Sensor webs can be thought of as distributed network systems composed of hundreds of resource constrained nodes. Sensor webs are deployed in large scale geographic environments for in-situ sensing and data acquisition purposes. However, interpreting the collected data as well as managing the sensor web has historically been done manually. This task has grown difficult if not impossible due to the complex functionality of modern sensor webs. Current initiatives seek to automate the process of data interpretation and sensor web management. In this paper, we propose a multi-agent geosimulation approach for the management of sensor webs. Our approach is applied in the context of a water resource monitoring project. Current results show the adequacy of our approach to cop with the highly dynamic operating conditions of such an application domain and its inherent distribution of resources