The delta area accounts for approximately 85% of the city’s area, which spreads out in such communes as Vinh Bao, Tien Lang, An Lao, Kien Thuy, An Duong, and the South of Thuy Nguyen. The delta area stands between 0.7 metres-1.7 metres above the sea level (City of Hai Phong, 2015). The city is vulnerable to flooding on a periodic basis, and tsunamis at any time, as well as being threatened over the longer term by sea-level rise, localised flooding due to more intense rainstorms (precipitation) and ocean storm surges.