In 2015, during COP21, ARCEAU-IdF co-organized in partnership with UNESCO’s International Hydrological Program and SIAAP an international conference on Water, Megacities and Global Change. The conference gathered almost 400 participants from all over the world with various profiles: scientists, operators, elected officials and civil society.

Main issues

  • State-of-art on water governance in megacities
  • Highlight on innovative solutions in the water field
  • Development of an international network of megacities


  • 56 scientific and technical communications
  • 3 round tables on water governance and adaptation to climate change
  • 1 declaration presented at COP21 on Water Megacities and Climate Change