Considering various uncertainties and complexities emerging with floods, system analyses of flood diversion plans are considered to have positive effects. The recent trend of decreasing discharge under the same water level during flooding seasons implies potential increases of diversion frequency and overflow risk [24]. In flood management, many uncertain factors related to peak flow and frequency need to be considered, such as flood flows, allowable diversion levels, available capacities, and water-diversion policies. Moreover, the flood-diversion targets also comprise uncertainties that are associated with economic implications. Such complexities can become further compounded by interactions among multiple uncertain parameters, as well as their association with economic penalties if the promised targets are violated. Particularly, interval, stochastic and fuzzy uncertainties as well as their interactions that exist in many real-world problems have placed them beyond the conventional optimization methods. Therefore, it is desired that parameter uncertainties and pre-regulated polices be incorporated within the planning system so that a sound flood diversion plan can be obtained with minimized losses.