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Master Thesis

Impact sur les débits réservés de la loi sur l'eau les milieux aquatiques. Mise en conformité des aménagements hydroélectriques de l'Unité de Production Sud

Abstract : Hydroelectric exploitation requires the diversion of natural water streams from their original course. After being removed from watercourses by water intake stations, they are transported through tunnels and penstocks towards the power plants. Once used, the flow returns the river bed going through the plant tailrace. Each water intake thus creates a short-circuited watercourse section in which the lack of water can endanger the survival of species. Restricted flows, legally established in 1919, aim at protecting aquatic environments: they are defined as the minimum flows delivered by water intakes in the natural water bed. The water and aquatic environments law of 2006 impose, with a deadline set on January 1st 2014, a restricted flow increase up to one tenth or one twentieth of watercourses mean flows depending on cases. The “Restricted Flows 2014” national project aims at ensuring the compliance of all EDF installations throughout the French territory. It sets up an allocation of tasks by distinguishing on technical standards between compliance works that require important changes and interventions that only account for simple changes. Former interventions are placed under the Center of Hydraulic Engineering (CIH) responsibility. Latter works are to be realized by each one of the five Production Unities that daily supervise on a given area (East, Southwest, the Mediterranean area...) power plants exploitation. In this context, the present report outlines the approach adopted within the Southwest Unity of Production in order to address the necessity of a restricted flow increase. With the intention of gaining a thorough knowledge of all installations, the study starts with a fieldwork stage. This contact with the field allows a better comprehension of each site and gives an opportunity to gather all technical data needed for the sizing study. It also enables an important dialogue with the operator, the only person to be daily in close contact with the water intake. The sizing study then provides as precisely as possible the typology of changes to be executed on the restitution device. These specifications can also include adjustments to be made on potential control or supervision devices that might be needed. In hopes of a national standardization, the framework of a standard dossier, containing both a description of the existing device and a definition of the adjustments to be made, was composed at the Southwest Unity of Production. It is the study mounting and the work to be delivered for each water intake. Its use has been widened to most of the Division of Hydraulic Production and Engineering (DPIH) entities. By these modalities, more than 80 % of water intakes visits have been made during the training period, along with more than 50 % of the sizing studies scheduled for 2010.
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Master Thesis
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Submitted on : Wednesday, September 15, 2010 - 3:53:48 PM
Last modification on : Friday, October 23, 2020 - 4:33:42 PM
Long-term archiving on: : Friday, December 2, 2016 - 1:16:32 AM


  • HAL Id : dumas-00517809, version 1



Camille Alava. Impact sur les débits réservés de la loi sur l'eau les milieux aquatiques. Mise en conformité des aménagements hydroélectriques de l'Unité de Production Sud. Energie électrique. 2009. ⟨dumas-00517809⟩



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