Definitions. The following terms as used in this section shall have the following meanings:
Backflow prevention device.An approved device installed to City standards that will prevent backflow or back-siphonage into the City's potable water system.
Booster pump.A pump used where the normal water system pressure is low and needs to be increased.
Check valve.A valve located under a sprinkler head or other location in the irrigation system to hold water in the system to prevent drainage from sprinkler heads when the sprinkler is off.
Compost.The decayed remains of organic matter that has rotted into a natural fertilizer.
Effective precipitation.The portion of total precipitation that becomes available for plant growth and that is used by the plants.
Emitter.A drip irrigation fittings emission device that delivers water slowly from the system to the soil.
Estimated total water use.The total irrigation water projected to be used for a project's irrigated landscape area in gallons per day. The estimated total water use shall not exceed the project's maximum applied water allowance.
Evapotranspiration (ET) adjustment factor.A factor of 0.7 that, when applied to reference evapotranspiration, adjusts for plant factors and irrigation efficiency, two major influences upon the amount of water that needs to be applied to the landscape.
Evapotranspiration rate.The quantity of water evaporated from adjacent soil and other surfaces and transpired by plants during a specific specified time.
Flow rate.The rate at which water flows through pipes, valves and emission devices, measured in gallons per minute, gallons per hour, or cubic feet per second.
Hardscapes.Any durable material (pervious and non-pervious).
High-water-use plants.Turf, annuals, container plantings, and other plants recognized as high-water-use by the California Department of Water Resources 2000 publication, Water Use Classification of Landscape Species (WUCOLS), as it currently exists or may be amended in the future.
Hydrozone.A portion of the landscaped area having plants with similar water needs that are served by a valve or set of valves with the same schedule.
Hydrozone table.A table that identifies each hydrozone, the plant types in the hydrozone, the plant factor from the California Department of Water Resources 2000 publication, Water Use Classification of Landscape Species (WUCOLS), and the area in square feet that is included in the hydrozone.
Infiltration rate.The rate of water entry into the soil expressed as a depth of water per unit of time (e.g., inches per hour).
Invasive plant species.Species of plants not historically found in California and/or that spread outside cultivated areas and can damage environmental or economic resources as determined by the California Invasive Plant Council.
Irrigation efficiency (IE).The measurement of the amount of water beneficially used divided by the amount of water applied. Irrigation efficiency is derived from measurements and estimates of irrigation system characteristics and management practices. The minimum average irrigation efficiency for purposes of the water-efficient landscape requirements is 0.75 for overhead irrigation and 0.81 for drip irrigation.
Irrigation meter.A separate meter that measures the amount of water used for items such as lawns, washing exterior surfaces, washing vehicles, filling pools, etc.
Landscaped area.The entire parcel less the building footprint, driveways, and nonirrigated portions of parking lots, hardscapes such as decks and patios, and other nonporous areas. Water features are included in the calculation of the landscaped area. Areas dedicated to edible plants, such as orchards or vegetable gardens, are not included. The landscaped area does not include footprints of buildings or structures, sidewalks, driveways, parking lots, decks, patios, gravel or stone walks, other pervious or impervious hardscapes, and other non-irrigated areas designated for nondevelopment (e.g., open spaces and existing native vegetation).
Low-water-use plants."Mediterranean region" and native trees, shrubs and groundcovers such as rosemary, juniper, most native oaks, and other plants recognized as low-water-use by the California Department of Water Resources 2000 publication, Water Use Classification of Landscape Species (WUCOLS), as it currently exists or may be amended in the future.
Maximum applied water allowance (MAWA).The upper limit of the annual applied water allowed for a project's established landscaping, based upon the city's reference evapotranspiration, the evapotranspiration (ET) adjustment factor and the size of the landscaped area.
Microclimate.The climate of a small, specific area that may contrast with the climate of the overall landscaped area due to factors such as wind, sun exposure, plant density or proximity to reflective surfaces.
Mined land reclamation projects.Any surface mining operation with a reclamation plan approved in accordance with the Surface Mining and Reclamation Act of 1975.
Moderate-water-use plants.Ornamental trees, shrubs, ground covers, and perennials and other plants recognized as moderate-water-use by the Water Use Classification of Landscape Species document, as it currently exists or may be amended in the future.
Mulch.Any organic material such as leaves, bark, straw, compost or other inorganic mineral materials such as rocks, gravel, and decomposed granite left loose and applied to the soil surface for the beneficial purposes of reducing evaporation, suppressing weeds, moderating soil temperature and preventing soil erosion.
Overhead irrigation.Those systems that deliver water through the air (e.g., pop-ups, impulse sprinklers, spray heads, rotors, micro-sprays).
Overspray.The irrigation water which is delivered beyond the landscaped target area, wetting pavements, walks, structures, or other non-landscaped areas.
Pervious.Any surface or material that allows the passage of water through the material and into the underlying soil.
Plant factor.A factor that, when multiplied by the reference evapotranspiration (ETo), estimates the amount of water used by needed plants. Plant factors are derived from the Department of Water Resources 2000 publication, Water Use Classification of Landscape Species.
Point source irrigation.Any non-spray low volume irrigation system utilizing emission devices with a flow rate measured in gallons per hour. Low volume irrigation systems are specifically designed to apply small volumes of water slowly at or near the root zone of plants.
Rain sensor.A system component that automatically shuts off and suspends the irrigation system when it rains.
Recycled water.Tertiary treated water that results from the treatment of wastewater is suitable for direct beneficial use, and conforms to the definition of disinfected tertiary recycled water in accordance with state law.
Reference evapotranspiration (ETo).A standard measurement of environmental parameters that affect the water use of plants and is an estimate of the evapotranspiration of a large field of four- to seven-inch tall, cool-season grass that is well watered.
Runoff.Water which is not absorbed by the soil or landscape to which it is applied and flows from the landscape area.
Soils laboratory report.The analysis of a soil sample to determine nutrient content, composition and other characteristics, including contaminants.
Sprinkler head.A device that delivers water to the landscape through a spray nozzle.
Station.An area served by one valve or by a set of valves that operate simultaneously.
Submeter.A separate meter that is located on the private side of the water system and is plumbed to measure only the water that flows through the irrigation system. This meter is to be used by the property owner to monitor irrigation water use and will not be read by the City.
Swing joint.An irrigation component that provides a flexible, leak-free connection between the emission device and the lateral pipeline to allow movement in any direction and to prevent equipment damage.
Valve.A device used to control the flow of water in the irrigation system.
Valve manifold.A one-piece manifold for use in a sprinkler valve assembly that includes an intake pipe having a water inlet and a plurality of ports adapted for fluid connection to inlets.
Water feature.A design element where open water performs an aesthetic or recreational function. Water features include ponds, lakes, waterfalls, fountains, artificial streams, spas and swimming pools (where water is artificially supplied). The surface area of water features is included in the high-water-use hydrozone of the landscape area.