What is the minimum depth of liquid required in a tank?

The minimum depth of liquid required in a tank is critical for ensuring proper treatment of sewage and preventing issues such as solids accumulation or scum formation that can disrupt the biological processes in the tank. A minimum depth of 30 inches is specified to ensure that there is sufficient volume to allow for effective sedimentation and decomposition of organic materials. This depth helps to maintain the balance necessary for the functioning of the on-site sewage facilities by promoting anaerobic conditions that facilitate the breakdown of waste.

Additionally, this depth reduces the risk of the tank becoming too shallow, which could lead to ineffective treatment and potential overflow or discharge of untreated effluent. Maintaining a depth of 30 inches allows for a buffer against variations in influent flow and solids loading, ensuring the system operates efficiently.