IRRIG8-online: Travelling Irrigation Machine Calculator User Guide

Version 0.0.8 – Enhanced Distribution Uniformity Analysis with Overlap Correction

Table of Contents

  1. Overview
  2. Getting Started
  3. Step-by-Step Usage Guide
  4. Understanding Your Results
  5. Technical Background
  6. CSV Data Upload Guide
  7. Troubleshooting
  8. Best Practices
  9. Professional Standards

Overview

The Travelling Irrigation Machine Calculator is a specialized WordPress plugin designed for comprehensive evaluation of travelling irrigation systems including big guns, travelling irrigators, and boom systems. It provides professional-grade distribution uniformity analysis following industry standards.

Key Features

  • Complete System Evaluation – From farm setup to professional reporting
  • Individual Transect Speed Testing – Account for varying terrain conditions
  • Distribution Uniformity Analysis – Using Equation 29 with overlap correction
  • Christiansen Uniformity Coefficient – Calculated using Equation 33
  • Transverse Uniformity Testing – Following Section 4.5.13.4 standards
  • CSV Data Import – Enhanced security with custom collector count support
  • Professional Reporting – Comprehensive analysis with charts and recommendations
  • Multi-Lane Field Support – Rotation timing and efficiency calculations

Who Should Use This Tool

  • Irrigation Consultants – Professional system evaluations and audits
  • Agricultural Engineers – Design validation and performance analysis
  • Farm Managers – System optimization and efficiency monitoring
  • Researchers – Academic studies and field trials
  • Equipment Dealers – Demonstration of system performance

Getting Started

Before You Begin

Required Equipment:

  • Collection containers (uniform diameter, 250mm recommended)
  • Measuring cylinder for volume measurement
  • Stopwatch for speed tests
  • Pressure gauges
  • GPS or survey equipment for elevation data

Recommended Test Setup:

  • 3-6 transect lines perpendicular to travel direction
  • 11-21 collectors per transect line (extending beyond wetted radius)
  • Control collector for evaporation measurement
  • Weather monitoring during test period

Step-by-Step Usage Guide

Tab 1: Farm Information

Document your evaluation project details:

Farm & Property Information

  • Farm Name – Property being evaluated
  • Farm Owner/Manager – Primary contact person
  • Farm Location – Address or general location

Consultant & Evaluation Details

  • Consultant/Evaluator Name – Person conducting analysis
  • Organisation – Company or agency performing evaluation
  • Evaluation Date – When field testing was conducted

Best Practice: Complete documentation ensures professional reporting and helps track multiple evaluations across different sites and seasons.

Tab 2: Machine Information

Configure your travelling irrigation system parameters:

Equipment Information

  • Travelling Irrigator Machine – Specific model being tested
  • Machine Type – Select from:
    • Reel Machine (Hard Hose)
    • Traveller Machine (Soft Hose)
    • Self Propelled Reel Machine
  • Water Distribution System – Choose:
    • Big Gun
    • Fixed Boom
    • Rotating Boom

System Dimensions

  • Total Machine Flow (L/s) – Actual measured flow rate
  • Irrigation Strip Length (metres) – Travel path distance (Lt)
  • Irrigation Strip Width (metres) – Strip spacing between adjacent passes (E)
  • Lanes per Field – Number of parallel irrigation lanes
  • Sprinkler Wetted Radius (metres) – Distance from gun to edge of wetted pattern (rw)
  • Strip Overlap Percentage (%) – Calculated automatically or manual entry

Calculated Fields:

  • Irrigated Area per Run – Area covered in single pass
  • Total Irrigated Area – Complete field coverage including all lanes

Soil Information

  • Soil Type – Select appropriate soil classification
  • Soil Infiltration Rate (mm/hour) – Basic infiltration rate
  • Target Application Depth (mm) – Desired irrigation depth per pass

Important: Accurate strip width and wetted radius are critical for overlap calculations and uniformity analysis.

