Agriculture Reference
In-Depth Information
season and where irrigation needs are stochastic as irrigation is only a complement to
rain. Furthermore, these individual withdrawals that are made in rivers and aquifers,
imply often water conflicts between agriculture and environment during the summer
period, when river flows are low, or between agriculture and other uses such as drinking
water, when the aquifers are overexploited.
Table 1. Evolution of irrigated areas (ha) from 1970 to 2000
1970
1979
1988
2000
Irrigated area (ha)
538 537
800 533
1 146 988
1 575 625
Potential irrigated area (ha)
767 200
1 325 227
1 796 769
2 633 682
Source : Service Central des Études et Enquêtes Statistiques — recensement agricole, 1970, 1979, 1988, 2000.
Table 2. Access to water in France
Access to water resource
Irrigated acreage (ha)
Acreage (%)
Collective
371 137
23.6
Individual
887 912
56.4
Both collective and individual
316 577
20.0
Total
1 575 616
100.0
Source : Service Central des Études et Enquêtes Statistiques — recensement agricole, 2000.
In order to regulate individual access to water resources and taking into account the
difficulty of the enforcement of legal rules (Flory, 2003), the only economic instrument in
place is tax on water withdrawal by the basin agencies following the polluter-pays
principle. Charges are derived from the withdrawn water volume or lump sums on the
basis of the irrigated surface when no metering system has been yet installed. Through
these charges users internalise some of the negative impacts on environment and third
parties are provoked. But, the low level of these charges compared to the cost of water
(individual or collective) services, implies they don't have any incentive to save water
(Table 3).
Table 3. Water basin authorities: abstraction charges for irrigation
Minimum & maximum
taxes amount
(2003-2006, )
Water basin
authorities
Average tax
(2002,
Abstracted volume
(millions m3, 2002)
Adour Garonne
0.0047
0.0026 - 0.0057
758
Artois Picardie
0.0134
0.0120 - 0.0609
15
Loire Bretagne
0.0066
0.0044 - 0.0175
495
Rhin Meuse
0.0014
0.0013 - 0.0015
77
Rhone Méditerranée
0.0015
0 - 0.0027
1643
Seine Normandie
0.0171
0.0051 - 0.0192
95
Source : Agences de l'Eau.
As these individual water services are not, by definition, subject to any charge, except
the charges we see in Table 3, or in very specific conditions where water is withdrawn
from a re-supplied river, this paper addresses collective services for irrigation that are
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