What is a key element of sprinkler compliance under prescriptive landscape requirements?

The requirement for spray and rotor systems to achieve a 65% Distribution Uniformity (DU) is crucial for sprinkler compliance under prescriptive landscape regulations. Distribution Uniformity refers to how evenly water is distributed across a landscape area. A minimum of 65% DU ensures that water is applied uniformly, reducing oversaturation in some areas while ensuring others receive adequate moisture. This not only improves irrigation efficiency but also promotes healthier plant growth and conserves water resources.

This standard is particularly important in California, where water conservation measures are stringent due to climate conditions and regulatory frameworks aimed at sustainable landscape practices. Meeting this standard helps mitigate wastage and ensures compliance with state regulations that prioritize efficient water use.

In contrast, the other possible choices do not encompass the primary regulatory focus of sprinkler compliance. Manual operation is not a standard requirement, checking for leaks is not mandated on a weekly basis, and there are circumstances where installation by licensed professionals may not be a strict requirement depending on project scale or local regulations. Thus, the emphasis on achieving a specified Distribution Uniformity is integral to meeting prescriptive irrigation standards.