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A flood is an overflow of water that submerges land which is usually dry. Within GIS we often want to model a flood with terrain models.

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Showing overland flow route on DEM in QGIS?

It is called Lake Flood. I recommend SAGA GUI, but if it has to be done in QGIS, you can find it in the Processing Toolbox | SAGA | Terrain Analysis - Hydrology | Lake flood. … (3) Lake Flood Select Lake Flood tool. 2. Set Grid system, and 3. Select your DEM and Seeds raster (the one you have just created). 4. …
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