Flood passage refers to the function channel of diverting flood in the 喛 flushing area on both sides of the river, or the low areas such as lakes set up in a certain part of the river. There are some areas of diverting large water flow on both sides of big rivers. In normal times, attention should be paid to the maintenance of these channels so that they will not be blocked and can play a role in diverting flood when a big flood occurs.
During major floods, part of the flood is discharged by the channel, and the other part is discharged by the flood zone on both sides of the channel. The area between the dikes or banks on both sides of the river to vent the flood, and some rivers have large flood areas on both sides of the channel.
The flood channel refers to the channel of flood discharge, and the river is the channel of flood discharge.