Depth Of Cover

Depth of cover refers to the layer of material placed above an underground storage tank to protect it once installation is complete. This measurement starts at the top of the tank and extends up to the finished ground or pavement surface.

Maintaining the correct depth is critical for both structural stability and long-term safety, especially in areas exposed to traffic loads or heavy equipment.

Why Depth of Cover Matters

Proper coverage helps distribute surface loads evenly, reducing stress on the tank below. It also plays a role in preventing tank movement, collapse, or damage over time.

Anchoring systems are often used during installation to ensure the tank remains securely positioned while backfill and paving materials are added above it.

Materials Used Above Underground Tanks

The protective layer above a tank typically consists of engineered backfill materials designed to provide both strength and drainage. Commonly used materials include:

• Sand
• Crushed stone
• Approved backfill blends specified by engineering standards

These materials help stabilize the surrounding soil while allowing moisture to drain away from the tank structure.

Installation and Measurement Considerations

The required thickness of cover depends on several factors, such as:

• Tank size and design
• Expected surface load (vehicle traffic or equipment)
• Local codes and engineering specifications

Installers measure coverage carefully during construction to ensure compliance with safety and regulatory requirements.

Long-Term Protection and Compliance

Once installed correctly, the containment backfill above the tank acts as a protective buffer throughout the tank’s service life. Insufficient or uneven coverage can lead to premature wear, structural failure, or non-compliance during inspections.