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January 11, 2016 <br />(o) In mulched planting areas, the use of low volume irrigation (drip <br />or low volume overhead irrigation) is required to maximize water <br />infiltration into the root zone; with the exception of areas with fuel <br />modification requirements and/or those that require plant <br />establishment to comply with local grading ordinances. <br />(p) Sprinkler heads and other emission devices shall have matched <br />precipitation rates, unless otherwise directed by the <br />manufacturer's recommendations. <br />(q) Head to head coverage is recommended. However, sprinkler <br />spacing shall be designed to achieve the highest possible <br />distribution uniformity using the manufacturer's recommendations. <br />(r) Swing joint components are required on all sprinklers subject to <br />damage that are adjacent to hardscapes or in high traffic areas of <br />turf. <br />(s) Check valves or anti -drain valves are required on all sprinkler <br />heads where low point drainage could occur. <br />(t) Areas less than ten (10) feet in width in any direction shall be <br />irrigated with subsurface irrigation or other means that produces no <br />runoff or overspray. <br />(u) Overhead irrigation shall not be permitted within 24 inches of any <br />non - permeable surface. Allowable irrigation within the setback <br />from non - permeable surfaces may include drip, drip line, or other <br />low flow non -spray technology. The setback area may be planted <br />or unplanted. The surfacing of the setback may be mulch, gravel, <br />or other porous material. These restrictions may be modified if: <br />1. the landscape area is adjacent to permeable surfacing and no <br />runoff occurs; or <br />2. the adjacent non - permeable surfaces are designed and <br />constricted to drain entirely to landscaping; or <br />3. the irrigation designer for the landscape project specifies an <br />alternative design or technology, as part of the Landscape <br />Documentation Package, and clearly demonstrates strict <br />adherence to the irrigation system design criteria in Section 2.5 <br />(a)(1)(H) hereof. Prevention of overspray and runoff must be <br />confirmed during an irrigation audit. <br />4. slopes greater than 25% shall not be irrigated with an irrigation <br />system with a application rate exceeding 0.75 inches per hour. <br />This restriction may be modified if the landscape designer of <br />15 <br />75C -41 <br />