What is the minimum height that shore potable water hoses should be above deck?

The minimum height that shore potable water hoses should be above deck is specified as 18 inches to prevent contamination. By maintaining this height, it ensures that any potential contaminants on the deck, such as debris, oil, or other substances, do not have the chance to enter the potable water system. The 18-inch elevation acts as a safeguard against backflow and helps maintain the quality and safety of drinking water for onboard use. This standard is in line with best practices for water safety and contamination prevention in maritime operations. The other options suggest greater heights but do not align with the established minimum requirement, making 18 inches the correct and appropriate answer.