These regulations are the legislative base for an efficient water resource management. The specific measures can be
selected for each(sub)catchment taking under consideration management options evaluated through computer
simulations which will provide a quantitative evaluation of their effectiveness in reducing environmental
concentrations and risks in large-scale catchments for specific EPs. This will require(1)selection of a subset of
measures according to the interest of simulations in comparison to existing knowledge;(2)translate the selected
measures into modeling scenarios for the tools(3)run the models,analyse the results and estimate the uncertainties;
(4) comparatively assess the management measures for risk reduction.Furthermore,cost-benefit analysis should be
carried out to analyse the economic feasibility of the selected measures.