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An agro-economic approach to assess the water savings feasible in an irrigated perimeter of Reunion island

Fusillier J.L., Chopart J.L.. 2005. In : Matheron Gérard (ed.), Soulié Michel (ed.). Water resources and management. Montpellier : Agropolis, p. 32-33. (Les dossiers d'Agropolis International, 3).

Within a context of limited water resource, the irrigated perimeters of the leeward coast of the Réunion Island (Département français d'Outre-Mer, Indian Ocean) are today facing a growing competition with the urban users. The priority given to drinking water supply and the emergence of concerns for the protection of aquatic zones question the level of water pumping for agriculture and current irrigation practices. The "Gestion de l'eau (Water Management)" and "Systèmes canne à sucre (Sugar Cane Systems)" URs of the Grad associated with the "Irrigation" UR of the Cemagref are implementing an agronomic and economic integrated approach at the different scales of cultivated plots, of the farm, and of the irrigated perimeter as a whole, to deal with the issue of the achievable water savings. The irrigated perimeters studied are characterised by a wide diversity of production structures and pedo-climatic factors. The method used intends to take this diversity into account through a zoning of the physical environment and of the water needs for the crops, and through a typology of the farms. The analysis and the modelling of the behaviour of the irrigators tries to explain the excess water consumption with respect to the optimal needs and to report on the means necessary to achieve potential water savings. The approach combines a modelling of the irrigation control rules to assess the water demand at individual level and an economic modelling of the agricultural offer (and of the demand in derived water) at the scale of the irrigated perimeter. (Texte intégral)

Mots-clés : périmètre irrigué; ressource en eau; gestion des eaux; besoin en eau; modèle; modélisation; réunion; france

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