This synthesis report describes the current state of the practice for the maintenance of highway edgedrain systems (i.e., outlet, headwall, connection, longitudinal/mainline pipe) and procedures to reduce and facilitate the maintenance of edgedrains. Information is provided on the maintenance of edgedrains, its relation to pavement drainage and performance, and the importance and cost benefits of providing good drainage in highways. Information for the synthesis was collected by surveying U.S. and Canadian transportation agencies and by conducting a literature search to document North American and European practices. This report of the Transportation Research Board is an extension to the information provided by NCHRP Synthesis of Highway Practice No. 239, "Pavement Subsurface Drainage Systems" (1997). Design, material, and construction details and techniques, obtained from a survey of North American transportation agencies, are provided to demonstrate effective edgedrain maintenance practices that promote highway drainage. Agency policies and procedures for edgedrain maintenance are also provided. In addition, strategies to reduce edgedrain maintenance costs and methods of increasing maintenance effectiveness are included. (A)
Samenvatting