What is the maximum amount of water allowed to accumulate in an occupied trench?

What is the maximum amount of water allowed to accumulate in an occupied trench?

• A. 1
• B. 2
• C. 0
• D. 3

Answer: (C)

Water in an occupied trench is a serious hazard. The requirement is that no water should accumulate while workers are inside. Why this matters: water adds hydrostatic pressure to the trench walls and can seep through soil, reducing its strength. That combination makes a cave‑in more likely and can trap or drown workers if they’re down in the trench. So the safest standard is to keep the trench free of water, and any seepage or rainwater must be pumped out and controlled before anyone remains in the trench. In practice, you’d dewater the trench, fix drainage to prevent new water from accumulating, and ensure shoring or trench boxes are properly installed and exit routes remain accessible. If water can’t be controlled safely, work in the trench should not continue. Any nonzero amount of water is not acceptable in an occupied trench, so the maximum allowed is zero.

Water in an occupied trench is a serious hazard. The requirement is that no water should accumulate while workers are inside. Why this matters: water adds hydrostatic pressure to the trench walls and can seep through soil, reducing its strength. That combination makes a cave‑in more likely and can trap or drown workers if they’re down in the trench. So the safest standard is to keep the trench free of water, and any seepage or rainwater must be pumped out and controlled before anyone remains in the trench.

In practice, you’d dewater the trench, fix drainage to prevent new water from accumulating, and ensure shoring or trench boxes are properly installed and exit routes remain accessible. If water can’t be controlled safely, work in the trench should not continue.

Any nonzero amount of water is not acceptable in an occupied trench, so the maximum allowed is zero.