The DEEP DRILLER departs a fresh water port at a draft of 20.5 feet. What will be the draft in sea water?

Correct Answer: Option C — 19.7 feet

Draft changes between fresh and salt water are determined using the fresh water allowance (FWA). Applying Archimedes' principle and density differences between fresh water (1.000) and sea water (1.025) converts the 20.5-foot fresh water draft to a salt water draft of 19.7 feet.