Chapter 17.40

Other

• Compost application 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.

  compost at a rate of a minimum of four cubic yards per 1,000 square feet of permeable area shall be incorporated to a depth of six inches into the soil.

• Distance for conifer pruning from structure30 ft

  Retained conifer trees located within 30 feet of a habitable structure shall be pruned to the highest roof deck height, or a maximum of 1/3 of the total tree crown height.

• Drip irrigation efficiency81 pct

  An irrigation system is expected to meet or exceed 75 percent efficiency for overhead spray devices and 81 percent efficiency for drip system devices.

• Evapotranspiration value for Mammoth Lakes33 in

  the evapotranspiration (ETo) value for Mammoth Lakes, which is 33 inches.

• Constant in MAWA calculation0.62 factor

  MAWA equals (0.8) (ETo) (LA) (0.62).

• Factor for existing landscape MAWA0.8 factor

  MAWA equals (0.8) (ETo) (LA) (0.62).

• Flow sensor required for landscape area5,000 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  Irrigation systems for nonresidential landscapes and residential landscapes of 5,000 square feet or larger shall include flow sensors that detect high flow conditions.

• Maximum slope for turf25 pct

  Turf shall not be planted on slopes greater than 25 percent.

• Minimum landscape area for new construction500 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  New construction projects with an aggregate landscape area equal to or greater than 500 square feet.

• Minimum landscape area for rehabilitation2,500 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  Rehabilitation landscape projects with an aggregate landscape area equal to or greater than 2,500 square feet.

• Minimum width of turf areas10 ft

  No portions of turf areas shall be less than ten feet wide to prevent overspray.

• Mulch depth3 in

  A minimum three-inch layer of mulch shall be applied on all exposed soil surfaces of non-turf planting areas.

• Noncombustible area width around structures5 ft

  All landscape projects shall include a noncombustible area at least five-feet-wide that surrounds the base of structures.

• Maximum ETAF for nonresidential0.45 factor

  the evapotranspiration adjustment factor (ETAF) for the landscape project does not exceed a factor of 0.55 for residential areas and 0.45 for nonresidential areas.

• Minimum low water plant percentage for nonresidential Option A100 pct

  One hundred percent of the landscape area shall consist of low to very-low water-use plants (plant factor of 0.3 or less), excluding edibles and areas using recycled water.

• Minimum low water plant percentage for residential Option A75 pct

  At least 75 percent of the landscape area shall consist of low to very-low water-use plants (plant factor of 0.3 or less), excluding edibles and areas using recycled water.

• Maximum high water plant percentage for residential Option A25 pct

  A maximum of 25 percent of the landscape area is permitted to be turf or other high water-use plants (plant factor of 0.7 to 1.0), however the average plant factor for this area shall not exceed 0.6.

• Maximum average plant factor for Option B0.6 factor

  The remaining percentage of the landscape area shall consist of plantings that have an average plant factor of 0.6 or less.

• Minimum low water plant percentage for Option B51 pct

  At least 51 percent of the landscape area consists of low water-use plants (plant factor of 0.3 or less).

• Maximum turf percentage for Option C20 pct

  Turf shall not exceed 20 percent of the total landscape area, or 1,250 square feet, whichever is less.

• Maximum turf area for Option C1,250 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  Turf shall not exceed 20 percent of the total landscape area, or 1,250 square feet, whichever is less.

• Overhead irrigation efficiency75 pct

  An irrigation system is expected to meet or exceed 75 percent efficiency for overhead spray devices and 81 percent efficiency for drip system devices.

• Overhead irrigation setbackSetbackThe distance a building must be held back from a lot line. from non-permeable surface24 in

  Overhead irrigation is prohibited within 24 inches of any non-permeable surface.

• Pressure regulation setting60 psi

  Pressure regulation shall be required on all projects and set to 60 pounds per square inch unless the landscape plan demonstrates a need for higher pressure.

• Maximum ETAF for residential0.55 factor

  the evapotranspiration adjustment factor (ETAF) for the landscape project does not exceed a factor of 0.55 for residential areas and 0.45 for nonresidential areas.

• Distribution uniformity for rotary sprinklers80 pct

  A distribution uniformity (catch can) analysis must achieve a DU of 75 percent or better for spray sprinklers and 80 percent for rotary sprinklers.

• Distribution uniformity for spray sprinklers75 pct

  A distribution uniformity (catch can) analysis must achieve a DU of 75 percent or better for spray sprinklers and 80 percent for rotary sprinklers.

• Horizontal distance between tree crowns10 ft

  At least ten feet of horizontal distance between individual tree crowns shall be maintained for retained conifer trees within 30 feet horizontal distance of a habitable structure.