AMBIO

, Volume 40, Issue 5, pp 437–446

Global Urban Growth and the Geography of Water Availability, Quality, and Delivery

Authors

    • Worldwide OfficeThe Nature Conservancy
  • Ian Douglas
    • School of Environment and DevelopmentUniversity of Manchester
  • Carmen Revenga
    • Worldwide OfficeThe Nature Conservancy
  • Rebecca Hale
    • School of Life SciencesArizona State University
  • Nancy Grimm
    • Faculty of Ecology, Evolution, & Environmental ScienceArizona State University
  • Jenny Grönwall
    • 110 Marlyn Lodge
  • Balazs Fekete
    • CUNY Research FoundationThe City College of New York
Report

DOI: 10.1007/s13280-011-0152-6

Cite this article as:
McDonald, R.I., Douglas, I., Revenga, C. et al. AMBIO (2011) 40: 437. doi:10.1007/s13280-011-0152-6

Abstract

Globally, urban growth will add 1.5 billion people to cities by 2030, making the difficult task of urban water provisions even more challenging. In this article, we develop a conceptual framework of urban water provision as composed of three axes: water availability, water quality, and water delivery. For each axis, we calculate quantitative proxy measures for all cities with more than 50,000 residents, and then briefly discuss the strategies cities are using in response if they are deficient on one of the axes. We show that 523 million people are in cities where water availability may be an issue, 890 million people are in cities where water quality may be an issue, and 1.3 billion people are in cities where water delivery may be an issue. Tapping into groundwater is a widespread response, regardless of the management challenge, with many cities unsustainably using this resource. The strategies used by cities deficient on the water delivery axis are different than for cities deficient on the water quantity or water quality axis, as lack of financial resources pushes cities toward a different and potentially less effective set of strategies.

Keywords

Aridity indexGlobal Rural/Urban Mapping ProjectGross-domestic productHydrosheds

Copyright information

© Royal Swedish Academy of Sciences 2011