Flooding: the average water level of the flood season months on most rivers are rising gradually from May to early August XI then IX is tapered to the end, XII. The largest floods on the perfume River in 1999 lasted from 1-6/XI, with the largest flood water level in Kim Long is 5.81 m; On the Han River in Danang flood usually in late may X with frequency appear on 80%, however the biggest 2009 floods occurred on October 29 IX above measured at the largest Camellia is 2.66 m (elevation Insular system map)
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