Which factor can lead to the requirement for anchoring underground storage tanks?

High water tables or expected site flooding can necessitate the anchoring of underground storage tanks to prevent them from floating or being displaced during inundation events. When water levels rise significantly, tanks that are not properly anchored may rise to the surface due to buoyancy forces acting on them, potentially causing damage to the tank itself as well as environmental hazards like spills or leaks. Anchoring tanks ensures that they remain securely in place, safeguarding the integrity of the storage system and reducing the risk of contamination to the environment. This requirement is particularly important in areas where flooding is a known risk, so careful assessment of local site conditions is essential in UST management and compliance.