AVSWAT - X short Tutorial. Prepared by Mauro Di At ftp://fruchbabefonbei.tk swat/pc/soilav/ download the soils data, zipped by state. 2. SWAT USER'S MANUAL, VERSION WATERSHED CONFIGURATION. The first step in setting up a watershed simulation is to partition the watershed. ArcSWAT. ArcGIS Interface for Soil and Water Assessment Tool (SWAT) . Temple, Texas. The manual can also be downloaded from the SWAT Web site.
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SWAT is a popular model among many watershed hydrologists who are interested in studying The objective of this tutorial is to expose users to some. SWAT is a popular model among many watershed hydrologists who are interested in studying the The objective of this tutorial is to expose users to some of. Assessment Tool Theoretical Documentation and User's Manual, Version distributed as an Adobe pdf file with the ArcSWAT installation package. 2.
Setting up a SWAT Model with ArcSWAT
Click OK. After few seconds, you should get a project set-up done message.
Click OK to proceed. After the project setup is done, go ahead and start the watershed delineation process. They should be in an appropriate projected coordinate system.
Once the watershed delineation window is activated, click on the open file button 1 in the figure below in DEM setup portion, and then click on select from map, and then select your project DEM. Lets skip the Mask and Burn in option, and proceed to creating flow direction and flow accumulation grids.
By leaving the default DEM based option unchanged in the stream definition portion, click on Flow direction and accumulation button 2 in figure below. This is the critical stream area threshold that you will use to define the stream network. For your project, if the watershed area is X km 2 what is the area of the watershed that you are delineating?
So change the Area accordingly 3 in the figure above , and click the Create stream and outlets button 4 to create stream network, subbasins and outlet for each of the subbasin. Next, in the watershed outlets selection and definition, click on the select Whole watershed outlet button 5 , and then select your desired outlet location using the cursor as shown below the outlet location is the USGS gaging point that is provided to you.
You can use the undo button if you have mistakenly selected a wrong outlet. If outlet does not exit at the point you are interested in, use the Add button in Edit Manually frame 9 in the figure above to add a point, and then do the selection using the outlet 5 button.
Click on the delineate watershed button to delineate the watershed. Click OK on the delineation done message.
After the watershed is delineated, you will see that a polygon feature class with subbasins is added to the map document. If you open its attribute table shown below , you will see that it does not have any hydrology or watershed specific attributes e. Click on the Calculate subbasin parameters button 7 to populate the watershed feature class with necessary attributes for SWAT model.
Be patient because this process takes some time. After all attributes are calculated, click OK on the final message box.
Now open the attribute table if you closed it , and you will see that it has more attributes as shown below. You are done with delineating the watershed and creating sub-basins for a specific threshold area.
Exit the watershed delineation window by clicking on Exit. After you exit, the program will do some more processing, cleaning-up of data, etc.
Save the map document.
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After you are done with watershed delineation, the next step is to create HRUs by using land use, soil and elevation slope information. Next, you will clip this raster to the DEM for the study area. The case of a small forested watershed. Hydrological processes 30 1 Journal of Hydrology 10 3 Accessed: Apr 11, Journal of Hydrology 7 1 Tese, Lavras, Universidade Federal de Lavras.
Water Resources Management 24 1 Current Science 40 9 Advanced Geoscience 21 1 Biota Neotropica 10 4 Transactions of the ASAE 46 6 The SWAT sub-daily simulations were carried out for a total of 18 rainfall events, 9 each for calibration and validation.
Overall trend and extent of matching simulated flow for the rainfall events in — with measured data during the calibration process were coefficient of determination R 2 value of 0. For validation, R 2 and E NS values were 0.
Whereas R 2 and E NS values for simulation results using daily rainfall data were 0. The importance of higher time resolution hourly precipitation records for flow simulation were evaluated by comparing R 2 and E NS with 15 min, 2 h, 6 h and 12 h precipitation data, which resulted in lower statistics with increases in time resolution of precipitation data.
From the results obtained in this study, hourly precipitation record for SWAT sub-daily with Green-Ampt infiltration method was proven to be efficient for runoff estimation at field sized watershed with higher accuracies that could be efficiently used to develop sitespecific Best Management Practices BMPs considering rainfall intensity, rather than simply using daily rainfall data.
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Natalia Uribe Rivera
References 1. Evaluation of annualized agricultural nonpoint source model for a watershed in the siwalik hills of Nepal.
Predicting rainfall erosion losses. Agricultural Handbook, Google Scholar 3.Calderon, D.
She started her PhD in February After you exit, the program will do some more processing, cleaning-up of data, etc. For the downstream regions, its flow formation process is predominantly associated with the components of the base flow.
Clipping is done by using ArcToolbox in ArcMap. This will finish the soil data processing for HRU analysis.
Thesis Uribe N.
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