is a penstock which feeds an 8 MW power station on the edge of Stave Lake at . Water released from the lake flows into Hayward Lake and is used by the Ruskin Dam 5.6 km (3 mi) downstream at for power generation.[4]

See also

References

  1. ^ "Mission Historic & Heritage Sites". Hello BC. http://www.hellobc.com/en-CA/SightsActivitiesEvents/ArchitecturalStructuralExplorations/HistoricHeritageSites/Mission.htm. Retrieved 26 June 2011. 
  2. ^ a b Veltri, Christopher. "Stave Falls". Mission Museum. http://www.mission.museum.bc.ca/milestones-stave.html. Retrieved 25 June 2011. 
  3. ^ a b c d "Power House at Stave Falls". BC Hydro. http://www.bchydro.com/etc/medialib/internet/documents/community/pdf/power_house_at_stave_falls_teacher_s_guide.Par.0001.File.power_house_at_stave_falls_teacher_s_guide.pdf. Retrieved 25 June 2011. 
  4. ^ a b c "Ruskin SEIAM Appendices April 2011". BC Hydro. pp. 32–51. http://www.bchydro.com/etc/medialib/internet/documents/planning_regulatory/projects/ruskin/ruskin_seiam_appendices.Par.0001.File.Ruskin-SEIAM-Appendices-April-2011.pdf. Retrieved 25 June 2011.