Highway Drainage
It is the system of structures and facilities designed to remove and control surface and
subsurface water from the roadway to ensure safe and durable highway performance.
Prevents structural damage to the pavement caused by water accumulation.
Reduces traffic delays and accidents due to hydroplaning and reduced visibility.
Essential for erosion control and maintaining roadway stability.
Sources of Water Affecting Highways:
Surface Water – Rain or snow that flows over or remains on the pavement surface
Ground Water – Water flowing in underground layers that can affect pavement from
below.
Figure 1. Surface Water Vs Groundwater