Written by HIGHWAY DRAINAGE SYSTEM-ALL YOU NEED TO KNOW
The system which is designed for road for proper collection, removal and disposal of surface as well as sub-surface water is called as road drainage. To maintain the stability and durability of the road, the road surface and its foundation should be kept as dry as possible. This practice is only possible with proper and working road drainage system. Moreover a good drainage of road helps to maintain the highway transportation with minimal cost.
Highway drainage consists of removing or controlling surface water and subsurface water away from the road surface and the subgrade supporting it. Part of the rain water flows on the ground or road surface, while the other part percolates into the ground and reaches the ground water table, raising its level. The subgrade soil above the ground water table may raise through the soil pores due to the phenomenon of capillarity.
The construction of highways and urban roads generally requires the installation of some type of drainage system. It is also observed at the design of highway drainage systems is comparatively simple and the drainage works are relatively inexpensive.
However, highway drainage forms one of the most important operationsin connection with the construction of a road because it depends on the subsequent maintenance of the road.
As far as the highway drainage works are concerned, they may be grouped into four main heads as follows:
- Interception of surface waters which would flow across the road or along with it or would flood it.
- Surface drainage of rain water from the road and its margin.
- Interception of seepage water.
- Under-drainage of the roadbed and its crust…………………
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