Dye Tracing
- http://www.dyetracing.com/dyetracing/dyetrace.html
- Explains the process of using dyes for cave tracing, finding groundwater contaminants, wellhead protection programs, tracking sewer leaks and mapping pipelines. Provides information about the technique, and case histories.
Henry Darcy and His Law
- http://biosystems.okstate.edu/darcy/
- About Henri Darcy and his contributions to understanding flow in porous media. Includes biography, discussions of basic concepts and the Darcy-Weisbach equation, and a lab procedure for falling-head permeability tests.