§ 15.01.850. Irrigation heads, gate valves and quick couplers.

All irrigation heads, valves and quick couplers shall be commercial grade brand products as currently deemed acceptable by the city public works department. All products must be approved prior to installation. This is done for standardization purposes and inventory control.

1.

Irrigation heads. All irrigation heads shall be set to grade and perpendicular to the finished grades unless otherwise specified. Heads adjacent to curbs and walks shall be from one-half inch to one inch away from the curb or walkway. All nozzles on shall be tightened and adjusted for the proper radius, arc, and gallons.

2.

Gate valves. All gate valves shall be resilient wedge with square key or domestic manufacture non-rising stem, 200 lb water, oil, gas rated. All gate valves shall be installed with valve boxes. Six-inch or twelve-inch extensions shall be added when necessary to bring the valve boxes level with finish grade.

3.

Quick coupling valves. A quick coupling valve shall be installed on all main lines immediately after the backflow prevention device. In addition a quick coupling valve shall be installed at every valve box or valve box cluster (see details). All quick coupler valves shall be installed in a ten-inch round valve box.

4.

Drip irrigation.

a.

Use Rain Bird drip system irrigation products for all drip systems or an approved equal.

b.

Do not exceed five hundred lineal feet of tubing for any single circuit unless zones have been laid out and designed for more.

c.

All supply lines are to be three-fourths-inch Schedule 40 PVC.

d.

Run tubing parallel to contours when possible.

e.

Install drain valve at low point in each zone.

f.

Install air relief valve at high point in each zone.

5.

Quick coupling valve keys. All quick coupling valve keys shall have a hose swivel attached to the key. One key to be turned over to the public works department at completion of the project.

6.

Irrigation risers. Irrigations shall have an adjustable riser assembly (double swing joint) (see details). Spray pop-up irrigation heads shall have a double swing joint riser constructed of funny pipe (swing pipe), spiral barb fittings and appropriate ells on the head side (see details).

(Ord. No. 2007-07-31, §§ 10.5—10.5.6, 7-10-2007)