In France, the drought system cuts across two different administrative structures: 

  • The water management structure, which follows the geographical limits of the watersheds, a homogeneous unit from the point of view of water,
  • The alert structure, which follows the administrative boundaries of the state organization: the Departments.

When a water shortage is felt in a watershed, each concerned Department issues a decree to restrict water uses. This decree is issued by the Prefecture, and sent to all the mayors concerned.

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Example of an overlap map between the Watershed and the Department

(source: http://www.eau-poitou-charentes.org

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