What is the minimum drop in elevation required from the outlet of the tank to the absorption area?

The minimum drop in elevation required from the outlet of the tank to the absorption area is 12 inches. This requirement is established to ensure proper gravity flow of effluent from the septic tank to the absorption area. Adequate elevation drop is essential for preventing backflow and ensuring optimal distribution of effluent throughout the absorption field, which in turn helps maintain the effectiveness of the wastewater treatment process.

If the elevation drop is insufficient, it can lead to pooling or inadequate drainage of effluent, potentially causing failures in the system, such as the absorption area becoming saturated and unable to treat wastewater effectively. Furthermore, ensuring that there is a sufficient drop helps to maintain the desired hydraulic gradient necessary for the system to function correctly, promoting effective soil water interactions and filtering of contaminants.

By adhering to the 12-inch requirement, installers support the longevity and reliability of the OSSF system, ensuring it operates as intended and complies with regulatory standards.