After the '' ' historical floods ' '' in early November 2008 , people in Hanoi have , since then , seen Tô Lịch river 's water " clean " as it was in previous years . Before said floods , Tô Lịch river was diluted down the mud and waste by rainwater , rising yards , rolling flow and fishes . That flood had the Tô Lịch river 's water cleaned within a few weeks
historical floods
2008 Vietnam floods
Tô Lịch River