Partially Irrigated Site / Form

Hi Johanna, If a species does not require irrigation once it is established, then the effective ks = 0 and the resulting KL = 0. Therefore, the total landscape area must be the same in the baseline and design cases, but the irrigated area does not have to be identical. However, note that natural/undisturbed vegetation should be excluded from the calculations.

Should natural/undisturbed vegetation within the LEED project boundary be included in the calculations? In the definitions section for this credit, the LEED 2009 NC reference guide page 191 has the following definition: "The landscaped area of the site is the total site area less the building footprint, paved surfaces, water bodies and patios." I don't I understand why natural and undisturbed vegetation should be excluded from the landscaped area calculations. We have a project with a similar condition; an irrigated living roof, irrigated grape vines and irrigation native landscaping, and protected area without irrigation.