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Master Thesis

Mise en place d'un Organisme unique de gestion collective (OUGC) sur le bassin versant du Gapeau (département du Var)

Abstract : In order to manage the global water supply - abundant but unevenly distributed and challenged by climate change - France has for the past fifteen years undertaken a quantitative water management reform. This is achieved by the LEMA 2006 law, which determines the withdrawable volumes and the implementation of a collective water management system, irrigated through the intermediary of Unique Collective Management Organizations(OUGC). Indeed, as a major global water consumer, the agricultural sector face strong societal and environmental pressures. The agricultural bodies must adapt and implement new water saving solutions when they do not necessarily have the technical or financial abilities to do so. The OUGCs take these constraints into account and suggest to save water not at withdrawals but by working on the practices and needs, and by reasoning at the watershed level. The objective being to optimise consumption by implementing a distribution plan with a predefined global water volume reserved foragriculture. As a direct player in contact with the rural sector, the Var Chamber of Agriculture has taken the role of a OUGC and will manage withdrawals made from surface water bodies and from the alluvial aquifer of the Gapeau basin. This territory, classified as Water Distribution Zone (ZRE) suffers from regular quantitative deficits, especially during drought flow. The Gapeau valley is characterized by its fertility but also by its exposure to other anthropogenic pressures (demographic growth, urbanization, tourism, industries, etc.) which create an imbalances between the needs of users, those of the environment and the water resources available. Let us understand the interests and the steps in setting up an OUGC: The political, regulatory, territorial and environmental context of the study area makes it possible to assess the progress of the implemented measures to achieve the objective, being a "good quantitative level of water bodies”. A significant delay in terms of regulatory compliance and knowledge withdrawals has been identified, thus slowing the implementation of coherent and sustainable management of the resource. Requiring a strong involvement on the part of the collectors, the OUGC is a good way to improve knowledge about the samples taken on the territory it covers. The launching phase consisted in communicating the approach to agricultural samplers in Gapeau. Two distinct approaches were used in order to reach the targeted public, since the territory has the particularity of being exposed to two categories of withdrawals. "Individual withdrawals", carried out directly in rivers or in aquifers, in particular via boreholes or pumping and "collective withdrawals" carried out via gravity irrigation canals typical of Mediterranean regions. During the first semester, the conduct of a census survey and hotlines for individuals, as well as the organization of information and consultation workshops for groups, were therefore associated with regular consultation of technical partners and the financial resources of the project. From the result analysis, it appears that the samplers have a good understanding of the environmental and societal issues justifying such an approach. The interest in these channels were greatly emphasised by giving them the possibility in federating to better control their consumption and remed the management problems they currently face. However, the regulatory deadlines, the mistrust of some samplers and the non-exhaustive nature of the results after several months of work prove that such a tool requires several years of implementation before being operational. During this time, awareness-raising, consultation and support for agricultural samplers, both in bringing them into compliance and in improving their practices, will be essential conditions for the success of the project.
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Submitted on : Monday, March 15, 2021 - 3:12:34 PM
Last modification on : Saturday, July 31, 2021 - 3:52:56 AM


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  • HAL Id : dumas-03032968, version 1


Juliette Guichard. Mise en place d'un Organisme unique de gestion collective (OUGC) sur le bassin versant du Gapeau (département du Var). Agronomie. 2020. ⟨dumas-03032968⟩



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