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Andrew Cohen

Effect of Aquitards on Groundwater Plume Migration and Drinking Water Quality

Communication and Education, Expert Witness and Legal Support, Modeling, PFAS /

This abbreviated animation demonstrates a basic groundwater contamination scenario, highlighting the important role of an aquitard.   An aquitard is a low-permeability geologic layer (e.g., clay) in limiting the vertical migration of contaminated groundwater. It illustrates how, in the absence of such a protective horizon, pumping from a municipal drinking water supply well can draw […]

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Introduction to Groundwater Contamination in Fractured Rock

Chlorinated Solvents and DNAPL, Communication and Education, Fractured Rock Hydrogeology /

This webinar excerpt explores how contaminants migrate through fractured bedrock aquifers, a critical and complex aspect of hydrogeology. Unlike groundwater flow in unconsolidated materials (such as sand and gravel), fractured rock environments create highly variable and unpredictable pathways for contamination.   The video examines a cross-section of fractured sandstone and siltstone, highlighting key hydrogeologic processes,

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Understanding Plume Migration and Depiction Using Maps

Communication and Education, Expert Witness and Legal Support, Fate and Transport, PFAS, Visualization /

This short educational video illustrates how PFAS from AFFF (aqueous film-forming foam) migrates through the subsurface and impacts groundwater systems. Designed for a broad audience, including policymakers, attorneys, and the general public, it explains key hydrogeologic principles using a clear visual sequence. You’ll learn:   How aquitards can restrict the vertical migration of PFAS, even

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“A Civil Action” – Example Effect of Groundwater Contamination

Communication and Education /

The following summary is from the Environmental Hydrogeology course I taught at Montclair State University in 2012. I was not involved in the project/case – it was well before my time.   In the 1960’s, the city of Woburn, MA starting using two wells as part of their water supply (Wells G & H, below).

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Modeling Contaminant Transport – NJIT

Chlorinated Solvents and DNAPL, Communication and Education, Fate and Transport /

Modeling Contaminant Transport, CHE 702 3 credits, Fall 2018 Mondays, 6:00-9:05, FMH 409 Instructor: Dr. Andrew JB Cohen Contact Info: ajbcohen@njit.edu   Overview This course focuses on the description, analysis, and prediction of the fate and transport of chemicals in groundwater, soil, and sediment. Principles of contaminant transport and associated mathematical and numerical models will

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Custom 4D Groundwater Data Exploration Tool

Chlorinated Solvents and DNAPL, Forensic Hydrogeology, Fractured Rock Hydrogeology, Site Assessment and Characterization, Unique Analytical Methods, Visualization /

This tool was developed in the course of a complex fractured rock site investigation involving more than 1,100 monitoring wells and groundwater samples analyzed for numerous chemical constituents. The site presented significant challenges: multiple contaminant plume sources, migration through dipping and variably oriented fracture zones, the presence of a fault zone, and a highly three-dimensional

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Introduction to GroundwaterU – An Online Library of Educational Videos

Non-Profit /

In this webinar, hydrogeologist Andrew Cohen introduces GroundwaterU.org, a global, open-access platform curating high-quality educational videos on groundwater science, policy, and engineering. He outlines what the website contains and how the user interface, what defines a “high-quality” learning video, and why this initiative fills a critical gap in groundwater education. Cohen emphasizes the importance of

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What Makes a High-Quality Educational Presentation and Video?

Communication and Education, Non-Profit /

This presentation discusses what constitutes an effective educational presentation (e.g., PowerPoint), which can then be saved as a video. In particular, based on experience and research, a “high-quality” presentation includes multimedia content, consistent with multimedia learning principles, which are described below.   The presentation is part of a longer webinar recording presented to the Groundwater

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Publications & Presentations

Communication and Education /

Book Cohen, Andrew J.B., and John A. Cherry[1], Conceptual and Visual Understanding of Hydraulic Head and Groundwater Flow, 2020, The Groundwater Project. [16,000+ book downloads as of May 2025] LINK Guidance Report Hydrogeologic Characterization of Fractured Rock Formations: A Guide for Groundwater Remediators, Sponsored by USDOE, Washington, DC (United States) and Environmental Protection Agency, Washington,

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