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Sharing water at catchment level: the impact of context on cooperative game solutions

IWRA World Water Congress 2008 Montpellier France
5. Water Governance and Water Security
Author(s): Mathieu Désolé
Stefano Farolfi
Fioravante Patrone
Patrick Rio
Mabel Tidball
Sophie Thoyer

Cirad University of Genoa Inra-Lameta Supagro-Montpellier (Lameta)

Keyword(s): negotiation-support tool, water allocation, cooperative games, experimental economics, South-Africa
Article: Poster:

AbstractThirteen years after the beginning of the democratization process in South Africa, many radical socio-political and institutional transformations have taken place in the country. Unlike during the Apartheid era, natural resource management and governance, particularly in the water sector, is nowadays based on concepts and criteria such as decentralization, economic efficiency, environmental sustainability and social equity. These criteria, which represent the pillars of the South African National Water Act (NWA-1998), are universally recognized as the fundaments of sustainable development and are widely employed in the definition of the environmental policies of the industrialized countries. To accompany this socio- political revolution, a process of institutional building is taking place in the South African water sector. New organizations, namely the Catchment Management Agencies (CMAs) and the Water Users Associations (WUAs) in charge of local governance of water are being established in the country. These new organizations urgently need tools, methods, processes that can help them in their difficult task of implementing locally the NWA by promoting the participation of local stakeholders in the process of water management and allocation. In particular, there is a need to gain a better understanding of collective decision mechanisms. In the South African context, participatory approaches – involving local stakeholders, decision-makers and researchers- have been implemented to accompany the water allocation process at catchment scale : the Kat River catchment was used as a pilot study to develop a role-playing game (KatAware –based on multi-agent simulations) accompanying the negotiation between water users on the allocation rules of irrigation water. However, the lessons of this experience are not easily transferable to other sites or situations. The objectives of our work are therefore to assess the impact of the context on the outcome of a collective decision: by identifying the contextual elements influencing most on individual behaviour and on collective action, we could then build negotiation-support tools which are more easily transferable from one context to another. This paper presents the results of theis joint research program called SAFeWATER, undertaken the University of Pretoria , the Centre for Environmental Economics and Policy in Africa and two French research institutions, CIRAS and INRA. We conduct laboratory experiments to identify the way subjects play a cooperative game – sharing a common resource leading to higher joint revenue when all users agree than when users form partial coalitions or try to play single-handedly. The allocations obtained in the laboratory are compared to well-known cooperative game solutions such as the Shapely values or the nucleolus solutions. This allows us to build a reference game. The same experiments are then conducted with a protocol which is progressively enriched with contextual details: ie the resource is named, subjects are attributed roles, etc. and compared to the reference game results. A final phase consists in conducting the same experiments in the field with concerned subjects (farmers instead of students). Our results confirm previous field experiments that context matters. If time allows, test-bed experiments are then used to compare the acceptability of various policy instruments yielding the same allocation as the copperative solution foud in the previous experiments. This work should help to measure more precisely to what extent context changes behaviour and allocation solutions in cooperative game situations. It should then allow us to build accompanying models facilitating negotiations between water users at catchment levels, which can be adjusted to each catchment, therefore overcoming the disposable model issue.
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