21.56.040

Other

• Compost incorporation rate4 cubic yardscubic yard (cy)A unit of earth volume used in grading limits — roughly one dump-truck scoop. per 1000 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  Incorporate compost at a rate of at least four cubic yards per one thousand square feet to a depth of six inches

• Maximum evapotranspiration adjustment factor for nonresidential0.45 ratio

  and 0.45 for nonresidential projects.

• Maximum evapotranspiration adjustment factor for residential0.55 ratio

  The evapotranspiration adjustment factor (ETAF) calculated in the Water Efficient Landscape Worksheet shall not exceed 0.55 for residential projects

• Minimum irrigation efficiency for drip systems81 pct

  and eighty-one percent for drip systems.

• Minimum irrigation efficiency for overhead spray75 pct

  Irrigation systems shall be designed and constructed to achieve a minimum efficiency of seventy-five percent for overhead spray devices

• Minimum mulch depth3 inches

  Apply a minimum three-inch layer of mulch on all exposed soil surface of planting areas.

• Prohibit overhead spray within 24 inches of non-permeable surfaces24 inches

  Prohibit overhead spray irrigation within twenty-four inches of non-permeable surfaces

• Prohibit turf on slopes greater than 20% adjacent to hardscape20 pct

  Prohibit turf on slopes greater than twenty percent where the toe of the slope is adjacent to an impermeable hardscape.