Seven Mile Dam
| Seven Mile Dam | |||||||||
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| Coordinates | 49 ° 1 '49 " N , 117 ° 30' 12" W | ||||||||
| Data on the structure | |||||||||
| Lock type: | Gravity dam | ||||||||
| Construction time: | 1975-1979 | ||||||||
| Height of the barrier structure : | 80 m | ||||||||
| Height of the structure crown: | 530 m | ||||||||
| Crown length: | 347 m | ||||||||
| Power plant output: | 848 MW | ||||||||
| Operator: | BC Hydro | ||||||||
| Data on the reservoir | |||||||||
| Altitude (at congestion destination ) | 527.3 m | ||||||||
| Water surface | 4.2 km² | ||||||||
| Reservoir length | 15.5 km | ||||||||
| Reservoir width | 400 m | ||||||||
| Catchment area | 66 680 km² | ||||||||
| Design flood : | 13 290 m³ / s | ||||||||
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The Seven Mile Dam (English for "seven-mile dam") is a dam on the Pend Oreille River in the southeast of the Canadian province of British Columbia .
dam
The Seven Mile Dam is located 15 km southeast of the City Trail , 10 km above the confluence of the Pend Oreille River and the Columbia River . The built 1975-1979 Dam is a 80 m high gravity dam of concrete . The crown length is 347 m. It is divided into a 107 m long northern dam section, the 102 m long power station building, a 98 m long flood relief consisting of five segments and a 40 m long southern dam section. The flood relief is designed for 13,290 m³ / s.
Reservoir
The 420 ha large and 15.5 km long reservoir extends upstream to 1.5 km beyond the US border. It was dammed for the first time in November 1979, then at a height of 522.7 m . In 1988 the congestion target was increased to the current value of 527.3 m . The Salmo River flows into the reservoir 8 km above the dam. 15.5 km upstream is the Boundary Dam and 9 km downstream is the Waneta Dam . The catchment area covers approximately 66,680 km². The mean discharge of the Pend Oreille River at the Seven Mile Dam is 763 m³ / s.
power plant
The power plant operated by BC Hydro has four units with a total installed capacity of 848 MW. Between 1979 and 1981 three units with outputs of 214 MW, 214 MW and 200 MW were put into operation. The fourth unit with 220 MW went into operation in 2003. The expansion water volume is 1472 m³ / s. The fall height is 61 m. The expected annual energy production is 3200 GWh.
Flow regulation
The inflow into the reservoir is mainly determined by the 10 upstream hydropower plants. During the spring snowmelt between mid-May and mid-June, the highest inflows of the year occur. The power plant is operated as a run-of-river power plant. The daily water level fluctuations in the reservoir are limited in winter to avoid bank erosion. They are also limited in summer, as there are many people looking for relaxation at the lake during this time. During the spawning season of the white sturgeon from June to August, the runoff into the downstream river is reduced.
Web links
- Seven Mile Dam at www.virtualmuseum.ca
Individual evidence
- ↑ a b c Pend D'Oreille Recreation Area . BC Hydro. Accessed March 31, 2018.
- ↑ a b c Seven Mile Dam: Dam Stability Improvements (PDF, 149 KB) www.contechsystems.com. Spring 2004. Accessed April 1, 2018.
- ↑ a b Dam Safety Quarterly Report (PDF, 593 KB) BC Hydro - Power smart. June 30, 2016. Retrieved April 1, 2018.
- ↑ a b c d e f g h Seven Mile Project Water Use Plan (PDF,) BC hydro. December 8, 2006. Accessed April 1, 2018.
- ↑ a b c d Seven Mile Project Water Use Plan (PDF, 178 KB) BC hydro. March 2007. Accessed April 1, 2018.
