User's guide of Proceessing Modflow 5.0

Preface
Welcome to Processing Modflow: A Simulation System for Modeling Groundwater Flow and
Pollution. Processing Modflow was originally developed for a remediation project of a disposal
site in the coastal region of Northern Germany. At the beginning of the work, the code was
designed as a pre- and postprocessor for the groundwater flow model MODFLOW. Several years
ago, we began to prepare a Windows-version of Processing Modflow with the goal of bringing
various codes together in a complete simulation system. The size of the program code grew up,
as we began to prepare the Windows-based advective transport model PMPATH and add options
and features for supporting the solute transport models MT3D, MT3DMS and MOC3D and the
inverse models PEST and UCODE.
As in the earlier versions of Processing Modflow, our goal is to provide an integrated
groundwater modeling system with the hope that the very user-friendly implementation will
lower the threshold which inhibits the widespread use of computer based groundwater models.
To facilitate the use of Processing Modflow, more than 60 documented ready-to-run models are
included in this software. Some of these models deal with theoretical background, some of them
are of pratical values.
The present text can be divided into three parts. The first two chapters introduce PMWIN
with an example. Chapters 3 through 5 is a description part. Chapter 3 describes the use of
Processing Modflow; chapter 4 describes the advection model PMPATH and chapter 5
introduces the modeling tools provided by Processing Modflow. The third part, Chapter 6,
provides two tutorials and documents the examples.
Beside this text, we have gathered about 3,000 pages of documents related to the supported
models. It is virtually not possible to provide all the documents in a printed form. So we decided
to present these documents in an electronic format. The advantage of the electronic documents
is considerable: with a single CD-ROM, you always have necessary documents with you and we
save our nature by saving valuable papers and trees.
Many many people contributed to this modeling system. The authors wish to express heartfelt
thanks to researchers and scientists, who have developed and coded the simulation programs
MODFLOW, MOC3D, MT3D, MT3DMS, PEST and UCODE. Without their contributions,
Processing Modflow would never have its present form. Many thanks are also due to authors of
numerous add-on packages to MODFLOW.
We wish to thank many of our friends and colleagues for their contribution in developing,
checking and validating the various parts of this software. We are very grateful to Steve
Bengtson, John Doherty, Maciek Lubczynski, Wolfgang Schäfer, Udo Quek, Axel Voss and
Jinhui Zhang who tested the software and provided many valuable comments and criticisms. For
their encouragement and support, we thank Ian Callow, Lothar Moosmann, Renate Taugs, Gerrit
van Tonde and Ray Volker. The authors also wish to thank Alpha Robinson, a scientist at the
University of Paderborn, who checked Chapter 3 of this user’s guide. And thanks to our readers