# Presentation: 196869

##  IS-5:  Achieving Irrigation Water Management (IWM) 

_**with Pivot Sprinkler System**_
_**Basic Requirements:**_
- Water Source
- Pumping Plant
- Power Source
- Mainline
- Laterals
- Sprinklers
- Chemigation Valves
- Pressure Gauge
- Water Meters

- LEPA System
- Low Energy Precision Spray

- LESA System
- Low Elevation Spray

- MESA System
- Mid Elevation Spray

## Slide 2

| Page 2 | Title | Purpose |
| --- | --- | --- |
| Page 1 | Achieving Irrigation Water Management (IWM) with
Pivot Sprinkler Systems | To describe the basic requirements of pivot sprinkler systems |
| Page 2 | Table of Contents | Table of Contents |
| Page 3 | Pictures of basic sprinkler system hardware | To demonstrate the components that are required for a sprinkler system |
| Page 4 | Pictures of basic LEPA system characteristics | To demonstrate agronomic characteristics of a lepa system |
| Page 5 | Characteristics of Pivot sprinkler systems | Criteria:  Design Capacity, Design App. Rate, Distribution Patterns, Nozzle Spacing, Heights, Slopes. |
| Page 6  | System Planning and Design | Planning, Design and System Performance Requirements |
| Page 7 | Crop and Soil Characteristics | Needed for planning & design and used for IWM documentation of irrigation efficiencies achieved |
| Page 8 | Detailed Evaluation for Center Pivot Lateral Worksheet | Catch Can Data Worksheet |
| Page 9 | System Evaluation and Potential Water Savings | Evaluates system performance |
| Page 10 | Pictures of a basic sideroll irrigation system | To demonstrate basic characteristics of a sideroll system |
|  |  |  |
| NOTE: The above information and documentation is intended to serve as a simple-to-use GUIDE by producers, Natural Resource Conservation Service (NRCS) planners and others involved in Irrigation Water Management. For further assistance on the use of this GUIDE, contact your local NRCS.  |  |  |

## Chemigation Valve

- Pressure Gauge (Start)

- Pressure Gauge (End)

- Flow meter

## Furrow Diking

- Soft Middles

## CHARACTERISTICS OF PIVOT SYSTEMS

| Criteria | Center Pivot or Linear Move | LEPA | LESA | LPIC & MESA |
| --- | --- | --- | --- | --- |
| Design Capacity | Either: Capacity to meet the peak water demands of all irrigated crops in the design area,                                                                                                 Or:  Capacity adequate to meet requirements of selected irrigations during critical crop growth periods when planning less than full irrigation |  |  |  |
| Design Application Rate | Runoff, translocation and unplanned deep perculation shall be minimized |  |  |  |
| Distribution Patterns | CU ≥ 85% or DU ≥ 76%, Nozzles ≤ 7 ft. high shall have a CU ≥ 90% | CU ≥ 94% | CU ≥ 94% | CU ≥ 90% for nozzles ≤ 7 ft. high, CU ≥ 85% for MESA for nozzles greater than 7 ft. high |
| Nozzle Spacing | Spray Nozzles shall be ≤ 25% of wetted diameter, and Impact Nozzles shall be ≤ 50% wetted diameter | Not to exceed twice the row spacing of the crop or 80 inches |  | Not to exceed every other row when operated in canopy for 50% or more of the growing season |
| Heights | Varies | 8 - 18 inches | 12 – 24 inches | 5 – 10 feet |
| Slope | Not to exceed 20%  | Not to exceed 1% on more than 50% of the field | Not to exceed 3% on more than 50% of the field | Not to exceed 3% on more than 50% of the field for fine textured soils, and not to exceed 5% on more than 50% of the field for coarse textured soils |

## Slide 6

|                                             SYSTEM  PLANNING & DESIGN |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- |
| PLANNING
Calculate the required system capacity
Determine water availability
Estimate your irrigated area
Physical considerations- H20 quality, Soil variations
DESIGN
Pivot- labor savings, operating costs
SYSTEM PERFORMANCE
System checks
System Capacity
System Uniformity
System Average Application Rate
System Field Application Efficiency |  |  |  |  |  |
|  |  |  |  |  |  |
| PLANNING |  | DESIGN |  | SYSTEM PERFORMANCE |  |
| Calculate the required system capacity | Q= 453 Ad
         f T | Pivot | Labor
Operating Cost
Sprinkler Package | System Checks | The supplier should provide this service
1. System Capacity
2. Distribution Uniformity
3. Energy Consumption |
| Determine water availability | This is done through well testing |  |  | System Capacity | Q= 453 Ad      A=Irrigated area (acres)
         f    T        d=Gross depth of water applied (in.)
                         f= Irrigation period (#days in #day    
                              interval)
                         T=hrs./day (operating system) |
| Estimate your irrigated area | A= Q  f  T
      453  d
          |  |  | System Uniformity | Catch Can |
| Physical considerations | H20 quality,              Soil variations |  |  | System Average Application Rate | Ratio of nozzle flow rate to its wetted area
Where AAR exceeds the infiltration rate runoff results |
|  |  |  |  | System Field Application Efficiency | App. Eff. = Irr. Water available to crop  x  100
                    Volume of water supplied   |
| NOTE:. |  |  |  |  |  |

## Slide 7

## Slide 8

## SYSTEM EVALUATION AND POTENTIAL WATER SAVINGS

**SYSTEM EVALUATION AND POTENTIAL WATER SAVINGS**

## Sideroll Irrigation