Berkowitz (2020) Modeling non‐Fickian solute transport due to mass transfer and physical heterogeneity on arbitrary groundwater velocity fields, Water Resources Research, 56(10), e2019WR026868, doi:10.1029/2019WR026868. Berkowitz (2020) Aurora: A non-Fickian (and Fickian) particle tracking package for modeling groundwater contaminant transport with MODFLOW, Environmental Modelling and Software, 134, 104871, doi:10.1016/j.envsoft.2020.104871. Aurora - CTRW Particle Tracker with MODFLOW Unzip all the files contained in 'CTRW-FEM package and manual.zip'. The directory named 'CTRW-FEM package and manual' has now been created on your disk. A detailed, step-by-step 'User's Guide' appears in the directory, as the file 'UserManual_CTRW-FEM-Package_v3-2.pdf'. The Toolbox (called 'CTRW-FEM package and manual.zip') can be downloaded here (5.4 MB). Several examples clearly demonstrate how to work with the Package in many typical analyses. This version includes corrections for some boundary conditions and small updates to the User's Guide. Version 3.2 (January 2019) contains a User's Guide and accompanying files with easy-to-use format.

A variety of inlet and outlet boundary conditions are implemented.

The velocity field may also be calculated by applying a Darcy 2D solver. The software enables both 'forward' modeling and 'inverse' (best-fit) modeling of experimental data (the latter is currently limited to 1D). The chemical species may be inert or reactive. The CTRW-FEM Package contains software to model non-Fickian (as well as Fickian) transport, using a FEM solution technique in 1D or 2D for general geometry and grid. Run MATLAB and change the working directory to CTRW_v4.0. A detailed, step-by-step 'Practical User's Guide' appears in the CTRW_v4.0 directory, as the file 'CTRW_v4.0_UserGuide.pdf'. The directory named 'CTRW_v4.0' has now been created on your disk. Unzip all the files contained in 'CTRW_v4.0.zip'. The Toolbox (called 'CTRW_v4.0.zip') can be downloaded here (437 KB).

The CTRW Toolbox can be run in Matlab (tested on versions 6.1 and higher) on any platform. This version includes improvements to the input files and explanations in the User's Guide, as well as some small improvements to the numerics. Several examples clearly demonstrate how to work with the Toolbox in many typical analyses. Version 4.0 (May 2017) contains a User's Guide and accompanying files with easy-to-use format. A variety of inlet and outlet boundary conditions, and types of transport, are implemented. The software enables both 'forward' modeling and 'inverse' (best-fit) modeling of experimental data. The CTRW MATLAB TOOLBOX contains software to model non-Fickian (as well as Fickian) transport. MAIN SOFTWARE PACKAGES AVAILABLE HERE: (1) The CTRW MATLAB Toolbox ( Version 4.0) and (2) The CTRW-FEM (Finite Element Method) Package ( Version 3.2) The CTRW MATLAB Toolbox

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