Skip to code content (skip section selection)
The following standards conserve water and assist in carrying out design principles.
A. Water Conservation Design
shall incorporate water-conserving designs. A water-conserving design must take into account soil and drainage factors and microclimates, includes grouping of plants with similar water standards and use of efficient irrigation systems, and attempts to preserve on- vegetation.
B. Use of Reclaimed Water
1. Reclaimed water must be used in new and expanded in accordance with the adopted Mayor and Council Water Policies and other applicable and local standards.
2. The availability of a reclaimed water service does not confer any right to plant areas except as permitted under this Section 7.6.4.D, Use of .
C. Stormwater Runoff
1. Storm water detention/retention basins not integrated with paved must be designed in accordance with the Storm Water Detention Retention Manual.
2. , hydrology, and landscape structural plans must be integrated to make maximum use of storm water runoff for supplemental on- irrigation purposes. The shall indicate use of all runoff, from individual catch basins around single trees to basins accepting flow from an entire or roof area.
D. Ornamental Water Features
1. Ornamental water features, such as fountains or ponds, may be used, if all the following conditions are met.
a. The total water surface area does not exceed 1% of the net of the .
b. The water feature is located within the oasis area.
c. The sum of the square feet of water surface area and the square feet of area does not exceed the total allowed square feet for the .
d. Water in moving water features is recycled through the feature.
e. The water feature is designed to prevent water seepage or leaking.
2. This section does not apply to swimming pools or spas.
1. A water-conserving irrigation system is required for all new landscape plantings. For that are larger than one and on which the of all is more than 10,000 square feet, an underground irrigation system is required.
2. Storm water and runoff harvesting to supplement drip irrigation are required elements of the irrigation system for both new plantings and preserved vegetation.
3. An irrigation plan must be submitted together with the required in Section 7.6.9.B, Review Procedures, and must comply with the standards below.
a. System Specifications
(1) The source of irrigation water, whether potable or reclaimed, must be indicated on the irrigation plan.
(2) Rigid irrigation pipes and flexible drip system irrigation lines under paved surfaces must be contained in pipe sleeves.
(3) Pipes or lines carrying water under constant pressure must be buried to a minimum depth of 24 inches. Those that are under intermittent pressure must be buried to a minimum depth of 18 inches.
(4) Nonpressure polyethylene lines must be buried to a minimum depth of eight inches. Nonpressure PVC lines must be buried to a minimum depth of 12 inches.
(5) , shrub, and bubbler heads closer than 12 inches to any paved surface must be pop-up heads.
(6) , shrub, and bubbler heads located within 24 inches of any paved surface must be installed with a system that allows the riser assembly to absorb impacts and return to normal position.
(7) Spray irrigation systems may be used only in the oasis area for . These areas must be served by low precipitation rates. Matched precipitation rate heads should be used.
(8) Temporary spray irrigation systems may be used to establish hydroseeded areas. All other plant material, excluding , must be irrigated with drip irrigation or low-flow bubblers. Drip irrigation is encouraged. The systems will be reviewed on a case-by-case basis.
(9) Trees and shrubs outside of areas of spray irrigation must be irrigated with low-flow bubblers or emitters.
(10) Unless required under the rainwater harvesting ordinance, rain-sensing and moisture-sensing devices are encouraged.
b. System Design and Layout
(1) Irrigation systems must be designed with attention to prevailing winds, degree of , type of soil, soil percolation (infiltration), season, and type of vegetation to be watered. These design constraints, and any others that may be specific to the , must be clearly indicated on all irrigation documents.
(2) Spray irrigation systems shall be designed to provide 100% head-to-head coverage of the area of irrigation to avoid dry spots and overspray onto any paved or unplanted surface.
(3) Areas of different water requirements, such as the oasis, trees and shrubs, the , landscape borders, and areas, must be controlled by separate remote control valves.
(4) The design of irrigation systems and irrigation schedules should attempt to match application rates with infiltration rates in order to minimize runoff and reduce evaporation.
(5) Sprinkler heads and nozzles within each control valve should have matching precipitation rates.
(6) Spray irrigation systems may not be installed in planting strips less than ten feet wide. Strip spray heads are not be allowed.
(7) Irrigation timers must be set for irrigation cycles between 8:00 p.m. and 8:00 a.m. between May and September to minimize water loss due to evaporation.
(8) Rain-sensing and moisture-sensing devices are encouraged.
4. Temporary irrigation proposals may be reviewed on a case-by-case basis.