Georgia Septic Installer Practice Test

How many inches shall the invert of the inlet hole be above the invert of the outlet hole for a concrete distribution box?

1. 1 inch

2. 2-3 inches

3. 3-4 inches

4. 4-5 inches

The correct answer is: 2-3 inches

The correct answer indicates that the invert of the inlet hole should be positioned 2 to 3 inches above the invert of the outlet hole in a concrete distribution box. This design specification is critical for ensuring proper flow and function of the septic system. By maintaining this height difference, gravity aids in directing effluent from the inlet to the outlet, preventing backflow or pressure build-up within the box. If the inlet were too close to the outlet, it could lead to inadequate drainage, causing potential clogs and system failure. Additionally, this elevation helps accommodate variations in soil saturation and prevents pooling that could occur if the system were not properly configured. Grade specifications like these are essential for the effective operation and longevity of septic systems, providing a balance between efficient liquid movement and minimizing the risk of failure. Understanding these parameters is crucial for anyone involved in septic system installation and management.