The SIMRISK module was designed for its use in river basin management in the medium-term to evaluate the management risks. It runs a simulation of the management of the system for an initial condition of levels in reservoirs and aquifers, and uses as data multiple future hydrological inflows scenarios of one or more years. Probability calculations are done for each month of the simulated period from the results of all the scenarios. These can be used as probable estimation of the final situation of the system at the end of the present campaign, or after two or more hydrological years. This module was designed to be used in models calibrated with SIMGES, so each simulation is made in the same way than in SIMGES. Data edition is made from the same interface than SIMGES.