Presentation by Gabriel Eckstein (environmental attorney and president of the International Water Resources Association) to the 46th IAH Congress, September 2019. He presents the fundamentals and governance challenges associated with sharing groundwater resources across state boundaries, including between nations, and conceptual models of various transboundary aquifers are included in the presentation.

This video is a field demonstration of groundwater sampling using the low flow method. It shows all the details of pump placement, drawdown control and measurements, flow cell programing, achieving the optimum pumping flow rate for steady-state pumping and drawdown, stabilization of field indicator parameters and sample collection.

The Story of Cave Development. How do caves and their decorations come into existence? Caves are formed and decorated by water - the tunnels, chambers, shafts and finely sculptured walls have all been carved out by flowing water. Stalactites, stalagmites, curtains, frozen waterfalls, rimstone dams and, the most remarkable all of cave formations - helictites have all be created by nothing more than water laden with minerals. This video explains how.

This realistic animation very effectively illustrates the nature and original of flow in karst terrain, including the dissolution process, flow along fractures, and disappearing streams, for example.

Presentation by Ashok Gadgil of UC Berkeley and Lawrence Berkeley National Lab, March 2021, discussing technologies to remove arsenic from drinking water.

This video illustrates (via animation) how freshwater aquifers are present beneath the ocean floor, and how these offshore supplies can be tapped for agricultural use and urban water supply. It also illustrates how the use of offshore aquifers to enhance oil extraction can affect groundwater supplies onshore and potentially lead to land subsidence.