Classification of a seep?

• A. Class A (1/8-1/4)
• B. Class C (3/4-1)
• C. Class D (1-2)
• D. Class B (1/4-3/4)

Answer: (D)

Seepage is categorized by how large the leakage is relative to a reference value, using four severity bands. The middle band, spanning from 1/4 to 3/4 of the reference, represents a moderate level—not a negligible trace, but not a heavy leak either. That is what Class B denotes, so a seepage amount in that range is classified as Class B. If the seepage were smaller, it would fall into the lighter category; if larger, it would move into a higher-severity category. Therefore, the classification is Class B (1/4-3/4).