Pinal Model History and Timeline

Pinal MODFLOW model development began in the late 1980's. Previous to the late 1980's, no numeric groundwater models within the Pinal AMA had been developed. Thomas Anderson (1968) developed an electric analog model simulating the groundwater depletion of Central Arizona between 1923 and 1964. Since the first ADWR Pinal MODFLOW release in 1990 the model has not been updated. The challenge in developing a model within the Pinal AMA is lack of measured data. The original ADWR MODFLOW model relied on data provided through a report by Hardt and Cattany entitled "Basic Groundwater Data for Western Pinal County"(1964).

In October 2007 the Pinal AMA MODFLOW model began the an initial phase of update that included both the steady state (circa 1900) and the transient model (1920-2006). The Pinal model update is expected to be completed in 2010.

Pinal Model Location

Pinal Model Map

The Pinal model grid encompasses approximately 1,575 square miles. [1.6MB pdf]

Pinal Model Datasets

• Model Files Referenced in ADWR Modeling Report No. 02
• 1985 to 1988 ADWR Calibrated Transient Pinal Model MODFLOW Datasets [40KB zip]
  

Pinal Model Reports and Documents

• (NEW) Regional Groundwater Flow Model of the Pinal Active Management Area: Provisional Report - Geology Update.  Modeling Report No. 20 (2010)

          [Report 63 MB pdf]   [Access Database ZIP file 283KB]

• Regional Groundwater Flow Model Phase One: Hydrogeologic Framework, Water Budget, and Phase One Recommendations. Wickham and Corkhill. Modeling Report No. 01 (1989) [9.4MB pdf]

• Pinal Active Management Area Regional Groundwater Flow Model Phase Two: Numerical Model, Calibration Sensitivity, and Recommendations. Corkhill and Hill . Modeling Report No. 02 (1990) [69MB pdf]

• Pinal Active Management Area Second Management Plan, Simulation of Water Use Scenarios Utilizing The Pinal AMA Regional Groundwater Flow Model. Corkhill and Plato. Modeling Report No. 04 (1992) [2.8MB pdf]

Questions?

      Contact the ADWR Modeling Unit (modeling@azwater.gov )