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Title 23 Department of Water Resources § 492.7
<br />(1) delineate and label each hydrozone by number, letter, or other
<br />method;
<br />(2) identify each hydrozone as low, moderate, high water, or mixed
<br />water use. 'temporarily irrigates) areas of the landscape shall be included
<br />in the low water use hydrazone for the water budget calculation;
<br />(3) identify recreational areas;
<br />(4) identify areas permanently and solely dedicated to edible plants;
<br />(5) identify areas irrigated with recycled water;
<br />(6) identify type of mulch and application depth;
<br />(7) identify soil amendments, type, and quantity;
<br />(8) identify type and surface area of water features;
<br />(9) identify hardscapes (pervious and non -pervious);
<br />(10) identify location, installation details, and 24-hourretentiun or in-
<br />filtration capacity of any applicable stormwater best management prac-
<br />tices that encourage on-site retention and infiltration of stormwater.
<br />Project applicants shall refer to the local agency or regional Water Quali-
<br />ty Control Board for information an any applicable stormwater technical
<br />requirements. Stormwater best management practices are encouraged in
<br />the landscape design plan and examples are provided in Section 492.16.
<br />(11) identify any applicable rain harvesting or catchment technologies
<br />as discussed in Section 492.16 and their 24-hour retention or infiltration
<br />capacity;
<br />(12) identify any applicable graywater di.wharge piping, system com-
<br />ponents and area(s) of distribution;
<br />(13) contain the following statement: "1 have complied with the crite-
<br />ria of the ordinance and applied them for the efficient use of water in the
<br />landscape design plan"; and
<br />(14) bear the signature of licensed landscape architect, licensed land-
<br />scape contractor, or any other person authorized to design a landscape.
<br />(See Sections 5500.1, 5615, 5641, 5641.1, 5641.2, 5641.3, 5641.4,
<br />5641.5, 5641.6, 6701, 7027.5 of the Business and Professions Code, Sec-
<br />fion 832.27 ofTitle 1.6 of the California Code of Regulations, and Section
<br />6721 of the Food and Agriculture: Code.).
<br />Num, Authority cited; Section 65595, Government Cole; and sect ions I 1 and 30,
<br />Governor's Exec.OvderNo. B-29-15 (April 1. 2011). Reference: 5cwlion 65596.
<br />Govemmeni Code, Section 1351, Civil Code; and section 11, Govemor's Exec,
<br />Order No -13-29-15 (April 1, 2015).
<br />HISTORY
<br />1 • New section tiled 9-10-2009; operative 9-10-2009 pursuant to Government
<br />Code section 11343.4 (Reamer 2009, No, 37).
<br />2. Amendment ofurs tion and Non Met] 9. 15-2015; operative 9- 15-2015. Ex-
<br />empt from OAL review aunt urbmimxl to OAL far ppriming only �rursstautt to
<br />Creivemor'x £iecutivci?rdcr Nu. I1-29 15(4-1-20151(RegLsler 2015, Ntr- 3R),
<br />§ 492.7. Irrigation Design Plan.
<br />(a) This section applies to landscaped ares requiring permanent ir-
<br />rigation, not areas that require temporary irrigation solely for the plant
<br />establishment period. For the efficient use of water, an irrigation system
<br />shall meet all The requirements listed in this section and the manufactur-
<br />ers' recommendations. The irrigation system and its related components
<br />shall be planned and designed to allow for proper installation, manage-
<br />ment, and maintenance. An irrigation design plan meeting the following
<br />design criteria shall be submitted as pant of the Landscape. Documenta-
<br />tion Package.
<br />(1) System
<br />(A) Landscape water meters, defined as either a dedicated water ser-
<br />vice meter or private submeter, shall be installed for all non-residential
<br />irrigated landscapes of 1,000 :tel. ft. but not more than 5,000 sq.fl. (the lev-
<br />el at which Water Code 535 applies) and residential irrigated landscapes
<br />of 5,000 sq. ft. or greater. A landscape water meter may be either:
<br />1. a customer service meter dedicated to landscape use provided by the
<br />local water purveyor, or
<br />2. a privately owned meter or submeter.
<br />(B) Automatic irrigation controllers utilizing either evapotranspira-
<br />tion or soil moisture sensor data utilizing non-volatile memory shall be
<br />required for irrigation scheduling in all irrigation systems.
