Why is proper drainage important in highway construction?

Proper drainage in highway construction is vital primarily to prevent water accumulation. When water is allowed to accumulate on or near a roadway, it can lead to various issues such as erosion, pavement deterioration, and even the potential for hazardous driving conditions. Standing water can weaken the road structure over time, leading to cracks, potholes, and ultimately increased maintenance and repair costs.

By designing effective drainage systems, water is efficiently channeled away from the road surface and underlying materials, ensuring stability and longevity of the pavement. Additionally, adequate drainage reduces the risk of flooding in adjacent areas, enhances safety for motorists by providing a more stable and predictable driving surface, and extends the life of the highway infrastructure.

While enhancing aesthetic appeal, supporting heavy machinery, and potentially reducing construction costs may be considerations in highway construction, they are secondary to the primary function of drainage, which is to manage water effectively. Proper drainage is essential to ensure the functional integrity and safety of the highway over its expected lifespan.