In the actual context, after the publication of Water Framework Directive, the River Basin Management Plans (RBMP) stands out as recent and innovator instrument in the water management. Of the competences to elaboration, accompaniment, approbation, execution and supervision of this management instrument, the intervention of various entities in the process is detached. The degree and the reach of intervention of each entity in this process it is clearly definite: The Institute of water supervises the execution and checks the fulfilment of deadlines of the elaboration and review by Administrations of Hydrographic Regions; the National Water Council and the Hydrographic Region Councils accompany and emit the respective opinions before approval. The River Basin Management Plans are planning instruments of water that, aiming the management, the protection and the environmental, social and economic valorisation of waters (in the watershed), understand and establish programs of measures of base and measures additional. The programs of measures are adapted the characteristics of the basin, the impact of human activity the status of surface water and groundwater and are justified by economic analysis of the uses of water and by cost-benefit analysis of conditionings and restrictions impose these utilizations. For the execution of the proposals actions in RBMPs is important develop methodologies that may accompany, monitor and assess the planned measures. This paper want exhibit an applied matrix for the river Ave, for contribute in the development of a model valid for others hydrographics regions of Portugal
