The process of removing and controlling the access of surface and sub-surface water within the right-of-way of a road is called road drainage.
It also include interception ( collection ) and diversion of water from the road surface and the subgrade.
The process of interception and diversion of surface water through suitable side drains is called surface drainage, and the process of interception and removal of sub-soil water through suitable sub-surface drains is called sub-surface drainage.
The main object of road drainage is to keep the road surface and its foundation as dry as possible so as to maintain its stability.
Thus, a good drainage system is essential for efficient highway transportation with minimum maintenance cost.
It also include interception ( collection ) and diversion of water from the road surface and the subgrade.
The process of interception and diversion of surface water through suitable side drains is called surface drainage, and the process of interception and removal of sub-soil water through suitable sub-surface drains is called sub-surface drainage.
The main object of road drainage is to keep the road surface and its foundation as dry as possible so as to maintain its stability.
Thus, a good drainage system is essential for efficient highway transportation with minimum maintenance cost.
Modes of water penetration into road structure.
The following are the different modes of water penetration into the road structure:-
- Surface water from the top of pavement by percolation through caracks and poor pavement surface.
- surface water from sides of the pavement.
- sub-soil water from underside of the pavement by capillary rise.
- sub-soil water from sides of the pavement.
- Intercepted water due to overflooding of cross drainage works.
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