Especially during the dry season năm 2009 - 2010 Red River water levels to record lows in the past 100 years, the water level in Hanoi to H = 1.36m at a time when the AI in North Delta in general and Hai Phong in particular . With the water level to go into the saltwater intrusion in the river, almost all of the sewer pump station and gravity lies along the banks of rivers, estuaries are not difficult to get water or get water, to produce great photos agriculture.
The study calculated results of Irrigation Science Institute of Vietnam, to the average dry season flow for years about 1,000 m3 / s in Hanoi, the ability to penetrate deeper into the salty river levels are high.
Table 1: Distance salinization on some rivers flow to the average dry season many 1000 m3 / s in Hanoi
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