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Note: Authority Cited: Section 65595, Government Code. Reference: Section 6559b, Government Code <br />and Section 1351, Civil Code. <br />§ 492.7 Irrigation Design Plan. <br />(a) For the efficient use of water, an irrigation system shall meet all the requirements listed in this <br />section and the manufacturers' recommendations. The irrigation system and its related components shall <br />be planned and designed to allow for proper installation, management, and maintenance. An irrigation <br />design plan meeting the following design criteria shall be submitted as part of the Landscape <br />Documentation Package. <br />(1) System <br />(A) Dedicated landscape water meters are highly recommended on landscape areas smaller than 5,000 <br />square feet to facilitate water management. <br />(B) Automatic irrigation controllers utilizing either evapotranspiration or soil moisture sensor data shall <br />be required for irrigation scheduling in all irrigation systems. <br />(C) The irrigation system shall be designed to ensure that the dynamic pressure at each emission device <br />is within the manufacturer's recommended pressure range for optimal performance. <br />1. If the static pressure is above or below the required dynamic pressure of the irrigation system, <br />pressure-regulating devices such as inline pressure regulators, booster pumps, or other devices shall be <br />installed to meet the required dynamic pressure of the irrigation system. <br />2. Static water pressure, dynamic or operating pressure. and flow reading of the water supply shall be <br />measured at the point of connection. These pressure and flow measurements shall be conducted at the <br />design stage. If the measurements are not available at the design stage, the measurements shall be <br />conducted at installation. <br />(D) Sensors (rain, freeze, wind, etc.), either integral or auxiliary, that suspend or alter irrigation <br />operation during unfavorable weather conditions shall be required on all irrigation systems, as <br />appropriate for local climatic conditions. Irrigation should be avoided during windy or freezing weather <br />or during rain. <br />(E) Manual- shut-off valves (such as a gate valve, ball valve, or butterfly valve) shall be required, as <br />close as possible to the point of connection of the water supply, to minimize water loss in case of an <br />emergency (such as a main line break) or routine repair. <br />(F) Backflow prevention devices shall be required to protect the water supply from contamination by the <br />irrigation system. A project applicant shall refer to the applicable local agency code (i.e., public health) <br />for additional backflow prevention requirements. <br />(G) High flow sensors (Tow meters that detect and report high flow conditions created by system <br />damage or malfunction are recommended. <br />(H) The irrigation system shall be designed to prevent runoff, low head drainage, overspray, or other <br />similar conditions where irrigation water flows onto non-targeted areas, such as adjacent property, non- <br />irrigated areas, hardscapes, roadways, or structures. <br />(I) Relevant information from the soil management plan, such as soil type and infiltration rate, shall be <br />utilized when designing irrigation systems. <br />(.i) The design of the irrigation system shall conform to the hydrozones of the landscape design plan. <br />(K) The irrigation system must be designed and installed to meet, at a minimum, the irrigation efficiency <br />criteria as described in Section 492.4 regarding the Maximum Applied Water Allowance. <br />(L) It is highly recommended that the project applicant or local agency inquire with the local water <br />purveyor about peak water operating demands (on the water supply system) or water restrictions that <br />may impact the effectiveness of the irrigation system. <br />(M) In mulched planting areas, the use of low volume irrigation is required to maximize water <br />infiltration into the root zone. <br />15 <br />