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１９９８年汛期，嫩江流域、松花江流域发生了超历史记录的特大洪水。文中在汇集大量勘测分析成果后， 经分析论证得出如下结论： １９９８ 年嫩江洪水的特征是： 从过程分布上看， 发生早， 结束晚， 持续时间长， 洪水次数多， 支流洪水多在干流遭遇； 从地域分布特点上看， 有上游型、下游型、全流域型洪水；从洪水来源角度看， 洪水主要来自于嫩江右岸支流。松花江干流洪水特征是： 洪水主要来自嫩江， 洪水过程平缓， 洪峰持续时间长。
During the flood season of 1998, there was an exceptionally large flood exceeding historical records in the Nenjiang River Basin and the Songhua River Basin. After a large amount of survey and analysis results are collected, the following conclusions are drawn from the analysis and argumentation: The characteristics of the Nenjiang flood in 1998 are as follows: early and late late, long duration, flood times, In terms of geographical distribution, there are upstream type, downstream type and whole basin type floods. From flood source perspective, the flood mainly comes from the right bank tributary of Nenjiang. Flood characteristics of the main stream of the Songhua River are as follows: The flood mainly comes from the Nenjiang River. The flood course is gentle and the flood peak lasts for a long time.