Watersheds Delineation using ArcSWAT || ArcSWAT Tutorial || Video-1
The first step in the model setup involves a delineation of the basin and sub-basin boundaries. This is accomplished using the automatic watershed delineation tool of ArcSWAT 2012.10.2.16 employing a 90 m DEM. A projection has been used for the DEM and all other GIS layers. All the watershed delineation steps such as filling sink, defining flow direction and accumulation have been done automatically through the user interface. After watershed delineation, River basins have been divided into many sub-watersheds based on the threshold area.
To setup the hydro-logical model using SWAT, the first step would be to delineate the river basin. The “Automatic Watershed Delineation” tool of ArcSWAT was used for this purpose. The “Automatic Watershed Delineation” uses the DEM as well as the river network provided by the user to delineate the watersheds of the catchment. In case the presence of large reservoirs in the catchment, the user can also incorporate that though the “Automatic Watershed Delineation”.