This design note is an outcome of the Cost and Safety Efficient Design for Rural Highways in Developing Countries Project. The project aims to identify safe and cost-effective engineering designs. This note gives technical engineering information on building safe and effective drainage channels alongside roads, and is accompanied by photographs and diagrams. The following design topics are addressed: vee-shaped drains; trapezoidal drains; flat-bottomed drains; parabolic dish drains; covered drains; delineation; and crash amelioration
http://www.transport-links.org/transport_links/filearea/publications/1_809_CaSE%201.pdf.