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| Titel |
Groundwater use for irrigation – a global inventory |
| VerfasserIn |
S. Siebert, J. Burke, J. M. Faures, K. Frenken, J. Hoogeveen, P. Döll, F. T. Portmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 14, no. 10 ; Nr. 14, no. 10 (2010-10-12), S.1863-1880 |
| Datensatznummer |
250012440
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| Publikation (Nr.) |
 copernicus.org/hess-14-1863-2010.pdf |
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| Zusammenfassung |
| Irrigation is the most important water use sector accounting for about
70% of the global freshwater withdrawals and 90% of consumptive water
uses. While the extent of irrigation and related water uses are reported in
statistical databases or estimated by model simulations, information on the
source of irrigation water is scarce and very scattered. Here we present a
new global inventory on the extent of areas irrigated with groundwater,
surface water or non-conventional sources, and we determine the related
consumptive water uses. The inventory provides data for 15 038 national and
sub-national administrative units. Irrigated area was provided by
census-based statistics from international and national organizations. A
global model was then applied to simulate consumptive water uses for
irrigation by water source. Globally, area equipped for irrigation is
currently about 301 million ha of which 38% are equipped for irrigation
with groundwater. Total consumptive groundwater use for irrigation is
estimated as 545 km3 yr−1, or 43% of the total consumptive
irrigation water use of 1277 km3 yr−1. The countries with the
largest extent of areas equipped for irrigation with groundwater, in
absolute terms, are India (39 million ha), China (19 million ha) and the
USA (17 million ha). Groundwater use in irrigation is
increasing both in absolute terms and in percentage of total irrigation,
leading in places to concentrations of users exploiting groundwater storage
at rates above groundwater recharge. Despite the uncertainties associated
with statistical data available to track patterns and growth of groundwater
use for irrigation, the inventory presented here is a major step towards a
more informed assessment of agricultural water use and its consequences for
the global water cycle. |
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