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Chapitre 3. Le bassin versant, Unité de gestion des eaux idéale pour l’Afrique subsaharienne ?

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  • Luc Descroix

    (IRD - Institut de Recherche pour le Développement, LTHE - Laboratoire d'étude des transferts en hydrologie et environnement - OSUG - Observatoire des Sciences de l'Univers de Grenoble - UJF - Université Joseph Fourier - Grenoble 1 - Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology - INSU - CNRS - Institut national des sciences de l'Univers - IRSTEA - Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture - USMB [Université de Savoie] [Université de Chambéry] - Université Savoie Mont Blanc - CNRS - Centre National de la Recherche Scientifique - IRD - Institut de Recherche pour le Développement - INSU - CNRS - Institut national des sciences de l'Univers - INPG - Institut National Polytechnique de Grenoble - CNRS - Centre National de la Recherche Scientifique)

Abstract

Une des idées maîtresses du paradigme de la gestion intégrée des ressources en eau (GIRE), que l'on retrouve dans le premier principe de Dublin, concerne la supériorité et la nécessité du choix du bassin versant en tant qu'échelle opératoire. A priori, d'un point de vue hydrologique, la question de savoir si le bassin versant est l'unité intangible en matière de gestion de l'eau n'est ni plus ni moins pertinente en Afrique subsaharienne qu'ailleurs. Ce qui est admis, c'est que tout ce qui affecte le sol ou la cou-verture végétale d'un bassin est susceptible d'affecter en retour (à plus ou moins court terme) la ressource en eau, que ce soit en termes de quantité (prélèvements non restitués), de régime (prélèvements restitués avec délais, stockage interannuel ou intersaisonnier) ou de qualité (prélèvements avec

Suggested Citation

  • Luc Descroix, 2012. "Chapitre 3. Le bassin versant, Unité de gestion des eaux idéale pour l’Afrique subsaharienne ?," Post-Print ird-02157726, HAL.
    • Handle: RePEc:hal:journl:ird-02157726
    Note: View the original document on HAL open archive server: https://ird.hal.science/ird-02157726
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