The irrigation water demand of a green roof (or any landscape) depends on many factors such as the local evapotranspiration rate, its area and the irrigation efficiency, as well as the plant species, the planting density, and the microclimate according to Equation 14: WR = (Eto*Kₛ*Kᴅ*Kₘ꜀-Re)*A/IE Equation 1⁴ Where WR = Water requirement/demand (L/month) ETₒ = Local reference evapotranspiration (mm/month) Kₛ = Species factor (dimensionless) Kᴅ = Density factor (dimensionless) Kₘ꜀ =...