75C - PH - AMEND ZONING WATER EFFICIENT LANDSCAPE

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January 11, 2016 the landscape project specifies an alternative design or technology, as part of the Landscape Documentation Package, and clearly demonstrates no runoff or erosion will occur. Prevention of runoff and erosion must be confirmed during the irrigation audit. (2) Hydrozone (a) Each valve shall irrigate a hydrozone with similar site, slope, sun exposure, soil conditions, and plant materials with similar water use. (b) Sprinkler heads and other emission devices shall be selected based on what is appropriate for the plant type within that hydrozone. (c) Where feasible, trees shall be placed on separate valves from shrubs, groundcovers, and turf to facilitate the appropriate irrigation of trees. The mature size and extent of the root zone shall be considered when designing irrigation for the tree. (d) Individual hydrozones that mix plants of moderate and low water use or moderate and high water use may be allowed if: 1. The plant factor calculation is based on the proportions of the respective plant water uses and their respective plant factors; or 2. The plant factor of the higher water using plant is used for the calculations. (e) Individual hydrozones that mix high and low water use plants shall not be permitted. (f) On the landscape design plan and irrigation design plan, hydrozone areas shall be designated by number, letter, or other designation. On the irrigation design plan, designate the areas irrigated by each valve and assign a number to each valve. (g) The irrigation design plan, at a minimum, shall contain: 1. the location and size of separate water meters for landscape; 2. the location, type, and size of all components of the irrigation system, including controllers, main and lateral lines, valves, sprinkler heads, moisture sensing devices, rain switches, quick couplers, pressure regulators, and baclflow prevention devices; 16 75C -42