What is the requirement for the wall separating two compartments in a septic tank?

The requirement for the wall separating two compartments in a septic tank being tight fitting ensures that there is an effective separation between the two compartments. This design plays a critical role in the functionality of the septic system. It helps to maintain two distinct environments within the tank, allowing for the proper flow of wastewater from one compartment to another without mixing the contents. This separation is crucial to allow for adequate treatment of the waste, as each compartment often serves a different purpose in the treatment process.

A tight-fitting wall prevents the escape of gases and liquids between the compartments, which is important for system efficiency and safety. It also aids in preventing short-circuiting, where wastewater could bypass treatment due to improper flows. Overall, a tight fit maximizes treatment efficiency and prolongs the life of the septic system, making it a key requirement in septic tank design and construction.