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Introduction

This Wiki page outlines recommended steps for conversion of an XPSWMM model to TUFLOW.

XPSWMM is a flood and urban stormwater drainage modeling software developed by Autodesk (previously Innovyze and XP Solutions). The XPSWMM solution uses EPA SWMM for its 1D calculations, dynamically linked to TUFLOW for its 2D calculations. The software functions within a custom build Graphical User interface (GUI). During simulation, XPSWMM calls a TUFLOW dynamic library for the 2D calculations. As XPSWMM uses TUFLOW for its 2D engine, XPSWMM and TUFLOW use the same 2D solution and will achieve identical results if configured in a like-for-like way.

Common user feedback suggests the XPSWMM GUI is useful for simple modeling projects; however, it can become cumbersome and inefficient in workflow when dealing with larger datasets and/or a large volume of different scenario and event simulations. In response to requests from USA XPSWMM users who want to convert XPSWMM models into a native TUFLOW format, TUFLOW linkage with 1D EPA Storm Water Management Model (SWMM) was added as a supported feature in TUFLOW 2023-03-AD release. The modeling workflow in TUFLOW differs from XPSWMM, as TUFLOW modeling is integrated with QGIS (Geographical Information System) GIS software. This GIS integration is well-suited for working with larger datasets. Additionally, the structural design associated with TUFLOW modeling makes its general workflow extremely efficient, particularly for the automated management of multiple scenarios and events.

If you are building a TUFLOW SWMM model from scratch, not from XPSWMM, please refer to the TUFLOW SWMM Tutorials. Tutorials are provided for the following topics:

TUFLOW SWMM Module 1 - 1D SWMM Culverts
TUFLOW SWMM Module 2 - 1D SWMM Pipe Network / 2D TUFLOW Direct Rainfall Hydrology
TUFLOW SWMM Module 3 - 1D SWMM Pipe Network / 1D SWMM Urban Hydrology
TUFLOW SWMM Module 4 - 1D SWMM Pipe Network / 1D SWMM Urban Hydrology: Executing multiple different event simulations from a single model control file.

TUFLOW Licensing / XPSWMM Discount

If you are an existing / or past XPSWMM perpetual license owner who would like to purchase a TUFLOW license, please contact sales@tuflow.com. You may be eligible for an XPSWMM / TUFLOW discount in recognition of past royalties Autodesk paid TUFLOW when you purchased an XPSWMM perpetual license.

Dataset Download

The XPSWMM model used for this model conversion demonstration is available for download here: XPSWMM to TUFLOW Model Conversion Dataset. A copy of the completed converted model can be downloaded at the end of the page.

If you are using this example conversion dataset, please rerun the XPSWMM model before beginning the conversion process. This will generate the XPSWMM TUFLOW files and establish the correct file paths within them, aligning with the location where you have saved the dataset on your computer.

XPSWMM to TUFLOW Model Conversion

Two Dimensional (2D) Model Elements

XPSWMM writes TUFLOW model files when it pre-processes the model inputs defined in its GUI (prior to the hydraulic calculations). Using default settings, XPSWMM typically writes the TUFLOW files to the 2D\Data folder. follow these steps to extract and format the XPSWMM / TUFLOW 2D model features.

One Dimensional (1D) SWMM Model Elements

The 1D culvert, pipe network and sub-catchment hydrology EPA SWMM items in the XPSWMM model need to be exported from the software and reconfigured for use by TUFLOW. Please follow the suggested workflow and instructions outlined below:

TUFLOW Control File Updates

The linking between the 2D TUFLOW model and 1D SWMM is established within the TUFLOW control files. The following steps outline the basic commands needed to complete the linking process and execute the model. The following steps will require use of a text editor. The tutorial demonstration uses Notepad++. For its configuration information refer to Notepad++ Tips. For a clean and organized model, it is recommended to name all the TUFLOW control files similarly. For example, 1D2D_Urban_001.tscf, 1D2D_Urban_001.tbc, 1D2D_Urban_001.tgc and 1D2D_Urban_5m_001.tcf.

Note: For this demonstration, all commands will reference the datasets in the provided conversion model. Please update these references with the filenames used in your model.

TUFLOW Simulation Execution

Converted Dataset

After completing the model conversion steps outlined above, you can download the converted TUFLOW SWMM model dataset using the following link: <<link>> This dataset includes both the original XPSWMM model and the converted TUFLOW model. We recommend checking your converted TUFLOW model against the provided one to ensure all conversion steps were completed correctly.

Feedback / Suggestions

If you have any suggestions to be included in these pages, please email support@tuflow.com.

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XPSWMM to TUFLOW-SWMM

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