Operational rules are key to accomplish a proper management of a Water Distribution Systems and transient flow events are also important to control because it can affect a system in a serious way. This paper proposes a methodology for obtaining the optimal valve closure curves in a real WDS in Bogotá, Colombia in an emergency scenario. The paper first presents an overview about the main theoretical principles regarding transient flow that includes the valve hydraulic and the closure modelling. An optimization model is proposed that includes decision variables, restrictions, objective functions and optimization algorithms is proposed to address the problem. Given the nature of the problem, two approaches were used for its solution: monobjective and multiobjective. The results obtained show that a multiobjective approach allows for the obtaining of more closure curves than the monobjective approach.