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Agriculture, water, and ecosystems: avoiding the costs of going too far

6

map 6.2

River channel fragmentation and flow regulation of global rivers

Unfragmented

Moderately fragmented

Highly fragmented

No data

Unassessed

Source: Revenga and others 2000.

  • gure 6.1

Development of water infrastructure and regulation of rivers resulted in the impoundment of large amounts of water

Intercepted continental runoff

Reservoir storage

Sum of discharge (cubic kilometers per year)

16,000

14,000

12,000

10,000

8,000

6,000

Sum of capacity (cubic kilometers)

5,000

4,000

3,000

2,000

4,000

1,000

2,000

0 1900

1920

1940

1960

1980

2000

0 1900

1920

1940

1960

1980

2000

Note: The time series data are taken from a subset of large reservoirs (0.5 cubic kilometers maximum storage each), geographically referenced to global river networks and discharge.

Source: Millennium Ecosystem Assessment.

237

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