# Presentation: 010669

## (IS-6)         Achieving Irrigation Water Management (IWM) With                           Irrigation Water Conveyance – Pipeline

- _Basic requirements:_    				_Benefits:                                                                     _
- Irrigation pipelines come in a variety of diameters (4” to                 	Increases efficiency of water delivery from well
- 24” are the most common) and a variety of materials		to point of irrigation.
- (Poly Vinyl Chloride, Steel, Non-reinforced concrete, and 	Maintenance is minimal compared to an earthen
- Aluminum).					ditch or concrete lined ditch.
- Irrigation pipelines are used with sprinklers, drip systems,	Will work on any field, regardless of shape.
- and flood applications on a variety of crops.

- Photo From Ft. Sumner FO

- 24” PVC  Pipe

- IS-6

## Page 2			   Table Of Contents

| Page # | Title | Purpose |
| --- | --- | --- |
| 1 | Achieving Irrigation Water Management (IWM) with 
Irrigation Pipelines | To describe the basic requirements and benefits obtained
with irrigation pipelines |
| 2 | Table of Contents | Table of Contents |
| 3 | Friction Loss Table | Example of friction loss table to assist in sizing irrigation pipeline |
| 4 | Pump Discharge Assembly | To show valves on a typical pump discharge assembly |
| 5 | Typical Pump Discharge Assembly | To show typical set up of valves for a pressurized irrigation pipeline at the well assembly |
| 6 | Pump Dogleg Assembly | To show typical pump dogleg assembly |
| 7 | Typical Gravity Discharge Assembly | To show typical gravity discharge assembly |
| 8 | Pipe Markings | To provide explanation of typical pipe markings |
| 9 | Tee & Elbows | To show tees and elbows in an irrigation pipeline system  |
| 10 | Thrust Blocks | To show typical types of thrust blocks |
| 11 | Minimum Depth of Cover | To show minimum depth of cover for different sizes |
| 12 | Documentation of Depth of Cover | Photo verification of depth |
|  |  |  |
|  |  |  |
|  |  |  |

- IS-6

## Page 3		Friction Loss In Plastic Pipe (Ft / 100 Ft)			          (example)

|                                  Diameter In Inches |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|  |  | 8 | 8 | 10 | 10 | 12 | 12 | 15 | 15 | 18 | 18 |
| Flow
GPM | Flow
CFS | Vel
Ft/sec | Hf | Vel
Ft/sec | Hf | Vel
Ft/sec | Hf | Vel
Ft/sec | Hf | Vel
Ft/sec | Hf |
| 450 | 1.00 | 2.865 | 0.330 | 1.833 | 0.101 | 1.273 | 0.038 |  |  |  |  |
| 600 | 1.33 | 3.820 | 0.588 | 2.445 | 0.179 | 1.698 | 0.068 |  |  |  |  |
| 900 | 2.00 | 5.730 | 1.322 | 3.667 | 0.402 | 2.546 | 0.152 |  |  |  |  |
| 1500 | 3.33 | 9.549 | 3.672 | 6.112 | 1.118 | 4.244 | 0.423 | 2.716 | 0.129 | 1.886 | 0.049 |
| 2000 | 4.44 |  |  | 8.149 | 1.987 | 5.659 | 0.752 | 3.622 | 0.229 | 2.515 | 0.087 |
| 2500 | 5.56 |  |  |  |  | 7.074 | 1.175 | 4.527 | 0.358 | 3.144 | 0.135 |
| 3000 | 6.76 |  |  |  |  |  |  | 5.432 | 0.515 | 3.773 | 0.195 |
| 4000 | 8.89 |  |  |  |  |  |  | 7.243 | 0.916 | 5.030 | 0.346 |

- To properly size the pipeline diameter, choose a velocity less than 5.0 Ft/sec and a friction loss (Hf) equal to,
- or less than, 1.0 Ft/100 Ft.  Friction loss will vary based on pipe material, pipe diameter, change in elevation,
- and flow rate.
- Note: Cubic Feet Per Second (CFS) x 450 = Gallons Per Minute (GPM)

- IS-6

## Page 4

- Chemigation Valve

- Pump Discharge Assembly

- Injection Hose

- Air Vent & Vacuum
- Relief Valve

- Pressure Relief Valve

- Photos From Alamogordo FO

- IS-6

## Page 5		    Typical Pump Discharge Assembly

**VRV = Vacuum Relief Valve**
**PRV = Pressure Relief Valve**
**A-VRV = Air and Vacuum Relief **
**               ****Valve           **

- IS-6

## Typical Pump Dogleg Assembly

- Page 6

- Chemigation
- Valve

- Flow Meter

- Air Vent & Vacuum
- Relief Valve

- Pressure Relief
- Valve

- Pressure
- Gauge

- Photo From Alamogordo FO

- IS-6

## Page 7		      Typical Gravity Discharge Assembly

- IS-6

## Plastic Irrigation Pipe MarkingsExample

- Manufacturer’s
- Name

- Pipe Diameter

- Pressure
- Rating

- Pipe Description -
- i.e. Plastic Irrigation
- Pipe (PIP)

- NRCS Practice
- Description

- Material
- Designation

- Page 8

- Photo From Clayton FO

- IS-6

## Irrigation PipelineTee and Elbow

- Coupler

- Tee

- Elbow

- Page 9

- Photo From Alamogordo FO

- IS-6

## Page 10			Typical Types Of Thrust Blocks

- IS-6

## MINIMUM DEPTH OF COVER

- Pipe shall be installed at sufficient depth below the ground surface to provide protection from hazards imposed by traffic crossings, farming operations, freezing temperatures, or soil cracking. The minimum depth of cover for pipe susceptible to any of these hazards shall be:

| Pipe Diameter (in.) | Depth of Cover (in.) |
| --- | --- |
| 1⁄2  through  2 1⁄2  | 18 |
| 3  through  5 | 24 |
| 6 or more | 30 |

- In areas where  the pipe will not be susceptible to freezing and vehicular or cultivation hazards, and the soils do not crack appreciably when dry, the minimum depth of cover may be reduced to:

| Pipe Diameter (in.) | Depth of Cover (in.) |
| --- | --- |
| 1⁄2  through  1 1⁄2  | 6 |
| 2  through  3 | 12 |
| 4  through  6  | 18 |
| 6 or more | 24 |

- Page 11

- IS-6

## Documentation of Depth of Cover

- Page 12

- Photo from Estancia FO

- IS-6