If water ballast is used, what should its level in the tank not do?

When using water ballast in a tank, ensuring proper levels is crucial for maintaining stability and safety during operations. The water ballast cannot exceed the water level in the hole (the surrounding environment of the tank) because doing so could result in potential overflow or spillage. This could compromise both the integrity of the tank and the surrounding environment, increasing the risk of accidents, environmental contamination, and regulatory violations.

Maintaining the water ballast level at or below the water level in the hole allows for proper hydrostatic balance, preventing overpressure situations. The use of water ballast is intended to enhance stability without creating conditions that could lead to issues like hydraulic failure or the risk of structural damage to the tank. Hence, keeping the water ballast from exceeding the hole's water level is a critical operational guideline in the management of tank systems.