how DEMs integrate with SWAT model sub-basins

 

Digital Elevation Model (DEM) is used to divide a watershed into multiple sub-basins in the SWAT (Soil and Water Assessment Tool) model. Each colored rectangle represents a sub-basin automatically delineated based on terrain and stream network derived from the DEM.

Here's how the integration works in SWAT:

• The DEM provides elevation values that define surface flow direction and accumulation.

• SWAT uses this to identify outlet points and delineate sub-basins based on topographic divides.

• Each sub-basin is further subdivided into Hydrologic Response Units (HRUs) using land use, soil, and slope data.

This process is covered step-by-step in the course: 👉 ArcSWAT Model with ArcGIS - Run for Any Study Area – GIS