Which of the following best describes an overflow device in drainage systems?

An overflow device in drainage systems is primarily designed to act as a preventive measure against flooding. When the primary drainage system becomes overwhelmed—whether due to heavy rainfall or blockages—the overflow device allows excess water to escape in a controlled manner. This helps to prevent water from backing up and flooding both the drainage system and the surrounding areas.

Overflow devices play a crucial role in maintaining the integrity of the drainage system by ensuring that it can accommodate excess flow without causing structural damage or health hazards associated with water accumulation. Understanding this function is essential for effective drainage management and ensures that systems remain functional during peak flow conditions.

In contrast to other choices, sealing leaks refers to repairs rather than a function of managing overflow, and indicators for maintenance needs or connectors between pipes do not encapsulate the primary role of overflow devices, which is specifically focused on flood prevention.