Managing the competing water demands from off-stream and in-stream users - a conceptual framework

Mullick Reaz Akter, Babel Mukand Singh, Perret Sylvain. 2009. Managing the competing water demands from off-stream and in-stream users - a conceptual framework. In : Improving integrated surface and groundwater resources management in a vulnerable and changing world : Proceedings of Symposium JS.3 at the Joint Convention of the International Association of Hydrological Sciences (IAHS) and the International Association. Blöschl Günter (ed.), Van De Giesen Nick (ed.), Muralidharan D. (ed.), Ren Liliang (ed.), Seyler Frédérique (ed.), Sharma Uttam (ed.), Vrba Jaroslav (ed.). IAHS, IAH. Wallingford : IAHS, 327-333. (IAHS Publication, 330) ISBN 978-1-907161-01-8 IAHS/IAH Symposium JS.3, Hyderabad, Inde, 6 Septembre 2009/12 Septembre 2009.

Résumé : Satisfying the demands of freshwater for growing population, industrialization and urbanization appears to be an enormous challenge to continuing to run the economic wheel without undermining the ecosystem needs. Environmental water allocation is widely acknowledged; however, it is implemented in few countries mainly in developed regions, even though dependency on flow is more pronounced in developing countries. Environmental water requirements are often ignored in traditional water allocation decision-making in these countries. Available environmental flow assessment methodologies focus more on conservation and restoration of the aquatic ecosystems, rather than taking the economic value of water into consideration. However, it is observed that economic aspects play a critical role in the implementation of environmental flow. A conceptual model for water allocation based on marginal benefits from sectoral water-use is proposed in this study to ensure environmental water allocation. An economic-hydrological model is conceptualized in which the economic return from all water uses is to be correlated with river discharge. The derived marginal benefit functions are targeted for both off-stream and direct in-stream uses through analysis of the economic return from off-stream extractions and the variation of in-stream use benefit in terms of flow level fluctuation. Two marginal benefit functions are proposed for the optimization analysis by maximizing consumer surplus and minimizing demand deficit. Such analyses will explore the extent of trade-offs associated with establishing environmental water allocation and subsequently will help in achieving environmental and economic sustainability by having equity between all users.

Classification Agris : P10 - Ressources en eau et leur gestion
P01 - Conservation de la nature et ressources foncières

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations

• Mullick Reaz Akter, AIT (THA)
• Babel Mukand Singh, AIT (THA)
• Perret Sylvain, CIRAD-ES-UMR G-EAU (THA) ORCID: 0000-0002-8411-3656

Source : Cirad - Agritrop (https://agritrop.cirad.fr/554332/)

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