Readme.txt: August 2025

   Willcox Model Information File
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This version of the Willcox Groundwater Flow Model is identical to the 2018 release; the files have simply been modified to run in command line and be imported to Groundwater Vistas. Additionally, only one version of the model (ACM1a) is provided in this format. The legacy versions are still available on ADWR's website.

The 2018 Willcox Groundwater Flow Model represents the regional hydrology and groundwater flow condition in the Willcox Basin and adjacent portions of
the Douglas and Aravaupa Creek groundwater basins.The model was developed and calibrated to simulate groundwater flow conditions 
in the Willcox Basin area during the pre-development era (steady state, circa 1940) and the transient period of groundwater 
development between 1940 and 2015 (75 years). The model was used to simulate a 100 year projection from 2016 to 2115.
Model documentation is provided in the Willcox Model Report from 2018. 

Suggestions to model users are detailed below. The model input and output files
are provided in separate folders.  

Notes to Modelers:

* The model was been developed using MODFLOW 2000 Version 1.19.01.

* The model will run in a DOS command window. 

* This model has 349 stress periods including 1 period of steady state and 348 periods of transient state. 

* Lower left coordinates of the model are longitude of 110.359316206693 W in degree decimal and latitude of 31.469625650395 N in degree decimal.

* The model will produce three binary data output files: head results (HDS), drawdown
 (DDN), and water budget(BGT).

**** Limitations: This is a regional-scale model suitable for basin-level analyses.

  
Thanks to all those who have rummaged through the data and found problems
and have been kind enough to point them out to the Department.


If you have any further questions, please contact the modeling unit at:

Emily LoDolce, PE
Section Manager-Groundwater Modeling 
Arizona Department of Water Resources
1110 W Washington Street, Suite 310
Phoenix, AZ 85007.

Phone: 602-771-8535
fax: 602-771-8686
email: hydrology@azwater.gov   
Website: https://www.azwater.gov/hydrology/groundwater-modeling/adwr-models

  



