Résumé
This report contains the executive summaries of the diagnosis (part 1), the stakeholders points on the views and the perspectives (part 2) of the State concessions of the Neste system. This audit was commissioned from Irstea by the Ministry of Agriculture, with a view to their transfer to the Occitania and New Aquitaine Regions. It is completed by a Strengths-Weaknesses-Opportunities Analysis (SWOT) of the management of this complex hydraulic system. The main challenge for the sustainability of this system is to reform its economic model. This must include a thorough review of the pricing system for the uses of the water (agriculture, raw water for drinking water and industry) which contribute to the system's operating and maintenance revenue. It should also include a clearer remuneration of non-drawing uses, and in particular the supply for the salubrity at the head of the rivers or to the minimum flow requirement.