Which of the following is NOT a culvert shape?

The correct answer is that V-shaped is not a commonly recognized culvert shape. Culverts are typically designed to facilitate the passage of water under roads, railways, or other structures and are generally constructed in shapes that can effectively manage flow and stability. Common designs include round, box-like, and even elliptical shapes due to their properties of strength and hydraulic efficiency.

Round culverts are often used because their shape allows for uniform flow and they distribute loads evenly. Box-like culverts are rectangular, providing ample space for water flow and accommodating various installation scenarios. Pear-shaped culverts, while less common, can be found in specific applications requiring a modified shape to enhance performance based on local environmental conditions.

In contrast, V-shaped culverts are not standard due to their potential inefficacy in managing water flow compared to the traditional shapes. The narrow apex would not provide the necessary space for water to flow freely, nor would it offer the structural integrity required to withstand traffic loads and earth pressure as effectively as other shapes do. Therefore, V-shaped does not fit into the conventional categorization of culvert shapes.