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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Figure 15 shows the delineated watershed with subbasins. A prompt box will be displayed asking for verification of the reservoir placement. The DEM properties should correctly define the grid size and units.

EDIT Vertex will allow you to adjust the arcswxt of the mask. The results of the calculations are stored as additional fields in the streams and subbasins theme database files.

ArcSWAT (Texas A&M University)

Before proceeding, you have a number of options: The delineated watershed with subbasins will be added to the View. Arcswqt dialog box with Select option from Select from Map and Load from disk is opened. Exit the Watershed Delineation Dialog.

These tools provide the capability similar to drawing and editing a polygon theme in ArcMap. Reservoirs The user can add or remove reservoirs to refine the delineation process. 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.

To add a reservoir, click on the ADD button and with the cross appearing as mouse pointer, click on the subbasin where the reservoir will be added. It means that a minimum number of cells are required to start delineating the stream.


Draw a box covering the desired outlet locations will set the main Watershed Outlets.

These maps are not required but might arcswar the processing time afcswat the GIS operations. Go to the View menu of ArcMap, hover the mouse over the Toolbar button, a list of tools will appear. This function calculates basic watershed characteristics from the DEM and sub-watershed themes. You have the option of changing the size of the subbasins within the specified range of values. At least one outlet must be selected for delineation.

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.

Add DEM Grid 1. If the correct subbasin is listed, click Yes. Turn on these two extensions.

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

How to Create a Project. Click beside Maskthen three options is available to specify the watershed area of interest: The Watershed Delineation tool will appear. The minimum threshold area is for the entire watershed, not for each sub watersheds that are going to be delineated. Stream definition defines both the stream network and subbasin outlets.

Inlets represent any point source loading into the study area or the inlets of drainage into the watershed from an upstream area. After loading DEMthe button will be activated.

The Soil and Water Assessment Tool SWAT is a physically-based continuous-event hydrologic model developed to predict the impact of land management practices on water, arcsaat, and agricultural chemical yields in large, complex watersheds with varying soils, land use, and management conditions over long periods of time.

This feature allows adjacent watershed to be simulated at the same time using SWAT. The suggested area given in this window is the average are that could be used.

Select YES in the following dialog to continue with the delineation of main watershed and subbasins. The procedure is similar to the process of manually adding or removing an outlet.


The reservoir will be placed at the outlet of the subbasin.

Next step is Outlet and Inlet Definition. In this exercise, we will not focus on adding or removing a reservoir. If not, an error dialog will prompt.

Main Watershed Outlet s Selection and Definition. The detailed procedures on how to use the Watershed Delineation tool are introduced in the following sections: After setting the threshold value of subbasin, then the user can delineate the stream network and outlets through clicking the button. Do not select an outlet at the upstream of another outlet. If the wrong subbasin is listed, click No and repeat step 7 1. A prompt box will be displayed asking for verification of the reservoir removal.

A stream network theme can be superimposed onto the DEM to define the location of the stream network. However the general procedure is given below for reference. The threshold area defines the drainage area required to form the beginning of a stream.

If you have selected the Manually Delineate option, then a toolset will appear and allow you draw polygon mask. Select the Load mask grid from disk option and click OK.

For the Stream Definition function of the Watershed Delineator, There are two ways to define the watershed and stream network. Click on the Calculate Subbasin Parameters button to estimate the subbasin parameters. The drainage network and stream juncture points, used to define subbasin outlets, are displayed on the DEM map grid.

Click EXIT in the watershed delineation main dialog. When completed, you will see the following message: