§ 12-1.05. Irrigation Plan Specifications.

(a)

Three (3) copies of the irrigation plans shall be submitted for review and approval by the Parks, Recreation and Neighborhoods Director to ensure adequate irrigation coverage and compliance with the requirements of the Plumbing Code of the City. The irrigation system shall be designed with water conservation in mind. Wind direction, surface drainage, soil type, and application method shall be considered.

(b)

Irrigation plan shall indicate potable water system point of connection and size, water pressure available, and maximum demand of the system in gallons per minute or gallons per hour if appropriate.

Reclaimed water may also be used as an alternate irrigation water source if it is supplied through a dual distribution system that conforms to Stanislaus County Health Department Standards.

(c)

Irrigation equipment specified must be identified by manufacturer's name and equipment identification number.

(d)

Performance data for irrigation heads and emitters including discharge rates, effective diameter, and operating pressure shall be listed in irrigation legend.

(e)

All locations of irrigation valves, controllers, hose bibs, quick coupler valves, sprinkler heads, and backflow prevention devices, valves, filters, pressure regulators, emitters, rain switches, and moisture sensors must be indicated.

(f)

Irrigation details must be used to clarify particular situations. Typical details should include backflow prevention devices, valves, irrigation heads, emitters, filters, pressure regulators, moisture sensors, rain switches, check valves, and irrigation controllers.

(g)

All irrigation lines must be sized.

(h)

Schedule 40 P.V.C. pipe for mainline and laterals under two (2) inch outside diameter, and Class 315 pipe for mainline and laterals over two (2) inch outside diameter is required under all paved areas. Piping must be installed (in sleeves under all paved areas) at a minimum depth of eighteen (18) inches cover over the top pipe for lateral irrigation lines and a minimum of twenty-four (24) inches cover over the top of pipe for mainline. Emitter distribution tubing may be located at grade. Each tree well or planting area shall have one (1) bubbler and three (3) foot minimum tree deep root watering tube located at base of each tree.

(i)

Irrigation watering schedules for the entire year must be provided on irrigation drawings. These schedules will include an establishment (first twelve (12) months) and post-establishment. Post-establishment schedules will be divided into four (4) quarters. Those quarters are winter, spring, summer and fall. All watering schedules must be in compliance with current City of Modesto water scheduling requirements.

(j)

Irrigation system must be designed by a qualified designer. Qualified designers would include: certified irrigation designers, landscape contractors, and landscape architects, and engineers.

(k)

Pop-up sprinklers in turf areas shall have a minimum four (4) inch pop-up height. Sprinkler coverage shall be one hundred (100) percent. Heads shall be placed at a maximum of fifty (50) percent of the diameter of throw (head to head). Sprinkler heads must have matched precipitation rates within each control valve circuit. System should be designed for minimum runoff and over-spray onto non-irrigated areas.

(l)

Sprinklers and sprays shall not be used in areas less than seven (7) feet wide. Drip and bubblers shall be used that do not exceed one and one-half (1.5) gallons per minute per device.

(m)

Serviceable check valves are required where elevation differential may cause low head drainage.

(n)

Irrigation controllers must be capable of dual or multiple programming. Controllers must have multiple cycle start capacity and a flexible calendar program. Controllers shall be set to operate between sunset and sunrise.

(o)

Water application rates shall not exceed the infiltration rate of soil. A minimum of a one (1) hour period shall be allowed prior to the application of additional water.

(Added by Ord. 2355-C.S., § 1, amended by Ord. 2836-C.S., § 1, Ord. 3072-C.S., § 2, and Ord. 3313-C.S., § 1, effective 8-21-03)