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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A minimum, maximum, and suggested sub watershed area in arcssat is shown in the drainage area box. A dialog box with Select option from Select from Map and Load from disk is opened. For the Stream Definition function of the Watershed Delineator, There are two ways to define the watershed and stream network. 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.

A stream network theme can be superimposed onto the DEM to define the location of the stream network.

Main Watershed Outlet s Selection and Definition. Exit the Watershed Delineation Dialog. Draw a box covering the desired outlet locations will set the main Watershed Outlets.

The user can add or remove reservoirs to refine the delineation process. The directory of this Geodatabase is provided by the interface, users should not change this value. These tools provide the capability similar to drawing and editing a polygon theme in ArcMap. Do not select an outlet at the upstream of another outlet.


The threshold area defines the drainage area required to form the beginning of a stream. In this section, the method based threshold area will be introduced. Before proceeding, you have a number of options: The Soil and Water Assessment Tool SWAT is a physically-based continuous-event hydrologic arcswta developed to predict the impact of land management practices on water, sediment, and agricultural chemical yields in large, complex watersheds with varying soils, land use, and management conditions over long periods of time.

ArcSWAT (Texas A&M University)

At least one outlet must be selected for delineation. Select the Load mask grid from disk option and click OK. However the general procedure is given below for reference. This tool is used to create watershed delineations using a combination of DEM, digitized network, and other user inputs. When completed, you will see the following message: If you have selected the Manually Delineate option, then a toolset will appear and allow you draw polygon mask.

A prompt box will appear to announce completion of the watershed and arvswat delineation. These maps are not required but might speed the processing time for the GIS operations. In order to use the threshold method to delineate the watershed and stream network, the Flow Direction and Accumulation needs to be calculated by clicking the button. In this exercise, we will not focus on adding or removing a reservoir.

If not, an error dialog will prompt. Choose Load from disk and select the DEM grid located in your disk and click add.

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

It means that a minimum number of cells are required to start delineating the stream. Click on the DRAW button to manually trace the boundary of the watershed area of interest using the mouse.


Double click the mouse left button to complete the polygon. A prompt box will be displayed asking for verification of the reservoir removal.

If the wrong subbasin is listed, click No and repeat step 7 2. Note By specifying the threshold area, we define the stream network for networking. The detailed procedures on how to use the Watershed Delineation tool are introduced in the following sections: Assuming the outlet and stream definition to be acceptable proceed to inlet definition for the study area.

Turn arcswst these two extensions. The user can change the Z unit to reflect the real situation. After loading DEMthe button will be activated.

Main Watershed Outlet s Selection and Definition In this step the users will select one or more outlet locations to define the boundary of the main watershed. Reservoirs The user can add or remove reservoirs to refine the delineation process. Hutorial the correct subbasin is listed, click Yes. Draw a square around the reservoir to be removed by holding the left mouse button and moving the mouse. Click EXIT in the watershed delineation main dialog.

The suggested area given in thtorial window is the average are that could be used.