Flooding Analysis

Flooding analysis is a common hydrological GIS application used to simulate and predict areas that may be affected by flooding events.

Click on Terrain > Flooding Analysis.

Input DEM File: Input DEM file. For generation methods, refer to DEM Generation.
Regions of Interest: Input vector file, can be empty. If an area of interest file is provided, the analysis will be confined to that area.
Building File: Input vector file containing extracted building data, can be empty. If provided, the analysis will include the impact on buildings.
Minimum Slope: Used for the depression filling process in DEM data.
Accumulation Method: Used for flow accumulation, currently supports D8, D-Infinity, and MFD methods.
Flow Threshold: Used for river network extraction. Only areas with values above this threshold will form rivers.
Water Level Height: Specify the current water level. After extracting the river network and delineating watersheds, areas with raster values lower than the water level within each watershed will be considered flooded.
Amount of Precipitation: Specify the precipitation amount in millimeters (mm). The precipitation will affect the water level in each watershed, ultimately influencing the flooded areas.
Output Path: The algorithm will output the flooding analysis results and related reports.

Flood Analysis