Webinar instructions will be emailed before the date of the webinar.
Please log into the webinar 15 – 30 minutes before start time.

A Two-Day, Live, Interactive Webinar

Day One: Thursday, October 26, 2023
9:00 am – 12:20 pm CDT

Day Two: Friday, October 27, 2023
9:00 am – 12:20 pm CDT

Presented by Dr. Gordon McCurry, P.G.

Agenda Day One:
Overview of Groundwater Modeling

  • Common purposes and uses of groundwater models
  • Types of groundwater models
  • General process of groundwater modeling

Principles of Groundwater Flow and Solute Transport

  • Aquifers and aquifer properties
  • Groundwater flow and hydraulic gradient
  • Solute transport processes

Analytical Groundwater Models

  • Steady and transient flow
  • Stream depletion due to pumping
  • Solute transport

Agenda Day Two:

Numerical Flow Model Development

  • Governing equation for groundwater flow
  • Model domain and discretization
  • Model boundary conditions (fluxes)
  • Model material properties

Numerical Flow Model Calibration and Reporting

  • Model calibration
  • Model documentation


  • Design of MODFLOW
  • MODFLOW processes and packages
  • MODFLOW discretization
  • MODFLOW example

Webinar Instructions

All attendees must log-on through their own email – attendees may not watch together if they wish to earn continuing education credit. HalfMoon Education Inc. must be able to prove attendance if either the attendee or HalfMoon Education Inc. is audited.

Certificates of completion can be downloaded in PDF form upon passing a short quiz. A link to the quiz will be sent to each qualifying attendee immediately after the webinar. The certificate can be downloaded from the Results page of the quiz upon scoring 80% or higher.

Webinars are presented via GoToWebinar, an easy-to-use application that can be run on most systems and tablets. Instructions and login information will be provided in an email sent close to the date of the webinar. It is highly recommended that you download, install and test the application before the webinar begins by clicking on the link in the email.

GoToWebinar App requirements:
Windows 7 – 10 or Mac OSX Mavericks (10.9) – macOS Catalina (10.15)

Web Browser:
The two most recent version of the following browsers:
Google Chrome, Mozilla Firefox, Apple Safari, Microsoft Edge
Internet Explorer v11 (or later) with Flash enabled

Internet connection: Minimum of 1Mbps       Hardware: 2GB RAM or more

For more information, visit the Support section at


Professional Engineers:
6.0 PDHs

Practicing Institute of Engineering:
6.0 PDHs 

Floodplain Managers:

6.0 PDHs*

*This webinar may offer up to 6.0 PDHs to licensed geologists in some states. HalfMoon Education has not applied for state geologist continuing education approval in states requiring course preapproval.

Continuing Education Credit Information

This webinar is open to the public and is designed to qualify for up to 6.0 PDHs for professional engineers in most states that allow this learning method. Please refer to specific state rules to determine eligibility.

This webinar has been evaluated by the Practicing Institute of Engineering for evaluation of compliance with the NYS Mandatory Continuing Education Requirements and approved for 6.0 PDHs in the fields of professional engineering and geology. 

The Association of State Floodplain Managers has approved this course for 6.0 CECs for floodplain managers.

This webinar may offer up to 6.0 PDHs to licensed geologists in some states. HalfMoon Education has not applied for state geologist continuing education approval in states requiring such.

Attendance will be monitored, and attendance certificates will be available after the webinar for those who attend the entire course and score a minimum 80% on the quiz that follows the course (multiple attempts allowed). 

On-Demand Credits

The preceding credit information only applies to the live presentation. This course in an on-demand format may not be eligible for the same credits as the live presentation; please consult your licensing board(s) to ensure that a structured, asynchronous learning format is appropriate. The following pre-approvals may be available for the on-demand format upon request:



Dr. Gordon McCurry, P.G.

Hydrologist at McCurry Hydrology LLC

Dr. McCurry has more than 35 years of experience in hydrology, including the investigation, analysis and modeling of aquifer systems, and assessments of hydrologic impacts. His areas of expertise include the quantitative analyses of flow and solute transport, stream/aquifer interactions, climate change, regulatory permitting, and aquifer remediation. He has been involved with modeling groundwater flow and solute transport since the 1980s. In addition to his consulting career, Dr. McCurry has taught courses on groundwater modeling and hydrogeology since the early 1990s at several universities and to state and federal regulatory agencies.