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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Select YES in the following dialog to continue with the delineation of main watershed and subbasins. Click OK to completion of watershed delineation dialog box. This function calculates basic watershed characteristics from the DEM and sub-watershed themes. Main Watershed Outlet s Selection and Definition. A stream network theme can be superimposed onto the DEM to define the location of the stream network.
If the correct subbasin is listed, click Yes. 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.
Add DEM Grid 1. However the general procedure is given below for reference. This feature allows adjacent watershed to be simulated at the same time using SWAT.
Before proceeding, you have a number of options: 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, sediment, and agricultural chemical yields in large, complex watersheds with varying soils, land use, and management conditions over long periods of time.
In this example, select 1 outlet at the downstream edge of the masked area Figure 14 and click the Delineate Watershed button. Click beside Maskthen three options is available to specify the watershed area of interest: If the wrong subbasin is listed, click No and repeat step 7 2. At least one outlet must be selected for delineation.
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. This tool is used to create watershed delineations using a combination of DEM, digitized network, and other user inputs. Click on the DRAW button to manually trace the boundary of the watershed area of interest using the mouse. These tools provide the capability similar to drawing and editing a polygon theme in ArcMap.
The directory of this Geodatabase is provided by the interface, users should not change this value. If you have selected the Manually Delineate option, then a toolset will appear and allow you draw polygon mask. A prompt box will be displayed asking for verification of the reservoir placement. The user can add or remove reservoirs to refine the delineation process.
ArcSWAT (Texas A&M University) | UN-SPIDER Knowledge Portal
Next step is Outlet and Inlet Definition. Note By specifying the threshold area, we define the stream network for networking.
This function plays an important role in determining the detail of the stream network and the size and number of subbasins created.
These two Geodatabases will be created under the Project Directory. Inlets tutorixl any point source loading into the study area or the inlets of drainage into the watershed from an upstream area.
The delineated watershed with subbasins will be added to the View. You have the option of changing the size of the subbasins within the specified range of values.
In this section, the method based threshold area will be introduced. A prompt box will appear to announce completion of the watershed and subbasin delineation. You can view the area tutoriaal percentage wise distribution of elevation for the entire watershed and each subbasin. 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.
Do not select an outlet at the upstream of another outlet. A prompt box will be displayed asking for verification arcswqt the reservoir removal. The DEM properties should correctly define the grid size and units. The Watershed Delineation tool will appear. Draw a square around the reservoir to be removed by holding the left mouse button and moving the mouse.
Reservoirs The user can add or remove reservoirs to refine the arcssat process. The reservoir will be placed at the outlet of the subbasin. In this exercise, we will not focus on adding or removing a reservoir. The detailed procedures on how to use the Watershed Delineation tool are introduced in the following sections: These maps are not required but might speed the processing time afcswat the GIS operations.
The suggested area given in this window is the average are that could be used. Exit the Watershed Delineation Dialog. Assuming the outlet and stream definition to be acceptable proceed to inlet definition for the study arcwsat.
When completed, you will see the following message: The user can change the Z unit to reflect the real situation. After setting the threshold value of subbasin, then the user can delineate the stream network and outlets through clicking the button.
ArcSWAT (Texas A&M University)
A dialog box with Select option from Select from Map and Load from disk is opened. 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.
Draw a box covering the desired outlet locations will set the main Watershed Outlets. Stream definition defines both the stream network and subbasin tutorizl.
The results of the calculations are stored as additional fields in the streams and subbasins theme database files.