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The complexity of environmental dynamics makes more and more difficult the decision-making process. Therefore, the environmental managers, in particular in water management, rely on Environmental Decision Support Systems (EDSS) to help them. This paper defines the major generic functionalities of EDSS and the specific functionalities for an EDSS dedicated to the hydraulic management of the Camargue ecosystem. For this specific EDSS, a software architecture performing these functionalities is also proposed. Composed of functional modules and of an integration infrastructure inspired by HLA (High Level Architecture), this architecture would be reusable for development of other specific EDSS.