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(o) 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 /> (p) Swing joints or other riser-protection components are required on <br /> all risers subject to damage that are adjacent to high traffic areas. <br /> (q) Check valves or anti-drain valves are required for all irrigation <br /> systems. <br /> (r) Narrow or irregularly shaped areas, including turf, less than eight <br /> (8) feet in width in any direction shall be irrigated with subsurface <br /> irrigation or a low volume irrigation system. <br /> (s) 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 /> i. the landscaped area is adjacent to permeable surfacing and no <br /> runoff occurs; or <br /> ii. the adjacent non-permeable surfaces are designed and <br /> constructed to drain entirely to landscaping; or <br /> iii. the irrigation designer for the landsca e ro'ect s ecifies <br /> p p J p arl <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 /> iv. Slopes greater than 25% shall not be irrigated with an irrigation <br /> system with a precipitation rate exceeding 0.75 inches per <br /> hour. This restriction may be modified if the landscape <br /> designer of the landscape project specifies an alternative design <br /> or technology, as part of the Landscape Documentation <br /> Package, and clearly demonstrates no runoff or erosion will <br /> occur. Prevention of runoff and erosion must be confirmed <br /> during the irrigation audit. <br /> <br /> (2) Hydrozone <br /> (a) Each valve shall irrigate a hydrozone with similar site, slope, sun <br /> exposure, soil conditions, and plant materials with similar water <br /> use. <br /> 12 <br /> 7 5A-41 <br /> <br />