§ 98-97. Irrigation system design criteria.

(a)

Irrigation systems shall be designed so that the application rate does not exceed the infiltration rate of the soil and will minimize overspray and runoff. The designer shall refer to section 98-101, which pertains to soil infiltration rates, and the results of the soil tests to meet these design criteria. In general, low volume sprinkler heads, drip emitters and pressure compensation bubblers shall be used throughout the system.

(b)

Irrigation stations shall be separated (e.g., drip versus overhead spray systems). Additional control valves shall be installed to account for different site-specific characteristics (i.e., full sun/full shade, level/sloping, shrubs/lawns, street trees, etc.).

(c)

Maximum sprinkler spacing for both turf and nonturf areas shall be 50 percent of the diameter of the throw (example: 30-foot-diameter nozzles should be no more that 15 feet apart). Spacing of sprinklers shall take into account on-site wind conditions.

(d)

All irrigation systems shall be operated by an automatic controller. At a minimum, each controller shall have a rain shutoff operation, a 14-day calendar, two independent programs, and three cycles per day capabilities.

(e)

The irrigation system shall be designed to allow a complete watering cycle within a 14-hour period.

(f)

All turf areas shall utilize either popup rotary impact heads or spray heads with a minimum riser height of five inches.

(Ord. No. 97-01, § 2(14.10.070), 1-2-1997; Ord. No. 97-13, § 2, 3-26-1997; Ord. No. 97-17, § 2, 9-24-1997)