Which of the following factors is NOT a consideration for septic tank design?

In the context of septic tank design, the factors that play a critical role are those directly related to the performance, safety, and longevity of the system. The strength of materials used is crucial as it ensures the tank can withstand the stresses imposed by the surrounding soil and any loads above it. Compartmentalization is significant for efficient treatment of waste, allowing for better separation of solids and liquids, thus improving the overall function of the septic system. Load-bearing capacity is essential to ensure the tank can support the weight of the soil and any structures placed above it without collapsing.

Tank color, on the other hand, does not have any direct impact on the performance or functionality of the septic tank. While color may be relevant for aesthetic reasons or heat absorption in certain contexts, it does not influence aspects such as structural integrity or waste treatment efficiency. Therefore, it is not a design consideration that affects the effectiveness or safety of septic systems.