FAQ

HYDRUS FAQ

Frequently asked questions - Hydrus-1D and HYDRUS 2D/3D:

1. Problem with Hydrus-1D installation
2. Installation and Use of HYDRUS 2D/3D on Windows Vista
3. ORTHOMIN Terminates – too many iterations, time step reduced
4. How to run computational modules outside of GUI ?
5. Could one use HYDRUS (2D/3D) for one-dimensional simulations ?
6. Should I use solute flux or solute concentration boundary conditions?
7. What to do when x-y graphs do not show up?
8. Notes on Spatial and Temporal Discretization
9. I cannot run HYDRUS-1D executable modules even for preinstalled projects
10. I cannot modify intervals in the spectrum when displaying small values (e.g., for concentrations).
11. Running computational modules in a batch.
12. Why may water fluxes in the v.out and Boundary.out files differ?
13. What is the difference in spatial discretization for groundwater and vadose zone problems?
14. What are the most commonly used bottom boundary conditions?
15. How to edit manually HYDRUS (2D/3D) input files?
16. How to copy x-y line graphs to other applications?
17. How to copy/send HYDRUS projects to another computer/user?
18. What are values for various nitrate root uptake parameters?
19. What does it means when my output shows NaN?
20. How to display the HYDRUS animation in the PowerPoint presentation?
21. The use of decimal points and/or decimal commas on PC with different regional settings.
22. Notes on units in HP1.
23. Can HYDRUS consider surface runoff or overland flow?
24. What does HYDRUS-1D do when soil temperatures drop below freezing?
25. Why the numerical solution does not converge for fine-textured soils and how to improve the convergence?
26. -2 cm air entry option in the van Genuchten-Mualem soil hydraulic functions.

Frequently asked questions - Hydrus-2D (old version 1997-2005)

1. New features in version 2.0 of Hydrus-2D
2. Maximum number of optimized parameters
3. Overland flow
4. Conversion of projects from previous versions
5. The maximum allowed pressure at the soil surface, hCritS
6. The minimum allowed pressure at the soil surface, hCritA
7. Potential Evapotranspiration
8. Hydrostatic conditions as initial condition
9. Variable head boundary condition
10. Compilation of the Fortran code without MSLIB
11. Moving of concentration and moisture fronts
12. Differences between velocities in v.out and in Boundary.out
13. Contour levels
14. Missing *.h2d files
15. How to generate random scaling factors for part of the domain ?
16. Operating systems (Windows 2000)
17. Fluxes through a plane of interior nodes
18. Fluxes along specific portions of boundaries
19. Concentrations in the objective function
20. Output concentrations
21. Hydrus-1D versus Hydrus-2D; reasons to get both
22. Installation and manuals
23. Nonequilibrium solute transport
24. Atmopheric BC on a potential Seepage Face
25. Parameter l in the hydraulic conductivity function
26. Quick disappearance of the Execute DOS window
27. Running model in a batch
28. Time variable boundary conditions
29. Solute transport BC - Pointer to the vector of boundary conditions
30. Soil hydraulic parameters
31. "Export All" option
32. Network installation of the Hydrus-2D