Why is drainage important in highway construction?

Drainage is a critical aspect of highway construction, primarily because it prevents water accumulation that can damage infrastructure. Inadequate drainage can lead to a host of problems, including soil erosion, pavement deterioration, and the weakening of subgrade materials. Water pooling on or beneath the pavement can create a situation where the structural integrity of the road is compromised. This can result in issues such as cracking, potholes, and even structural failure over time.

Effective drainage systems are designed to manage surface and subsurface water effectively, ensuring that water is directed away from the roadway and its supporting structures. This not only prolongs the lifespan of the highway but also enhances its safety by reducing the likelihood of hydroplaning and other water-related hazards.

While aesthetics, cost reduction, and construction speed are important considerations in highway construction, they are secondary to the crucial role of drainage in maintaining the integrity and safety of the roadway. Proper drainage systems are essential for ensuring that the overall infrastructure remains durable and functional over its intended lifespan.