Compute a weighted plant factor (PF) for each landscape type by multiplying the fraction of the area for each landscape type by the PF for that landscape type. Sum the weighted PF values for all landscape type to get a water-efficient plant factor for your entire landscape design. Table 2 – Calculations for weighted plant factor for water-efficient landscape design Fraction of Weighted PF for Area for Plant backyard in each landscape each Landscape Type Factor each type landscape (PF) landscape = PF x fraction type (ft2) type of area Turf grass 0.8 Moderate water use plants 0.6 Low water use plants 0.4 Very low water use plants 0.2 Hardscape 0.0 TOTAL Fill in your weighted PF value in Table 3. Table 3 – Data for irrigation calculations Weighted Plant Factor for Entire Landscape Design = Size of yard = 5400 sq. ft. Irrigation Efficiency = 0.7 Use Table 4 for the following calculations (similar to Step 3 above, but using your new water-efficient weighted plant factor):
Compute a weighted plant factor (PF) for each landscape type by multiplying the fraction of the area for each landscape type by the PF for that landscape type. Sum the weighted PF values for all landscape type to get a water-efficient plant factor for your entire landscape design. Table 2 – Calculations for weighted plant factor for water-efficient landscape design Landscape Type Plant Factor (PF) Area for each landscape type (ft2) Fraction of backyard in each landscape type Weighted PF for each landscape type = PF x fraction of area Turf grass 0.8 Moderate water use plants 0.6 Low water use plants 0.4 Very low water use plants 0.2 Hardscape 0.0 TOTAL Fill in your weighted PF value in Table 3. Table 3 – Data for irrigation calculations Weighted Plant Factor for Entire Landscape Design = Size of yard = 5400 sq. ft. Irrigation Efficiency = 0.7 Use Table 4 for the following calculations (similar to Step 3 above, but using your new water-efficient weighted plant factor):
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