What is the primary method for restraining tanks in flood-prone areas?

Increasing the burial depth of underground storage tanks (USTs) is essential in flood-prone areas because it helps to anchor the tanks more securely within the earth. When tanks are buried deeper, they are less likely to be lifted or displaced by floodwaters. The hydrostatic pressure from the surrounding soil increases as the burial depth increases, which provides additional resistance against buoyancy forces that could otherwise cause the tank to float in the event of flooding.

By properly increasing the burial depth, the integrity and stability of the UST can be maintained, minimizing the risk of leaks or structural failures that could arise from dislodgement during flood conditions. This practice is crucial for protecting both the environment and public safety, as it reduces the likelihood of hazardous material release.

In contrast, methods such as leveling, decreasing, or diminishing the burial depth do not effectively provide the same level of protection against the forces exerted by flooding and may leave the tanks vulnerable to movement and potential damage.