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Adopted 7/16/2001 - r~fective 8/15/2001 City of San Leandro Zoning Code -Article 19 (includes amendments effective through 2007) 9. The irrigation system shall be designed to ensure that the dynamic pressure at each emission device is within the manufacturer's recommended pressure range for optimal performance. 10. Sensors (rain freeze wind etc.) either integral or auxiliary, that suspend or alter irrigation operation during unfavorable__weather conditions shall be required on all irri ation systems, as appropriate for local climatic conditions. Irrigation should be avoided during windy or freezing weather or during rain. 11. Manual shut-off valves -(such as a pate valve, ball valve, or butterfly valve) shall be required as close as possible to the point of connection of the water supply, to minimize water loss in case of an emergency (such as a main line break) or routine repair. 12. Backflow prevention devices shalt be required to protect the water supply from contamination by the irrigation system. 13. The irrigation system shall be designed to prevent runoff, low head drainage oversprav or other similar conditions where irrigation water flows onto non-targeted areas, such as adjacent property,. non- irrigated areas, hardscapes, roadways, or structures. 14. In mulched planting areas, the use of low volume irrigation is required to maximize water infiltration into the root zone. 15. Sprinkler spacing shall be designed to achieve to achieve a uniform precipitation rate with no oversprav onto hardscapes. 16. Swing joints or other riser-protection components are required on all risers subject to damage that are adjacent to high traffic areas. 17. Check valves or anti-drain valves are required for all irrigation systems. 18. Narrow or irregularly shaped areas, including turf, less than eight (8) feet in width in any direction shall be irrigated with subsurface irrigation or low volume irrigation system. Overhead irrigation shall not be permitted within twenty-four (24) inches of any non-permeable surface. Allowable irrigation within the setback from non-permeable surfaces may include drip, drip line, or other low flow non-spray technology. 19. For the efficient use of water, all irrigation schedules shall be developed, managed, and evaluated to utilize the minimum amount of water required to maintain plant health. Irrigation scheduling shall be regulated by automatic irrigation controllers. Overhead irrigation shall be scheduled between 8:00 p.m. and 10:00 a.m. unless weather conditions prevent it. If allowable hours of irrigation differ from the local water purveyor, the stricter of the two shall apply.. Operation of the irrigation system outside the normal watering window is allowed for auditing and system maintenance. AR.19 Page 13 of 198