IPCC Fourth Assessment Report: Climate Change 2007
Climate Change 2007: Working Group II: Impacts, Adaptation and Vulnerability
Figure 11.3

Figure 11.3. Annual inflow to Perth Water Supply System from 1911 to 2005. Horizontal lines show averages.

Source: www.watercorporation.com.au/D/dams_streamflow.cfm. Courtesy of the Water Corporation of Western Australia.