INVESTIGATION OF ROADWAY DRAINAGE AS RELATED TO THE PERFORMANCE OF FLEXIBLE PAVEMENTS

The primary objectives of this study are to evaluate current practices and to investigate various alternatives for providing subsurface drainage facilities for highways in South Carolina. To this end, a survey of current design and construction practices and field investigations of subsurface drainage facilities for highways with flexible pavements were conducted. Presented in this report are the findings from this study as well as the discussions and recommendations in regard to the planning, design, construction, and maintenance of subsurface drainage systems. Specifically, the topics concerning pavement transverse subsurface drainage, the interception of longitudinal flow of water below the pavement surface, ground water control, and filter materials are included in this report.