Frequently Asked Questions
A box culvert is a rectangular or square concrete structure, typically used for larger water flow and where soil pressure is high.
A pipe culvert consists of circular or elliptical pipes, usually made of concrete or metal, and is ideal for smaller drainage applications.
They are commonly used under:
Roads and highways
Railway tracks
Driveways and farm roads
Drainage channels and irrigation systems
These culverts allow water to pass under infrastructure without causing damage or flooding.
Culverts ensure efficient water drainage, prevent flooding or water accumulation, and help maintain the structural integrity of roads and embankments, especially during heavy rains.
Box culverts are usually made of reinforced concrete (RCC).
Pipe culverts can be made of RCC, steel, HDPE, or PVC, depending on load and flow requirements.
The size depends on several factors including:
Expected water flow volume
Topography of the area
Soil conditions
Load from the road or structure above
Engineers use hydrological and structural analysis to select the appropriate culvert type and size.
When properly designed and maintained, both box and pipe culverts can last 50 years or more. Regular inspections and cleaning are important to prevent blockage and structural damage.