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为了保护位于郁江干流上的南宁市，正规划兴建百色水库防洪，为确定其防洪库容，需对郁江南宁洪水进行分析。由于郁江南宁洪水的地区组成复杂，有来自右江百色以上、百色到右江河口区间、左江流域、百色至南宁大区间及郁江南宁以上流域等地块，本文采用多种典型年法分析其洪水组成，并采用多种计算方法（洪量组成法、峰量兼控组成法、分时段同频率组成法、变时段同倍地组成法、变时空同倍比组成法），计算南宁洪水的地区组成，以确定百色水库的防洪库容和充分说明该水库对下游的防洪作用。
In order to protect the Nanning Municipality located in the mainstream of the Yujiang River, the Baise Reservoir flood control project is under planning. To determine its flood control capacity, an analysis of the Nanning flood in the Yujiang River is needed. Due to the complexity of the Yu-Nanning flood, there are many plots from the Baise over the Right River, the Baise to the Youjiang estuary, the Zuojiang River Valley, the Baise-Nanning Great Basin, and the Yu-Nan Nanning basin. Based on various typical years, Floods, and the use of a variety of calculation methods (flood volume composition method, the peak amount and control composition method, the same time frequency composition method, the same time varying composition of the same time, variable time and space same composition ratio method), Nanning flood area To determine the flood control capacity of Baise Reservoir and fully explain the flood control effect of the reservoir to the downstream.