A fire hydrant that has water in vertical portion (barrel) of the hydrant all of the time is a ______ barrel hydrant.

• A. Dry
• B. Wet
• C. Partial
• D. Isolated

Answer: (B)

Water is kept in the vertical barrel part of the hydrant at all times, which identifies it as a wet-barrel hydrant. This design means the hydrant is ready to deliver water immediately when a valve is opened, since the water is already in the barrel right at the outlets. In contrast, a dry-barrel hydrant has an empty barrel and only fills with water after the hydrant is opened (water comes from the main into the barrel), a setup used in freezing climates to prevent the barrel from freezing. The other terms aren’t standard classifications for hydrant types and don’t describe the water being present in the barrel at all times.