All landscaped areas shall be provided with an automatic irrigation system capable of complete coverage of the landscaped areas.
(A) General requirements.
(1) All irrigation equipment must meet American National Standards Institute (ANSI), American Society of Agricultural and Biological Engineers/ International Code Council (ASABE/ICC)802-2014. "Landscape Irrigation Sprinkler and Emitter Standard".
(2) The following areas shall be irrigated with subsurface irrigation or other means that produces no runoff or overspray.
(a) Slopes exceeding 25%.
(b) Areas less than ten feet wide in any direction.
(3) The irrigation system shall be designed to prevent runoff, low head drainage, overspray, or other similar conditions where irrigation water flows onto non-targeted areas such as adjacent property or hardscapes.
(a) Irrigation systems shall be designed for zero run-off onto paved surfaces unless that surface drains to another landscape area.
(b) Spray irrigation must be placed two-feet away from impervious surfaces unless that surface drains to another landscape area.
(c) Proper irrigation equipment and schedules, including features such as repeated cycles, shall be used to closely match application rates to infiltration rates therefore minimizing runoff.
(d) Slopes greater than 25% shall not be irrigated with an irrigation system with an application rate exceeding 0.75 inches per hour, and check valves shall be utilized.
(B) Sprinkler heads. Where used, sprinkler heads shall be selected for proper area coverage, application rate, operating pressure, adjustment capability, and ease of maintenance.
(1) Sprinkler heads and other emission devices shall have matched precipitation rates, unless otherwise directed by the manufacturer's recommendations.
(C) Water meters. A dedicated meter for irrigation is required for non-residential projects with landscape areas of 1,000 square feet or more.
(D) Backflow prevention devices. Backflow prevention devices shall be required to protect the water supply from contamination by the irrigation system.
(E) Pressure regulating equipment. Pressure regulating valves or assemblies shall be installed to ensure that the dynamic pressure at each emission device is within the manufacturer's recommended pressure range for optimal performance.
(F) Flow sensors. Flow sensors are required to detect high flow conditions created by system damage on all non-residential projects 1,000 square feet and greater and residential projects 5,000 square feet and greater.
(G) Controllers. Automatic control systems shall be required for all irrigation systems and must be able to accommodate all aspects of the design.
(1) Automatic irrigation controllers shall utilize either evapotranspiration or soil moisture sensor data, or rain sensing override devices.
(2) Irrigation controllers shall be of a type which does not lose programming data in the event the primary power source is interrupted.
(H) Check valves. Where required on steep slopes, check valves shall be installed to prevent low-head drainage.
(I) Shut-off valves. Locate shut-off valves as close as possible to the point of connection of the water supply, and place where needed to minimize water loss in case of an emergency (such as a main line break) or routine repair.
(Ord. 4823, passed 1-22-24)