Important reminder: In the event of a flood, contact your municipality. They will advise the Ministère de la Sécurité publique du Québec, which coordinates all flood-related operations.
Questions on how Hydro‑Québec facilities are managed? Contact us at RAMAT-NdQ@hydro.qc.ca.
Do all the dams located between Dozois reservoir and the Première-Chute generating station belong to Hydro‑Québec?
No. Hydro‑Québec is not the only operator of facilities in the upper Outaouais watershed. The river’s water levels and flows are managed collaboratively by the ORRPB member agencies: the Ministère de l’Environnement et de la Lutte contre les changements climatiques du Québec, the Ministry of Natural Resources and Forestry of Ontario, Environment and Climate Change Canada, Public Services and Procurement Canada, the Canadian Coast Guard, Ontario Power Generation and Hydro‑Québec.
What is Hydro‑Québec’s role during flood season in the Beauchastel, Montbeillard, Bruyère, Kinojévis and Baie Caron area?
Since Hydro‑Québec has no dams or generating stations on the Kinojevis, it cannot retain the river’s water or regulate its flow. Therefore, the company does not play any role in this area during flood season.
Is the level of Lac Beauchastel affected by Hydro‑Québec’s operations at the Rapide-2 generating station on the Outaouais?
No. Lac Beauchastel is located 44 km from the mouth of the Outaouais, much farther downstream than Rapide-2 generating station. The rise in water levels at Lac Beauchastel is due to the narrowness of the Kinojévis over a 26-km stretch and the presence of the Gendron rapids, which hinder the flow of floodwaters into the Outaouais.
What is the role of the Rapide-7, Rapide-2, Rapides-des-Quinze, Rapides-des-Îles and Première-Chute generating stations during flood periods in the Témiscamingue region?
On the upper Outaouais, the only generating station with a reservoir is Rapide-7 generating station, and its reservoir is small. During flood periods, the maximum capacity of this reservoir is quickly reached. All the other generating stations are run-of -river, meaning that they do not have a reservoir. Therefore, they cannot hold back water during flood periods, the way reservoir generating stations do.
Does Hydro‑Québec retain water in the Témiscamingue region to limit the impact of the flood further south?
Hydro‑Québec retains water in the northern part of the watershed from mid-March to mid-May, mainly in Dozois reservoir. This reservoir is large enough that it can keep its discharge structure closed for several weeks. Decelles reservoir, despite being the second largest Hydro‑Québec reservoir in the region, is much smaller; it reduces spring flood inflows only slightly and for a limited time. The partners of the Ottawa River Regulation Planning Board (ORRPB), including the Ministère de l’Environnement et de la Lutte contre les changements climatiques du Québec at Lac des Quinze and Public Services and Procurement Canada at Lac Témiscamingue also play an important role in reducing flood flows through the management of their reservoirs.
How are citizens informed about the water levels on the Rivière des Outaouais due to spring thaw?
The Sécurité civile and municipalities are responsible for informing citizens and managing emergency response operations, including in the event of a flood risk. In collaboration with the ORRPB, Hydro‑Québec informs the Sécurité civile and municipalities of the water level variations in the Outaouais during flood periods.