Surface Water Assessment eNabler (SWAN)

    swan_5_logo      swan_ecpa_logo

    The ‘Surface Water Assessment eNabler’ (SWAN) is a software tool to assist in assessing the environmental impact of new crop protection applications. The system allows the user to incorporate mitigation measures for spray drift and run-off of pesticides into FOCUS Surface Water Step 4 calculations.

    SWAN Usage and Distribution

    SWAN is and will be distributed on a free to use basis subject to the conditions stated in the Software Licence. You must agree to these terms before downloading, installing, distributing or using SWAN.


    Please direct all enquiries on SWAN to:

    Installing SWAN

    To install SWAN download the appropriate installer and follow the steps of the installer.  See the release notes for further information on installation and supported SWASH tools versions.


    Version 5.0

    Tested on 64-bit editions of Windows 7 and Windows 10. 32-bit operating systems should be compatible but have not been tested. Not compatible with Windows versions earlier than Windows 7.

    SWAN 5.0 Installer Zipped

    SWAN 5.0 Portable

    SWAN 5.0 Release Notes

    Version 4.0.1

    Tested on Windows XP and Windows 7.

    SWAN 4.0.1 Installer Zipped

    SWAN 4.0.1 Portable

    SWAN 4.0.1 Release Notes

    Version 3.2

    Tested on Windows XP and Windows 7.

    SWAN 3.2 Installer Zipped

    SWAN 3.2 Release Notes

    Windows 10 Compatibility

    Version 5.0 of SWAN is fully compatible with Windows 10.

    Versions 3.2 and 4.0.1 of SWAN may fail when running VFSMod on some Windows 10 installations.  A hotfix patch is provided with the installers to make the installation compatible with Windows 10; see the “README” for further details.  This hotfix is provided for the convenience of users but for full Windows 10 compatibility, users should update to SWAN 5.  No hotfix is available for the portable edition of SWAN 4.0.1.

    Multiple SWAN Installations

    SWAN 3.2 can be installed alongside either SWAN 4.0.1 or SWAN 5.

    SWAN 4.0.1 and SWAN 5 are mutually exclusive, but SWAN 5 is compatible with projects using the SWASH tool set associated with SWAN 4.