What tool is used to measure water depth in a flooded compartment?

• A. Sounding rod and sounding tape.
• B. Ruler and tape measure.
• C. Depth gauge with sonar.
• D. Plumb line and weight.

Answer: (A)

A quick, reliable way to measure water depth in a flooded compartment is by using a sounding rod and sounding tape. You lower the rod into the water until it contacts the bottom, and the markings on the rod (or the attached tape) let you read the depth. The rod provides a direct bottom touch in cramped, turbid spaces, while the tape gives an accurate measurement once you retrieve it. This method is preferred in flooded spaces because it doesn’t rely on electronic gear, works even with poor visibility, and is practical for the short reach typical inside a compartment. The other tools aren’t as well suited: a ruler and tape measure are too short for deeper water; a sonar depth gauge depends on electronics and clear paths, which aren’t reliable in a flooded confined space; a plumb line and weight is slower and less convenient for quick checks.