Under the joint action of climate–human activities the use of runoff data whose mathematical properties have changed has become the key to watershed management. To determine whether the data have been changed, the number and the location of changes, we proposed a change-point detection framework. The problem of determining the parameters of wavelet transform has been solved by comparing the accuracy of identifying change points. This study helps traditional models adapt to environmental changes.

The time-varying design flood is a dynamic design flood, which considers the shortage of water resources and followed the law of flood evolution in reservoir operation. Compared with the traditional design flood, time-varying design flood can make full use of the measured data, reflect the actual situation of the reservoir and so on. Using time-varying design flood to develop a reservoir operation plan not only ensures reservoir safety but also effectively improves water resource utilization.