Texas Wastewater Class B Practice Exam

What are factors that can contribute to infiltration in a collection system?

1. Breaks in the main lines

2. High ground water levels

3. Heavy rains

4. All of the above

The correct answer is: All of the above

The correct choice indicates that all listed factors can contribute to infiltration in a collection system. Each of these factors plays a crucial role in introducing extraneous water into wastewater collection systems. Breaks in the main lines can create openings that allow groundwater or surface water to seep into the collection system, increasing the overall flow and potentially overwhelming the system. High groundwater levels can also significantly contribute to infiltration. When the water table rises, it exerts pressure on the collection system, which can lead to water entering through joints, cracks, or other weaknesses in the infrastructure. Heavy rains can saturate the ground, leading to surface runoff that can infiltrate the collection system, particularly in areas where the infrastructure is older or not properly sealed. Together, these factors illustrate the various environmental and physical conditions that can lead to increased infiltration, which is essential for understanding and managing wastewater collection systems effectively.