What is the part of a culvert that is located between the two ends called?

The part of a culvert located between the two ends is referred to as the barrel. The barrel is the main body of the culvert that facilitates the flow of water from one side to the other, typically constructed in a cylindrical or rectangular shape depending on the design and the specific needs of the drainage system. It is essential for conveying water effectively, maintaining proper flow and drainage in roadways or other areas where culverts are installed. Understanding the role of the barrel within the overall structure of a culvert is important for interpreting design plans and ensuring that water management systems function adequately.