If the maximum leg penetration of the COASTAL DRILLER is 75 feet, the water depth value in the Allowable Wind and Wave Charts must be increased by __________.

Correct Answer: Option B — 50 feet

Jack-up stability calculations require adjusting water depth values by adding specific leg penetration allowances from the MODU's Operating Manual and stability booklet. This ensures wind and wave overturning moments correctly account for the elevated hull's effective height above the seabed interface.