Efficient and equitable water, wastewater and stormwater management for the megacities is becoming an increasingly complex task. The special issue will focus on water management in its totality for megacities, including their technical, social, economic, legal, institutional and environmental dimensions through a series of specially invited case studies from different megacities of the world.

At present, around one out of two of the earth's 6.3 billion people live in urban areas. Each year, the world population grows by around 80 millions. Practically all of this growth is...