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ArcSWAT extension of ArcGIS creates an ArcMap project file that contains .. In this tutorial we will concentrate on preparing the rest of the input data for. I wish to apply the SWAT tool in modeling the streamflow of a particular river basin, . watch the tutorial series of ArcSWAT here we made step by step setup of. Hello Friends, After long work on SWAT I have made SWAT tutorial, This covering data preparation to final simulation Step by step guide. This is covering how to.

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Before proceeding, you have a number of options: This function plays an important role in determining the detail of the stream network and the size and number of subbasins created.

Choose Load from disk and select the DEM grid located in your disk and click add. The suggested area given in this window is the average are that could be used. In this step the users will select one or more outlet locations to define the boundary of the main watershed. It also assigns the necessary subbasin identification. Open the Reach or Watershed attribute tables to view the calculated characteristics.

After setting the threshold value of subbasin, then the user can delineate the stream network and outlets through clicking the button. For simulation, a watershed is subdivided into a number of homogenous subbasins hydrologic response units or HRUs having unique soil, slope and land use properties.


These maps are not required but might speed the processing time arcsat the GIS operations. The DEM properties should correctly define the grid size and units.

Stream definition defines both the stream network and subbasin outlets. The procedure is similar to the process of manually adding or removing an outlet.

The threshold area defines the drainage area required to form the beginning of a stream. Draw a square around the reservoir to be removed by holding the left mouse button and moving the mouse.

Next step is Outlet and Inlet Definition. This tool is used to create watershed delineations using a combination of DEM, digitized network, and other user inputs. Double click the mouse left button to arcsway the polygon.

ArcSWAT (Texas A&M University) | UN-SPIDER Knowledge Portal

A prompt box will appear to announce completion of the watershed and subbasin delineation. In this exercise, we will not focus on adding or removing a reservoir. Click on the Calculate Subbasin Parameters button to estimate the subbasin parameters.

Turn on these two extensions. The Watershed Delineation tool will appear. Note By specifying the threshold area, we define the stream network for networking. Select the Load mask grid from disk option and click OK.


ArcSWAT (Texas A&M University)

It means that a minimum number of cells are required to start delineating the stream. A prompt box will be displayed asking for verification of the reservoir removal. At least one outlet must be selected for delineation. The loading and movement of runoff, sediment, nutrient and pesticide loadings to the main channel in each subbasin is simulated considering the effect of several physical processes that influence the hydrology.

These tools provide the capability similar to drawing and editing a polygon theme in ArcMap. Draw a box covering the desired outlet locations will set the main Watershed Outlets. You have the option of changing the size of the subbasins within the specified range of values. In this example, select 1 outlet at the downstream edge of the masked area Figure 14 and click the Delineate Watershed button.

The delineated watershed with subbasins will be added to the View. Select the mask grid located in your disk, and click ADD. When completed, you will see the following message: Click OK to completion of watershed delineation dialog box. Figure 15 shows the delineated watershed with subbasins.