Which feature is commonly found in a yard hydrant system?

In a yard hydrant system, having multiple private water sources is a key feature. Such systems are designed to ensure that a reliable and adequate water supply is available for firefighting and irrigation purposes. The presence of multiple private sources allows for redundancy; if one source is compromised or has issues, others can provide the necessary water flow. This is especially important in emergency situations where a consistent and robust supply of water is critical.

The other options do not adequately describe yard hydrant systems. A single water source may not provide sufficient reliability or supply in emergencies. Limiting the system to public water supply only could create risks if there are outages or low pressure situations. Relying solely on electronic control systems minimizes the operational effectiveness in scenarios where mechanical or manual operation may be necessary, particularly in outdoor or uncontrolled environments where power may be unavailable. Thus, having multiple private water sources enhances the functionality and resilience of yard hydrant systems.