Figure 1.1. Time Series of Intercepted Continental Runoff and Large Reservoir Storage, 1900-2000

"The series is taken from a subset of large reservoirs (>0.5 cubic kilometers storage each) totaling about 65% of the global total reservoir storage for which information was available that allowed the reservoir to be georeferenced to river networks and discharge. The years 1960-2000 have shown a rapid move toward flow stabilization, which has slowed recently in some parts of the world due to the growing social, economic, and environmental concerns surrounding large hydraulic engineering works."

Source & © Millennium Ecosystem Assessment
 Synthesis Report (2005),
Chapter 1, p.26
(Conditions and Trends Working Group Report, C7 Freshwater Ecosystems, Fig 7.8)