20/09/2026
Functions of Drainage Culvert
A drainage culvert is a structure that allows water to safely pass underneath a road or embankment.
1. Controls Water Percolation
It helps control the movement of water through the soil and reduces unwanted seepage around the road structure.
2. Prevents Soil Erosion
The culvert safely carries runoff water to the outlet, reducing soil erosion and slope failure near the road.
3. Protects the Road Structure
Proper drainage prevents water from weakening the road foundation and helps maintain the stability of the embankment.
4. Outlet Protection
The outlet area is protected with concrete or stone pitching so that flowing water does not wash away the surrounding soil.
In short: A drainage culvert safely transfers water beneath a road while protecting the road embankment and surrounding soil.