The objective of this research was to develop guidelines to enable designers to consider the effect of subsurface drainage on pavement performance. Specifically, the project investigated the effects of subsurface drainage of surface-infiltration water on the performance of portland cement concrete (PCC), hot-mix asphalt (HMA), and composite pavements; permeable bases and associated edge drains; traditional dense-graded bases with and without edge drains; and retrofit subsurface drainage.
