What containment capacity is typically designed for above-ground tanks?

• A. 100-110% of tank capacity
• B. 50-60% of tank capacity
• C. 120-150% of tank capacity
• D. 0% of tank capacity

Answer: (A)

Containment for above-ground tanks is designed to hold the tank’s full contents plus any incidental liquid that could accumulate in the area, like rainwater. Because you need space for both the largest tank and potential precipitation or small spills, the typical design target is a containment capacity of about 100-110% of the largest tank’s capacity. This extra 10% provides room for drainage and weather-related runoff without overflow. Options that are only 50-60% are too small to contain the full tank contents, while 0% is impractical, and 120-150% is more than necessary for typical designs and isn’t the standard expectation in most guidelines.