is an object oriented library written in Fortran 2003/2008 for solving coupled nonlinear convection-diffusion-reaction equation in the following scheme

where
is allocatable dimension of the class `pde`

DRUtES © was originally developed for solving the Richards equation and governing equations for transport of solutes in porous media. Currently the following problems are implemented:

- Richards equation in pressure head form
- Richards equation in total hydraulic head form
- Richards equation in dual permeability concept
- Boussinesq equation
- Heat conduction equation with convective term (Sophoclea, 1979)
- Advection-dispersion-reaction equation with kinetic sorption (Freundlich and Langmuir models)
- Kinematic wave equation

Both rectangular and cylindrical coordinates are supported

DRUtES © can solve the nonlinear problem both with a standard Picard method and with so called dd-adaptivity.

Download the source code at
`
https://github.com/michalkuraz/drutes-dev/releases
`

or git the development version by
`git clone https://github.com/michalkuraz/drutes-dev.git`

Use Un*x based system only (Linux distros like Debian, Ubuntu, Slackware, Red Hat, etc., or Mac OS X)

- git
- tar
- GNU make
- gcc, gfortran (> 8.0)
- scilab (optional, can be used for displaying your output files for domains )

- On Debian based distro type with superuser privileges

`apt-get install tar make gcc gfortran git`

- check your gcc version

`gcc -v`

If gcc version higher than 8 you can continue, if not update your system if you really want to use drutes.

- Unpack the sources, and change your current directory

`tar -xzf drutes-dev*.tar.gz && cd drutes-dev*`

- Compile the sources (it's really easy).

`make`

- If everything worked out correctly DRUtES © is now installed on your system, edit files in
`drutes.conf`, execute computation with

`bin/drutes`

in your DRUtES © directory

If anything unclear, or you have interesting tasks to solve, don't hesitate to contact the chief developer Michal Kuraz ( `kuraz(a)fzp.czu.cz` )

**Michal Kuraz** ( `kuraz(a)fzp.czu.cz` ) - chief developer ( Department of Water Resources and Environmental Modeling, Czech University of Life Sciences Prague )

**Petr Mayer** ( `petr.mayer(a)cvut.cz` ) - linear algebra, matrix structures and solvers (Department of Mathematics, Czech Technical University in Prague)

**Johanna Bloecher** ( `jorub(a)me.com` ) - dual permeability model, inverse modeling, freezing and melting, evaporation ( Department of Water Resources and Environmental Modeling, Czech University of Life Sciences Prague )

DRUtES © is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/