The book can be downloaded at: 
https://gw-project.org/books/groundwater-resource-development/

This folder and its subfolders contain all the input and output files for 
Case Study #1: Hypothetical Stream-Aquifer System. The subfolder 
MODFLOW-NWT.Model contains a copy of the executable software for 
MODFLOW-NWT (version 1.1.4), which was used in the analyses of this problem, 
as described in the book. It also includes a copy of the model documentation 
report. The source code and additional documentation are available from links at:
https://www.usgs.gov/software/modflow-nwt-a-newton-formulation-modflow-2005. 

The Case Study includes three different scenarios, and the files for each are 
contained in separate subfolders, labeled (1) Base Case (No Recharge and No ET), 
(2) Low ET Case, and (3) ET and Recharge Case. Instructions for running a 
simulation for each case are provided below. The Base Case represents a scenario 
in which there is no areal recharge from precipitation and no evapotranspiration 
(ET) losses. The Low ET Case includes no areally diffuse recharge. The third 
scenario (ET.and.Recharge Case) includes both ET discharge (at a higher rate than 
in the previous case) and areal recharge from precipitation. 

The folder for each of the three scenarios includes a subfolder containing all 
the input files needed to run that simulation and a subfolder containing all the 
output files. The input file folder also includes the ModelMuse project file used 
to generate the input files (you do not need to use ModelMuse to run the simulation, 
although it is possible to do that). ModelMuse is a USGS public domain model 
pre- and post-processor 
https://www.usgs.gov/software/modelmuse-a-graphical-user-interface-groundwater-models 
The input folder also contains a batch file that can be used to run that simulation 
using those input files.  

RUNNING THE MODEL: There are a number of alternative ways that the input files 
for each scenario can be run with MODFLOW-NWT. We offer one straightforward way 
that is consistent for the three scenarios. Specifically, we have placed a batch 
file (name.bat) in each input folder (where name is the name of the scenario). 
Double-clicking on this batch file will cause it to execute a script contained 
within it. The scripts are written to link to the executable version of MODFLOW.NWT 
contained in the Model folder, to start executing it, and to provide it the name 
and location of the input files for each scenario. It will route all output files to 
the Output folder. Note that if you run (or re-run) the model with this folder and 
file configuration, the original output files will be overwritten and lost. If you 
want to save them for future comparisons, then you will first need to either rename 
the previous output files or move them to a separate new folder before running the 
simulation.  
