Under which circumstance is anchoring of underground storage tanks particularly required?

Anchoring of underground storage tanks is particularly required in situations where high water tables exist or site flooding is expected. In these conditions, the buoyant force of groundwater can potentially lift or move the tanks, causing structural damage or even catastrophic failures that result in leaks or spills. Anchoring helps secure the tanks in place, preventing them from being displaced by groundwater movement or flooding, thus ensuring both environmental safety and structural integrity.

In contrast, while anchoring may be relevant in earthquake-prone areas, the specific requirement is more critical in the context of high water tables. Additionally, tanks that are above ground do not typically experience the same buoyancy concerns as those installed underground, and routine maintenance does not inherently necessitate anchoring as the primary focus is often on inspection and repair rather than stabilization.