<br />(C) If the water pressure is below or exceeds the recommended pres-
<br />sure of the specified irrigation devices, the installation of a pressure regu-
<br />lating device is required to ensure that the dynamic pressure at each emis-
<br />sion device is within the manufacturer's recommended pressure range
<br />for optimal performance.
<br />L If the static pressure is above or below the required dynamic pres-
<br />sure of the irrigation system, pressure -regulating devices such as inline
<br />pressure regulators, booster pumps, or other devices shall be installed to
<br />meet the required dynamic pressure of the irrigation systLtn.
<br />2. Static water pressure, dynamic or operatingpressurc, and flow read-
<br />ing of the water supply shall be measured at the point of connection.
<br />These pressure and flow measurements shall be conducted at the design
<br />stage. If the measurrnrocnl s are not available at the design stage, the mea-
<br />surements shall be conducted at installation.
<br />(D) Sensors (rain, freeze, wind, etc.), either integral or auxiliary, that
<br />suspend or alter irrigation operation during unfavorable weather condi-
<br />tiows shall be required on all irrigation systems, as appropriate for local
<br />climatic conditions Irrigation should be avoided during windy or freez-
<br />ing weather or during rain.
<br />(E) Manual shut-off val v es (such as a gate valve, ball valve:, or butter-
<br />fly valve) shall be r quired, as close as possible to the point ofcoonce Iion
<br />of the water supply, to minimize water loss in case of an emergency (such
<br />as a main line break) or routine repair.
<br />(F) Backflow prevention devices shall be required to protect the water
<br />supply from contamination by the irrigation system. A project applicant
<br />shall refer to the applicable local Agency code (i.e., public health) far
<br />additional backflow prevention requirements.
<br />(G) Flow sensors that detce:t high flow conditions created by system
<br />damage or malfunction are required for all on non-residential landscape*.
<br />and residential landscapes of 5000 sq. f]. or larger.
<br />(11) Master shut-off valves are required on all projects except land-
<br />scapers that make use of technologies that allow for the individual control
<br />of sprinklers that are individually pressurized in a system equipped with
<br />low pressure shut down features..
<br />(1) The irrigation system shall be designed to prevent runoff; low head
<br />drainage, ovcrspray, or other similar conditions where irrigation water
<br />flows onto non -targeted areas, such as adjacent property, non -irrigated
<br />areas, hardscapes, roadways, or sKructerres.
<br />(3) Relevant informafion from the soil management plan, such as soil
<br />type and infiltrstion rate, shall be utilized when designing irrigation sys-
<br />tems.
<br />(K) The design of the irrigation system shall conform to the hydro -
<br />zones of the landscape design plan.
<br />(L) The irrigation system must be designed and 'Installed to meet, at a
<br />minimum, the irrigation efficiency criteria as described in Section 492.4
<br />regarding the Maximum Applied Water Allowance.
<br />(M) All irrigation emission devices must meet the requirements set in
<br />the American National Standards Institute (ANSI) standard, American
<br />Society of Agricultural and Biological Eagineers'Ante:rnational. Code
<br />Council's (ASABEI]CC) 802-2014 "Landscape Irrigation Sprinkler and
<br />Emitter Standard, All sprinkler heads insulted in the landscape must doc-
<br />ument a distribution uniformity low quarter of 0.65 or higher using the
<br />protocol defined in ASABEACC 802-2014.
<br />(N) it is highly recommended that the project applicant or local agency
<br />inquire with the local water purveyor about peak water operating de-
<br />mands (on the water supply system) or water restrictions that may impact
<br />the effectiveness ofthe irrigation system.
<br />(0) In mulched planting areas, the use of low volume irrigation is re-
<br />quired to maximize water infiltration into the root zone.
<br />(P) Sprinkler heads and other emission devices shall have matched
<br />precipitation rales, unless otherwise directed by the manufachtrcr's rec-
<br />ommendations.
<br />(Q) Head to head coverage is recommended. However, sprinkler spac-
<br />ing shall be designed to achieve the highest possible distribution unifor-
<br />mity using the manufitcturer's recommendations.
<br />(R) Swing joints or other riser -protection components arc required on
<br />all risers subject to damage that are: adjacent to hard:ecapes or in high tral=
<br />fie areas of turfgrass.
<br />Page 38.5 Regwa an5, No ss; 9 -t8 -urs
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