Stephen E. Silliman

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Laboratory experiments involving both homogeneous and heterogeneous porous media are used to demonstrate that fluid flow and solute transport will occur regularly in the capillary fringe (CF), including both vertical (upward as well as downward) and horizontal flow velocities. Horizontal flow above the water table appears to be limited primarily to the(More)
Multiple theoretical sampling designs are studied to determine whether sampling designs can be identified that will provide for characterization of ground water quality in rural regions of developing nations. Sampling design in this work includes assessing sampling frequency, analytical methods, length of sampling period, and requirements of sampling(More)
The largest city in Benin, West Africa (Cotonou), is reliant upon groundwater for its public water supply. This groundwater is derived from the Godomey well field which is located approximately 5 Km north of the coast of the Atlantic Ocean and in close proximity to Lake Nokoue—a shallow lake containing water with elevated concentration of chloride and other(More)
1 Stephen Silliman and Pamela Crane, Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, IN 46556, 2 Moussa Boukari, Department des Sciences de la Terre, Universite d’Abomey-Calavi, Cotonou, Bénin , West Africa, Abstract –The University of Notre Dame (UND, USA) and the(More)
Over the past 10 years, the author has experimented with a number of program formats designed to inform engineering undergraduates of the requirements of pursuing engineering projects in developing countries. These have included: (i) an elective course on water supply in developing countries, (ii) a service program in Haiti involving a combination of U.S.(More)
A laboratory tank was used to study entrapment of water in coarse sand lenses above the water table and of air in coarse sand lenses below the water table. Monitoring of these experiments involved a combination of visual inspection, measurement of moisture content, and measurement of air/water pressure. The medium consisted of coarse sand lenses with(More)
We collected seismic data along 15 transects to characterize the geometry of a coastal aquifer in Bénin, West Africa, that is being contaminated by saltwater. We used standard high-resolution seismic methods to image the upper ∼200 m using a sledgehammer source and a 120-channel recording system. Three transects were processed with an iterative updating(More)
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