The study analyzed how to use flood water more effectively by adjusting the flood control level at a reservoir. By studying the Yanghe Reservoir in Hebei Province, the researchers created a model to see how different flood control levels could impact water storage and release during floods. They also looked at factors like safe operation, downstream flood control, and ecological water use. The study found that adjusting the flood control level can lead to better use of flood water resources, with different optimal levels needed for various flood frequencies.