**NATURAL RESOURCES CONSERVATION SERVICE**

**Idaho**

**CONSTRUCTION SPECIFICATIONS**

**FOR**

> **IRRIGATION SYSTEM, SPRINKLER**

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(Owner/Operator)

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(Project/Title)

GENERAL

Irrigation sprinkler systems shall be installed in accordance with a
design and plan approved by the responsible technician. Details of
construction shown in the design and plan but not included herein shall
be considered as a part of this specification. Construction activities
shall be in accordance with U.S. Department of Labor, Occupational
Safety and Health Administration (OSHA) regulations.

MAINLINES

The mainline materials and installation shall meet the requirements of
Idaho Construction Specification for Irrigation Pipelines for the
respective pipe material or materials specified.

LATERAL LINES

The mainline riser spacing, lateral lines and/or pivot line and nozzles
shall be of the size, type, pressure rating and spacing as shown on the
design. When a uniformity coefficient is specified in the design, the
combination of nozzle spacing, size(s) of operating pressure, flow and
wetted diameter shall be evaluated to see that the selected equipment
meets or exceeds the specified uniformity coefficient. When a uniformity
coefficient is not specified, the sprinkler performance data shall be
evaluated to see that required spacing criteria is met.

CENTER PIVOTS AND LATERAL MOVE SYSTEMS

All materials will be compatible with the environment in which they are
to be used. All structural members shall be designed in

accordance with the latest specification issued by the American
Institute of Steel Construction (AISC).

The irrigation equipment shall be able to withstand a wind load
equivalent to a minimum of a 90-mph wind directed perpendicularly to the
axis of the equipment with a minimum Factor of Safety of 1:1, no water
in the system and on flat ground.

All exposed steel members shall be galvanized or epoxy coated. All
electric components shall meet the requirements of ASAE Standard ASAE S
397.2.

The moving units shall maintain a straight alignment within
manufacturing tolerance when moving. The units shall have safety shields
on chains, sprockets and any other parts creating danger to the
operator.

Sprinklers and spray heads shall apply the designed gallons per minute
at the designed pressure and minimum wetted diameter. [The supplier
shall provide a manufacturer's pivot nozzle package for the installed
equipment.]{.underline} This package is required before the installation
can be certified by Natural Resource Conservation Service personnel.

All components of such systems shall be compatible.

WHEEL LINES

Where the aluminum pipe (lateral) is to be used to transmit torque from
moving unit to the wheels, tubing shall be 4 inches or 5 inches in
diameter (wall thicknesses: 4-inch tubing 0.072-inch; 5-inch tubing
0.078-inch) meeting the requirements of ASAE Standard ASAE S 263.3.
Joints shall be by a lug or tooth type flange coupler.

Wheels shall be constructed of a minimum of 18 gage galvanized steel.
Hubs and cleats shall be manufactured from a minimum of 12 gage
galvanized steel. Spokes shall be manufactured from 3/8-inch wire and
shall be zinc plated.

The moving unit and main line shall maintain a straight alignment within
manufacturing tolerances when moving. The moving unit shall have safety
shields on chains, sprockets and any other parts creating danger to the
operator. The engine shall have a cover that provides protection from
weather and vandalism.

Sprinklers shall be self-leveling. Sprinklers provided shall apply the
designed gallons per minute at the designed pressure and minimum wetted
diameter. To insure that all fittings are adaptable, the wheel line
supplier will also supply the following items made by the same
manufacturer to make a complete and workable irrigation system:

A complete telescope, or hose connection, or swing line suitable to
supply water from the mainline riser valve to the wheel line unit shall
be provided. A hydrant or valve opener that will adapt with the
connecting main or sub-main line will be supplied with each wheel line
unit.

DELIVERY REQUIREMENTS

The contractor shall furnish the services of a fully qualified trained
mechanic or technician to supervise, inspect and assemble the equipment.
It is required that under his/her supervision and responsibility the
equipment will be completely adjusted and all equipment installed and
completely lubricated with the grade of lubricant recommended by the
manufacturer for continuous operation.

In addition, the user(s) shall be instructed in the proper operation and
maintenance of the unit. All of the materials required for the foregoing
operations shall be furnished by the contractor.

APPURTENANCES

Valves, fittings, vents, nozzles, etc. shall be of suitable size, type,
pressure rating and capacity to provide efficient operation and keep
pressures in the system within allowable working limits. An in line
check valve or other anti-pollution device shall be installed on
sprinkler systems in which any fertilizer, pesticide or animal waste is
injected into the system. Such devices shall meet the minimum
requirements of the Idaho Department of Agriculture for chemigation
valves. All appurtenances shall have suitable markings that show model
number, pressure ratings, diameter, etc. as applicable. When requested
by the technician, the manufacturer's technical performance data shall
be provided to NRCS.

PUMP AND POWER UNIT

The pump or combination of pumps shall be capable of delivering the
water capacity at the total dynamic head as specified on the drawings.
The power unit shall be capable of operating the pump at maximum
capacity and head without being in an overload condition. The pump and
power unit shall be in accordance with manufacturer\'s recommendations.

All electrical wiring and equipment shall be in accordance with the
current standards of the National Electrical Manufacturers Association
(NEMA), the Underwriters Laboratory, Inc. (UL), and the State of Idaho
regulations. Installation shall be certified by a State of Idaho
licensee.

PUMPING PLANT

Pumping plants specified on the drawings shall meet the requirements of
Idaho Construction Specification, Pumping Plant (533).

TESTING

The system shall be given an operational test. This test shall consist
of normal start-stop and running operations. All of the system
components shall operate without difficulty. Leakage or defects caused
by poor materials or workmanship shall be corrected by the contractor.

ADDITIONAL SPECIFICATIONS