This is how a road culvert works. It is a pipe that crosses transversely from one side of the road to the other. Its function is to drain water coming down the slope and prevent accumulation on the pavement. Water enters through the inlet, flows through the pipe by gravity, and exits on the opposite side. Above the pipe, compacted granular material distributes traffic loads and protects the structure. At the outlet, riprap is placed to dissipate flow energy and prevent erosion. Without a culvert