Question 3010 of 229 · California Water Distribution Operator Exam

What is the main difference between a dry-barrel and a wet-barrel hydrant?

Exactly one answer is correct.

AA dry-barrel hydrant has no main valve and is controlled at the corporation stop
BA wet-barrel hydrant is used only in cold climates
CA wet-barrel hydrant cannot be flushed
DA dry-barrel hydrant keeps its upper barrel empty until the valve opens

Show solution

Correct answer to question 3010

D: A dry-barrel hydrant keeps its upper barrel empty until the valve opens

Explanation

Dry-barrel hydrants have the main valve below the frost line, so the barrel drains after use. Wet-barrel hydrants are used where freezing is rare.