Open Drains for Roads


1. General Standards and Applications
General, Design Event, Design Considerations, Open Drain Types, Drain Grades, Allowable Velocities, Freeboard, Drain Shap and Side Slopes 
2. Design Procedure
General, Use of Manning's Equation, Manning's Roughness Coefficient, Design Methodology, Special Treatments, Connecting to Existing Drains, Lined Drains, Downstream Protection, Table Drain Blocks/Offshoot Drains, Drop Structures/Check Structures, Procedure for The Design of Drop Structures, Failure Mechanism, Worked Example
3. Construction and Maintenance
Construction, Timing of Construction, Methods of Construction, Control of Erosion During Construction, Maintenance