Eastmain-1-A/Sarcelle/Ruper t Hydroelectric Development I N F O R M AT I O N B U L L E T I N NUMBER 1 JUNE 2010
Rupert River Ecological Instream Flow Regime
416 m3/s
Between Cold fall - End of October and Warm fall - Early November
45 days
267 m3/s 20 to 30 days
127 m3/s
2
3
1
Walleye
2
Longnose sucker
3
White sucker
4
Sturgeon
5
Lake whitefish
3 days
4
When Mesgouez Lake at 450 m3/s Not before early May
Winter
127 m3/s
Spring
3 days
1
9 d ays
5 days
127 m3/s
5
Early July
Summer
Early October
Fall
Spring spawning, egg incubation and emergence - mid-May to early-July Intensive feeding period early June to early Oct.
Fall spawning - early Oct. to early Nov. Egg incubation and emergence early Nov. to end of May Intensive feeding period - early June to early Oct.
Winter
To better reproduce the natural cycle of the river, the flow rates are controlled. Therefore, the spawning and hatching periods in spring and in fall are not disturbed. To protect the fish habitat and fishing downstream of the Rupert River’s dam, a spillway allows the instream flow rates to be modulated.
For a better understanding of how hydroelectricity affects the land.
Partial Diversion of the Rupert River To Robert-Bourassa, La Grande-2-A and La Grande-1 Generating Stations
Partial Diversion of the Rupert River The instream flow release structure at the Ruper t spillway will return 29% of the mean annual flow to the river. The ecological instream flow will be 45% at Nemiscau Lake and 48% at Waskaganish, thanks to inflows from the rivers and streams that empty into the Ruper t River downstream of the Ruper t dam.
La Sarcelle Generating Station (in construction)
Opinaca Reservoir
Lemare and Nemiscau Rivers
Eastmain-1 Generating Station
The Lemare and the Nemiscau rivers are flowing at one point into the Ruper t bays and all their mean annual flows are released back to these rivers downstream from diversion bays.
Eastmain-1-A Generating Station (in construction)
Eastmain 1 Reservoir
The spring and fall runoffs are also reproduced in the Lemare and the Nemiscau rivers using instream flow release structures.
100 % Mean annual flow Nemiscau River Rupert Tailbay 100 % Mean annual flow Lemare River
Nemaska Waskaganish Rupert Bay
Rupert River
Rupert River
Nemiscau Lake 48 % Mean annual flow
Old Nemaska
Tommy-Neeposh Transfert Tunnel
Nemiscau River
Lemare River
Rupert Forebay
29 % Mean annual flow
For more information : MARTIN DESGAGNÉ, Advisor - Native Affairs and Projets 1 800 903-9705, ext. 4951 This information bulletin is published by Hydro-Québec Direction régionale - La Grande Rivière
For a better understanding of how hydroelectricity affects the land.
Rupert River