Introduction
Understand what SWAT Output Viewer does, including thematic mapping, time-series comparison, performance statistics, and scenario analysis.
Guidance for watershed modelers
Resources.
Find clear, practical guidance for setting up projects, running simulations, exploring outputs, comparing scenarios, and solving common SWAT problems.
START HERE
Get to the answer faster.
Follow the manual step by step, jump into a focused tutorial, or browse technical guidance whenever a model or workflow needs extra attention.
10 ITEMS
User manual
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Installation
Install the Windows desktop application and locate its default program folder.
SWAT Project
Organize scenarios, model input files, and watershed shapefiles in the project structure expected by the viewer.
Layout
Learn the toolbar, Project Explorer, main views, status bar, and the purpose of each workspace.
Importing Observed Data
Import daily, monthly, or yearly monitoring data and connect it to reaches, reservoirs, and calibration workflows.
Running Simulation
Select a scenario, model engine, and output interval, then run a SWAT simulation from the viewer.
Viewing Outputs
Explore watershed, HRU, subbasin, reach, and reservoir results using maps, tables, graphs, comparisons, and exports.
Comparing with Other Model Engine or Scenario
Compare two engines or scenarios and identify where their component-level outputs differ most.
Viewing Model Performance
Evaluate calibration results across locations and years with NSE, R², bias, RMSE, CVRMSE, NRMSE, and diagnostic plots.
Helper Functions
Open frequently used model files and folders, or copy a scenario into a SWAT-CUP project.
12 ITEMS
Videos
Map Legend is here!
Configure thematic-map colors directly from the map legend.
Integrate Modified SWAT Version in SWAT Viewer
Follow the complete workflow for compiling and connecting a modified SWAT engine.
Tutorial #3: Load Observed Data
Import observed data for performance evaluation and comparison.
Tutorial #2: Run Simulation
Choose an engine and output interval, then run a model from the viewer.
QSWAT vs. MWSWAT
Understand the project differences between the two GIS modeling interfaces.
Tutorial #1: Open SWAT Project
Open ArcSWAT, QSWAT, MWSWAT, and manually structured projects.
SWAT Output Spatial Visualization
Explore model results as thematic maps across subbasins and reaches.
Add Modified SWAT Version to SWAT Viewer
Register a customized SWAT executable with the viewer.
Compare SWAT Versions in SWAT Viewer
Compare results produced by two SWAT engines.
Manually Create SWAT Project to Use SWAT Viewer
Arrange model files and shapefiles without ArcSWAT or QSWAT.
Folder Structure of a SWAT Project
Learn the project folders the viewer uses for inputs, scenarios, and map layers.
SWAT: Input Conversion Error
Identify and resolve model-input formatting errors.
03 ITEMS
Tutorials
Tutorial #1: Open SWAT Project
Open ArcSWAT, QSWAT, MWSWAT, or manually structured projects.
Tutorial #2: Run Simulation
Choose an engine and output interval, then run a model from the viewer.
Tutorial #3: Load Observed Data
Import monitoring data for comparison and performance evaluation.
08 ITEMS
Using SWAT Viewer
Map Legend is here!
Configure thematic-map colors from the map legend.
QSWAT vs. MWSWAT
Understand the practical project-structure differences between QSWAT and MWSWAT.
SWAT Output Spatial Visualization
Use thematic maps to locate spatial patterns and watershed hotspots.
Manually Create a SWAT Project
Arrange model inputs and shapefiles when ArcSWAT or QSWAT is unavailable.
Model Structure of a SWAT Project
Learn how the viewer locates scenarios, model inputs, and map layers.
Quickly Check SWAT Model Performance
Calculate calibration indicators and compare simulated and observed series.
Switch Time for a Thematic Map
Change between single-period, annual, and average-annual summaries.
Export Annual Results to CSV
Export the selected annual watershed result for further analysis.
04 ITEMS
Customization & integration
Integrate Modified SWAT Version in Action
A step-by-step workflow for compiling and connecting a customized SWAT engine.
Add a Modified SWAT Version
Register a customized SWAT executable for analysis and comparison.
Compare SWAT Versions
Compare outputs from a modified engine with a baseline build.
Test a Customized SWAT Model
Compare research code with the official model using common inputs.
11 ITEMS
Debug SWAT
Compile and Debug SWAT with gfortran and Eclipse
A consolidated guide to inspecting SWAT source code with a free Fortran toolchain.
SWAT Changes from Rev 622 to Rev 627
Review notable source and parameter changes introduced in SWAT revision 627.
Single Document about Compiling and Debugging SWAT with GFortran and Eclipse
A single reference assembled from the original compilation and debugging series.
Makefile Updated: Single Makefile and 64-bit Builds
Use one makefile for debug, release, 32-bit, and 64-bit SWAT targets.
SWAT Makefile Updated: Ignore Underflow
Adjust floating-point traps to match official SWAT runtime behavior.
MinGW Installation Guide for SWAT Debugging
Install the free gfortran toolchain required by the Eclipse debugging workflow.
Debug SWAT in Eclipse: Utilize Makefile
Create an Eclipse makefile project with convenient build and debug targets.
SWAT Makefile Updated: Stop on Overflow
Add floating-point traps so unsafe calculations stop with a useful error location.
Makefile: Compile SWAT Using gfortran without Modification
Build SWAT from its Fortran sources with repeatable debug and release targets.
Eclipse-Compatible SWAT Updated to Rev 614
Update the Eclipse-ready source tree for the ET greater than PET correction.
Compile and Run SWAT with Photran and MinGW
Set up a free environment for building SWAT and locating mathematical errors.
06 ITEMS
ArcSWAT & modeling
Work Flow of Point Source and Reservoir Monthly/Daily Discharge File Generation
Understand how ArcSWAT creates measured point-source and reservoir discharge files.
Default CN2 in MGT
Trace the origin of the default SCS Curve Number written to management files.
Analysis of ArcSWAT Output Export
Examine how ArcSWAT imports text outputs into its results database.
Install ArcSWAT for ArcGIS 10 on ArcGIS 9.3: An Experiment
Results from testing a newer ArcSWAT build on an older ArcGIS installation.
Manually Install ArcSWAT
Extract and register ArcSWAT assemblies when the standard installer is unsuitable.
ArcSWAT Structure: Developer View
Map ArcSWAT’s extension, assemblies, databases, and command responsibilities.
05 ITEMS
Troubleshooting
Input Conversion Error
Identify model-input formatting problems that stop a simulation.
ArcSWAT Error: Try Inserting or Pasting Less Data
Resolve an ArcSWAT database-field capacity error.
SWAT Bug in Reading CHM Files
A legacy caution for models with more than six soil layers.
ArcSWAT Bug: Index Was Outside the Bounds of the Array
Diagnose a Create Tables failure associated with SSURGO soil records.
Find Possible Solutions for ArcSWAT Errors with ildasm.exe
Inspect .NET assemblies when an ArcSWAT command fails without accessible source code.
01 ITEMS
Product updates
Release history
A preserved record of published SWAT Output Viewer changes.