In an occupied trench, how much water may accumulate?

• A. 0
• B. 1
• C. 2
• D. 3

Answer: (A)

Keeping an occupied trench dry is essential because water weakens the soil and increases the risk of a cave-in while people are inside. Saturated soil loses strength, hydrostatic pressure pushes on the walls, and standing water creates slippery surfaces and potential drowning hazards if a collapse occurs. To protect workers, any accumulating water must be pumped out and drainage controlled, so no water is allowed to collect in an occupied trench.