75A - PH - WATER EFFICIENT LANDSCAPING

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(f) Backflow prevention devices shall be required to protect the water supply from contamination by the irrigation system. A project applicant shall refer to the applicable City code (i.e., public health) for additional backflow prevention requirements. (g) High flow sensors that detect and report high flow conditions created by system damage or malfunction are recommended. (h) 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, non-irrigated areas, hardscapes, roadways, or structures. (i) Relevant information from the soil management plan, such as soil type and infiltration rate, shall be utilized when designing irrigation systems. (j) The design of the irrigation system shall conform to the hydrozones of the landscape design plan. (k) Average irrigation efficiency for the project shall be determined in accordance with the EAWU calculation sheet in Appendix B. Unless otherwise indicated by the irrigation equipment manufacturer's specifications or demonstrated by the project applicant, the irrigation efficiency of the irrigation heads used within each hydrozone shall be assumed to be: Pop-up stream rotator heads = 75% Stream rotor heads = 75% Microspray = 75% Bubbler = 80% Drip emitter = 85% Subsurface irrigation = 90% (1) It is highly recommended that the project applicant inquire with the City about peak water operating demands (on the water supply system) or water restrictions that may impact the effectiveness of the irrigation system. (m) In mulched planting areas, the use of low volume irrigation is required to maximize water infiltration into the root zone. (n) Sprinkler heads and other emission devices shall have matched precipitation rates, unless otherwise directed by the manufacturer's recommendations. 11 75A-40