For third-party verification of High-Efficiency Irrigation Systems, what must be verified?

In the context of verifying High-Efficiency Irrigation Systems, the verification of a sub-meter and central shut-off is essential for ensuring that the irrigation system operates efficiently and that water usage can be accurately monitored and controlled. The sub-meter allows for tracking the actual water usage of the irrigation system, which is crucial for both managing resources and ensuring compliance with water usage regulations. The central shut-off valve is fundamental for system management, allowing users to turn off the entire system quickly in case of leaks, maintenance, or in response to rain events to avoid overwatering.

By confirming the presence of these components, the verification process not only evaluates the efficiency of the irrigation system but also promotes sustainable water use practices. With an effective monitoring and control system in place, adjustments can be made to improve water efficiency, thereby enhancing the overall performance of the landscape irrigation while reducing waste.

The other options do not primarily address the critical elements of resource monitoring and emergency control that a sub-meter and central shut-off provide. While soil moisture sensors, rainwater harvesting systems, and system pressure regulators play significant roles in irrigation efficiency, the specific focus of this verification relates more closely to system management and usability, which is why the correct response emphasizes the necessity of verifying the sub-meter and