Pourrait-on réallouer des redevances acceptables de pompage de l’eau souterraine de la Crau à l’association d’irrigants de la zone ?*

<italic>Many aquifers, such as the Crau one, located in South-East of France, are not only exploited in order to satisfy human needs but are also replenished thanks to some farmers who are irrigating their crops according to old practices. Because of the positive externality hence induced, groundwater management is much more complicated than as usual, when only the withdrawals have to be slowed down. It is why we are going to consider in a new way the role of a local agency which is going to be in charge of the aquifer management. We will show that she can always implement a global fiscal scheme both being able to slow down the aquifer overexploitation by different non-atomistic users and to induce its optimal replenishment thanks to a watering association activity.</italic>