The Water Efficiency Prerequisite, Outdoor Water Use Reduction requires a reduction over a baseline that...

The Water Efficiency (WE) Prerequisite: Outdoor Water Use Reduction requires projects to reduce landscape water use by at least 30% over a baseline.

The baseline is calculated over the driest three-month period of the year, ensuring that water savings are measured during peak irrigation demand.

Strategies include xeriscaping, high-efficiency irrigation systems, and rainwater collection.

(Source: Official LEED BD+C Reference Manual)