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Of the available functions that geosynthetic materials possess, their ability to conduct liquids in the plane of their structure is important in a wide class of drainage applications. The thicker geotextiles (usually needled nonwoven types) and a new generation of high drainage composite materials are most suitable for this purpose.
This design-oriented paper gives the necessary theory and required test data and then proceeds to solve three numeric examples illustrating the procedures. They are slope drainage, consolidating foundation drainage, and drainage behind a retaining wall.
geotextiles, geocomposites, geosynthetics, design, drainage, transmissivity, flow rate, planar flow
Professor of Civil Engineering, Drexel University, Philadelphia, PA
Project engineer, Soil and Material Engineers, Inc., Fairfield, OH