Table of Contents

2.3.1 Surface Drainage

Slope/crossfall, elevation, catch drains and table drains provide primary surface drainage. The easiest and most used technique is elevation and cross-fall – lifting the pavement from its surrounds in conjunction with sloping its surface to remove any rainfall by the quickest path has been the basis of surface drainage for thousands of years.

Figure 2.5: Schematic of surface drainage

Source: VicRoads (2004a)

Current surface drainage practices are well documented in road design procedures and are not addressed in this document. Design of surface drains is discussed in the Guide to Road Design – Part 5: Road Drainage (Austroads 2008b) and construction of surface drains is discussed in the Guide to Pavement Technology – Part 8: Pavement Construction (Austroads 2009c).