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"Evapotranspiration rate" means the quantity of water evaporated from adjacent soil and other <br /> surfaces and transpired by plants during a specified time. <br /> "Flow rate" means the rate at which water flows through pipes, valves and emission devices, <br /> measured in gallons per minute, gallons per hour, or cubic feet per second. <br /> "Hardscapes" means any durable material or feature (pervious and non pervious) installed in or <br /> around a landscaped area, such as pavements or walls. Pools and other water features are <br /> considered part of the landscaped area and not considered hardscapes for purposes of these <br /> Standards. <br /> "Hydrozone" means a portion of the landscaped area having plants with similar water needs and <br /> typically irrigated by one valve/controller station. A hydrozone may be irrigated or non- <br /> irrigated. <br /> "Infiltration rate" means the rate of water entry into the soil expressed as a depth of water per <br /> unit of time (e.g., inches per hour). <br /> "Invasive plants species" or "noxious" means species of plants not historically found in <br /> California that spread outside cultivated areas and can damage environmental or economic <br /> resources. Invasive plant species may be regulated by county agricultural agencies as noxious <br /> species. <br /> "Irrigation audit" means an in-depth evaluation of the performance of an irrigation system <br /> conducted by a Certified Landscape Irrigation Auditor. An irrigation audit includes, but is not <br /> limited to: inspection, system tune-up, system test with distribution uniformity or emission <br /> uniformity, reporting overspray or runoff that causes overland flow, and preparation of an <br /> irrigation schedule. <br /> "Irrigation Management Efficiency " or "IME" means the measurement used to calculate the <br /> irrigation efficiency of the irrigation system for a landscaped project. A 90% IME can be <br /> achieved by using evaportranspiration controllers, soil moisture sensors, and other methods that <br /> will adjust irrigation run times to meet plant water needs. <br /> "Irrigation efficiency" or "IE" means the measurement of the amount of water beneficially used <br /> divided by the amount of water applied to a landscaped area. Irrigation efficiency is derived <br /> from measurements and estimates of irrigation system characteristics and management practices. <br /> The minimum average irrigation efficiency for purposes of these Standards is 0.71. Greater <br /> irrigation efficiency can be expected from well designed and maintained systems. The following <br /> <br /> irrigation efficiency may be obtained for the listed irrigation heads with an IME of 90%: <br /> a. Pop-up stream rotator heads = 75% <br /> b. Stream rotor heads = 75% <br /> c. Microspray = 75% <br /> d. Bubbler = 80% <br /> 75A-57 <br /> <br />