What is the function of the distribution box in a septic system?

The role of the distribution box in a septic system is crucial for the effective functioning of the entire wastewater management process. Its primary function is to evenly distribute effluent, which is the partially treated wastewater coming from the septic tank, across multiple drainage lines that lead into the drain field. This helps to ensure that the effluent is spread out evenly, promoting optimal absorption into the soil and preventing overloading any single section of the drain field. By achieving an even distribution, the distribution box aids in preventing system failure and ensures efficient treatment of sewage, maintaining the system's functionality and longevity.

The other options do not accurately reflect the purpose of a distribution box. It does not collect rainwater, as this could compromise the septic system’s ability to function effectively. Similarly, it is not designed to store solid waste; that function is managed by the septic tank. Additionally, regulating water pressure is not a role of the distribution box, as the system handles gravity flow rather than pressure-driven flow.