Texas Wastewater Class B Practice Exam

Brick and mortar were historically used for constructing manholes due to their availability, ease of use, and durability. However, contemporary standards and practices have shifted away from this material for several reasons, such as potential structural weaknesses, difficulty in maintenance, and susceptibility to deterioration over time. Modern approaches favor materials that offer better resistance to corrosion, structural integrity, and overall lifespan.

Concrete remains a common choice for manhole construction today, as it provides the necessary strength and durability required for such infrastructure. PVC is utilized in some applications due to its lightweight and resistant properties, but it is not traditionally used for manhole structures. Steel, while sometimes used, has issues with corrosion unless adequately protected.