@article{fdi:010063697, title = {{C}ritical multi-level governance issues of integrated modelling : an example of low-water management in the {A}dour-{G}aronne basin ({F}rance)}, author = {{M}azzega, {P}ierre and {T}herond, {O}. and {D}ebril, {T}. and {M}arch, {H}. and {S}ibertin-{B}lanc, {C}. and {L}ardy, {R}. and {S}ant'ana, {D}.}, editor = {}, language = {{ENG}}, abstract = {{T}his paper presents the experience gained related to the development of an integrated simulation model of water policy. {W}ithin this context, we analyze particular difficulties raised by the inclusion of multilevel governance that assigns the responsibility of individual or collective decision-making to a variety of actors, regarding measures of which the implementation has significant effects toward the sustainability of socio-hydrosystems. {M}ulti-level governance procedures are compared with the potential of model-based impact assessment. {O}ur discussion is illustrated on the basis of the exploitation of the multi-agent platform {MAELIA} dedicated to the simulation of social, economic and environmental impacts of low-water management in a context of climate and regulatory changes. {W}e focus on three major decisionmaking processes occurring in the {A}dour-{G}aronne basin, {F}rance: (i) the participatory development of the {M}aster {S}cheme for {W}ater {P}lanning and {M}anagement ({SDAGE}) under the auspices of the {W}ater {A}gency; (ii) the publication of water use restrictions in situations of water scarcity; and (iii) the determination of the abstraction volumes for irrigation and their allocation. {T}he {MAELIA} platform explicitly takes into account the mode of decision-making when it is framed by a procedure set beforehand, focusing on the actors' participation and on the nature and parameters of the measures to be implemented. {I}t is observed that in some water organizations decision-making follows patterns that can be represented as rule-based actions triggered by thresholds of resource states. {W}hen decisions are resulting from individual choice, endowing virtual agents with bounded rationality allows us to reproduce (in silico) their behavior and decisions in a reliable way. {H}owever, the negotiation processes taking place during the period of time simulated by the models in arenas of collective choices are not all reproducible. {O}utcomes of some collective decisions are very little or not at all predictable. {T}he development and simulation of a priori policy scenarios capturing the most plausible or interesting outcomes of such collective decisions on measures for low-water management allows these difficulties to be overcome. {T}he building of these kind of scenarios requires close collaboration between researchers and stakeholders involved in arenas of collective choice, and implies the integration of the production of model and the analysis of scenarios as one component of the polycentric political process of water management.}, keywords = {{M}ulti-level governance ; {I}ntegrated modelling ; {C}ollective choice arena ; {D}ecision-making ; {S}cenario ; {L}ow-water management ; {FRANCE}}, booktitle = {}, journal = {{J}ournal of {H}ydrology}, volume = {519}, numero = {{SI}}, pages = {2515--2526}, ISSN = {0022-1694}, year = {2014}, DOI = {10.1016/j.jhydrol.2014.09.043}, URL = {https://www.documentation.ird.fr/hor/fdi:010063697}, }