What is the function of weep holes in a dry barrel fire hydrant?

Weep holes in a dry barrel fire hydrant serve a critical function by allowing any water that may have accumulated in the hydrant barrel to drain out when the hydrant is not in use. This drainage is essential in preventing water from freezing inside the barrel during colder weather, which could cause damage to the hydrant and make it inoperable when needed. By ensuring that the water can escape, the weep holes help maintain the integrity of the hydrant and ensure it remains functional when required for emergencies.

This design is especially important because dry barrel hydrants are typically used in areas that experience freezing temperatures. When the hydrant is shut off, the weep holes mitigate the risk of ice formation by allowing the remaining water to flow away, thus preserving the fire hydrant's usability and reliability.