A hydroeconomic DSS tool able to solve both simulation and optimization problems. It requires as input the physical and economic components of the system. The simulation module allocates water resources following a given operating policy implemented through two techniques: priority-based allocation or fuzzy-rule-based-system allocation. The optimization module finds out optimal decisions to maximice the economic benefits during water shortage events. It implements both determinsitic and stochastic approaches, as well as groundwater and stream-aquifer interaction techniques