What must a water-efficient landscape irrigation system exceed according to CALGreen?

A water-efficient landscape irrigation system must exceed the initial requirements for plant installation according to CALGreen standards. This regulation is designed to encourage the use of irrigation systems that not only meet the basic needs of newly installed plants but also enhance water conservation efforts beyond what is typically mandated at the time of installation.

The focus is on creating landscapes that are resilient and sustainable by integrating advanced irrigation technologies and practices that promote efficient water use. This includes considerations like using drip irrigation, drought-tolerant plants, and advanced scheduling systems that adjust according to weather and soil moisture conditions. By exceeding the basic requirements, the landscape can better adapt to environmental changes and local climate conditions, ultimately leading to a more responsible use of water resources.

In contrast, aspects like natural rainfall averages, estimated landscape area, and local drought conditions, while important for understanding the broader context of water use, do not directly relate to the specific guidelines outlined in CALGreen for irrigation systems. These elements may influence planning and designing, but they are not the defining metrics that CALGreen stipulates for water-efficient irrigation beyond the established standards for plant installation.