Georgia Septic Installer Practice Test

The correct answer is based on standard septic system design practices that ensure proper flow and functioning of the distribution box. The positioning of the invert of the inlet hole above the invert of the outlet is critical for facilitating efficient wastewater movement through the system. By maintaining a height difference of 3 inches, it allows wastewater from the inlet to flow by gravity into the distribution system, helping to prevent blockages and ensuring even distribution of effluent to the drain field.

This height difference is essential because it provides adequate head pressure that encourages the efficient movement of effluent while also preventing potential issues such as flooding or backflow that can occur if the inlet is positioned too close to the outlet. Overall, this measurement is a key factor in maintaining the effectiveness and longevity of the septic system.