Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 11 2 2007 10.5194/hess-11-711-2007 http://www.hydrol-earth-syst-sci.net/11/711/2007/ http://www.hydrol-earth-syst-sci.net/11/711/2007/hess-11-711-2007.html http://www.hydrol-earth-syst-sci.net/11/711/2007/hess-11-711-2007.pdf 711 720 2007-01-17 Modeling and analysis of collective management of water resources A. Tilmant a.tilmant@unesco-ihe.org P. van der Zaag P. Fortemps UNESCO-IHE, Department of Management and Institution, Delft, The Netherlands Water Resources Section, Delft University of Technology, Delft, The Netherlands Faculté Polytechnique de Mons, Department of Applied Mathematics and Operational Research, Mons, Belgium Integrated Water Resources Management (IWRM) recommends, among other things, that the management of water resources systems be carried out at the lowest appropriate level in order to increase the transparency, acceptability and efficiency of the decision-making process. Empowering water users and stakeholders transforms the decision-making process by enlarging the number of point of views that must be considered as well as the set of rules through which decisions are taken. This paper investigates the impact of different group decision-making approaches on the operating policies of a water resource. To achieve this, the water resource allocation problem is formulated as an optimization problem which seeks to maximize the aggregated satisfaction of various water users corresponding to different approaches to collective choice, namely the utilitarian and the egalitarian ones. The optimal operating policies are then used in simulation and compared. The concepts are illustrated with a multipurpose reservoir in Chile. The analysis of simulation results reveals that if this reservoir were to be managed by its water users, both approaches to collective choice would yield significantly different operating policies. 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