DRAINAGE SYSTEM FOR HILL ROADS IN INDIA

In the planning, design and maintenance of roads, drainage is an important aspect. Inadequate drainage affects the performance of roads in a variety of ways: reduction of pavement and subgrade strength, inundation of road surface, loss of vehicle control, embankment erosion, loss of slope stability and deterioration due to freeze-thaw action in cold regions, etc. While subfreezing temperatures and associated problems are topographically related to high altitude and specific to hill roads, other problems are common to hill roads and roads on the plains. There are requirements that add highly to the significance of drainage in the case of hill roads such as road side drains, catch water drains, cross-drainage works and measures for improving slope stability, etc. For the covering abstract see ITRD E108441.