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天津市地处海河流域下游,自北向南有:蓟运、潮白、北运、永定、大清、子牙、南运七大水系。由于本流域夏秋雨集量中,上游支流繁多、源短流急,下游河道狭窄,行洪能力上大下小,加之河口淤塞,河道淤积,苇障增多,堤防下沉等因素影响,有些骨干河道行洪能力下降幅度较大。如遇较大洪水,不仅增加郊县洼淀分洪、滞洪的机遇,更重要的是将严重威胁市区和京山、津浦铁路的安全。
Tianjin is located in the lower reaches of the Haihe River Basin, from north to south are: Ji Yun, Chaobai, North Yun, Yongding, Daqing, Ziya, Nan Yun seven major river systems. Due to the large amount of upstream and downstream tributaries in the summer and autumn rains, short upstream and downstream shortfalls, low and high flood discharge capacity, combined with siltation of the river mouth, river siltation, increased reed barrier and embankment subsidence, some backbone Flood discharge capacity of the river has been greatly reduced. In case of larger floods, it will not only increase the opportunities of flood diversion and detention of floodplains in the suburbs, but more importantly, it will seriously threaten the safety of the urban area and Jingshan and Jinpu railway.