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FAQ/ When the river center line is set as the cell boundary, the inside of the river channel is flooded.

When = was used for wide rivers,[Connection of rivers and floodplain cells] the [Kawashin line as cell boundary] inundation depth was also displayed in the river channel.

To avoid this, I tried Method 1 or Method 2 below. Either way, the inside of the river channel was no longer flooded. Are there any problems with these methods?

Method 1: Set the cells in the river channel close to .

Method 2: Similarly, we set the cells in the river channel sea to as and the project properties [Exclude seas/rivers] = True as well .

response

Both Method 1 and Method 2 have problems.

  • Method 1: This setting ensures that the elevation next to the river channel is infinite and that water does not overflow from the river channel into the floodplain.
  • Method 2: This setting makes the ocean next to the river channel, and the overflowing water from the channel enters the sea and disappears.

Try the following:

  • [Connection of rivers and floodplain cells] = and set the [Kawashin line as cell boundary] elevation within the river range to the same value as the embankment inland, and manually delete the inundation depth of the river area when mapping.
  • [Connection of rivers and floodplain cells] = [Left and right coast lines into cells] and
Last update: 2023-03-20