Highway Engineering

Highway drainage consists of removing or controlling surface water and subsurface water away from the road surface and the subgrade supporting it.

Road drainage is necessary because variation of the moisture content in the soil causes variation in the volume of sub-grade and leads to the failure of the road pavement, excess moisture content in soil sub-grade causes a substantial reduction in its stability, and stability of the soil sub-grade is crucial for road pavement.

The reasons for the necessity of road drainage include variation of the moisture content in the soil causing variation in the volume of sub-grade and leading to the failure of the road pavement, excess moisture content in soil sub-grade causing a substantial reduction in its stability, and stability of the soil sub-grade being crucial for road pavement.

<p>If the stability of the soil sub-grade is not maintained, it can lead to the failure of the road pavement.</p> Signup and view all the answers

<p>Excess moisture content in the soil sub-grade causes a substantial reduction in its stability, which is crucial for road pavement.</p> Signup and view all the answers