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When selecting a geotextile to be used in a highway design, the design engineer is faced with the task of choosing from hundreds of geotextiles. In order to assist the engineer in the specification of a geotextile, a system to classify and specify geotextiles has been developed for routine applications encountered by the Indiana Department of Highways. These applications include routine filtration/drainage, erosion control, and roadway stabilization applications. A system developed by the French Committee of Geotextiles and Geomembranes has been used as a model. Modifications were made to the system to make it applicable to Indiana Department of Highways projects. For roadway design the new system was combined with the U.S. Forest Service method for the design of temporary roads. This procedure may also be used to determine the amount of stabilization aggregate needed for permanent roads.

Development of an IDOH Classification System for Geotextiles