Rupert River Ecological Instream Flow Regime

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Rupert River Ecological Instream Flow Regime

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

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