Why should you use tie-down straps or deadman anchors when installing a UST in an area with a high water table?

• A. To prevent buoyancy and float-out
• B. To improve loading capacity
• C. To speed up installation
• D. To reduce corrosion

Answer: (A)

High water tables create buoyant uplift on an underground tank because the surrounding saturated soil is effectively lighter, so the tank experiences an upward force from displaced water. If unrestrained, that buoyant force can lift the tank and potentially cause leaks or damage at the fittings. Tie-down straps and deadman anchors provide restraint to counter that lift: straps secure the tank to stable anchors and resist upward and lateral movement, while deadman anchors are buried supports connected to the tank to absorb the buoyant force. This specific restraint prevents float-out and keeps the UST firmly in place. They don’t increase load capacity, speed up installation, or reduce corrosion, so those aspects aren’t addressed by using these restraints.