Tab 3: Speed Test

Conduct speed testing for accurate application rate calculations:

Test Design

  • Number of Transect Lines – Select 3-6 lines for representative sampling
  • Individual speed tests allow for terrain variation analysis

Default Speed Test

Complete for overall system characterization:

  • Speed Test Distance – Measured distance (typically 15-30m)
  • Speed Test Time – Enter minutes and seconds separately
  • Calculated Speed – Automatic calculation in m/min

Individual Transect Speed Tests

Generate separate speed tests for each transect line:

  • Accounts for terrain variations, soil conditions, and operational factors
  • Provides more accurate uniformity analysis
  • Essential for large fields with varying conditions

Summary Calculations

  • Strip Traverse Time – Time to complete single strip
  • Full Rotation Time – Time to complete all lanes in field
  • Average Speed – Mean of all transect speeds

Pro Tip: Individual transect speeds are crucial for accurate application rate calculations, especially on undulating terrain or varying soil conditions.

Tab 4: Pressure & Flow Analysis

Monitor system hydraulic performance:

Pressure Measurements

  • Pump Discharge Pressure (kPa) – Pressure at pump outlet
  • Machine Inlet Pressure (kPa) – Pressure at machine inlet (Pi)
  • Gun/Sprinkler Pressure (kPa) – Pressure at distribution system (Ps)

Flow Analysis

  • Measured Total Flow (L/s) – Actual system flow rate
  • Design Flow Rate (L/s) – Manufacturer specifications
  • System Pressure Drop – Calculated pressure losses

Measurement Tips:

  • Take pressure readings during steady-state operation
  • Use calibrated digital pressure gauges
  • Record simultaneously with flow measurements
  • Note any pressure fluctuations or irregularities

Tab 5: Energy & Cost Analysis

Calculate operating economics:

Power Consumption

  • Pump Motor Power (kW) – Rated motor power
  • Measured Power Draw (kW) – Actual consumption during operation
  • Electricity Rate ($/kWh) – Local utility rates

Operating Costs

  • Annual Operating Hours – Estimated yearly irrigation time
  • Water Cost ($/m³) – Cost per cubic metre of water
  • Annual Energy Cost – Automatically calculated

Economic Analysis: Understanding operating costs helps justify system improvements and compare different irrigation technologies.

Tab 6: Collector Data

Set up and conduct transverse uniformity testing:

Test Setup Configuration

  • Number of Transect Lines – Set previously in Speed Test tab
  • Collectors per Transect Line – Select 11, 13, 15, 17, 21, or custom
  • Collector Spacing (metres) – Distance between collectors (typically 3-5m)
  • Collector Diameter (mm) – Opening diameter (250mm standard)
  • Test Duration (hours) – Total test time (typically 4-6 hours)

Evaporation Control (Section 5.2.2)

Essential for accurate depth measurements:

  • Control Collector Initial Volume (mL) – Pre-test water volume
  • Control Collector Final Volume (mL) – Post-test remaining volume
  • Control Collector Diameter (mm) – Must match test collectors
  • Collection Start/End Time – Precise timing for evaporation calculation

Data Entry Options

Manual Entry:

  1. Click “Generate Transect Input Fields”
  2. Enter volume and measurement time for each collector
  3. Use “Generate Sample Data” for testing purposes

CSV Upload:

  • Upload file with format: Transect Line, Distance from Centre (m), Volume (mL), Measurement Time (min)
  • Supports files with or without headers
  • Custom collector counts auto-detected
  • Enhanced security validation

Data Quality Tips:

  • Measure all collectors within 30 minutes if possible
  • Record measurement time for each collector
  • Use consistent measurement techniques
  • Note any unusual conditions or disturbances

Tab 7: Results

Calculate and interpret distribution uniformity:

Key Metrics Calculated

  • Distribution Uniformity (DU) – Using Equation 29 with overlap correction
  • Christiansen Uniformity Coefficient (CU) – Using Equation 33
  • Mean Application Depth – With overlap methodology applied
  • Standard Deviation – Measure of variability
  • Coefficient of Variation – Relative variability percentage
  • Low Quarter Mean – Average of lowest 25% of measurements

Individual Transect Results

  • Separate DU calculation for each transect line
  • Identifies spatial variations in performance
  • Helps locate problematic areas

Statistical Analysis

  • Complete statistical summary
  • Minimum and maximum application depths
  • Number of measurements and coverage area

Transverse Profile Charts

  • Application Depth Profile – Shows water distribution pattern
  • Application Rate Profile – Compares rates to soil infiltration
  • Visual identification of uniformity issues

Chart Features:

  • Color-coded transect lines
  • Soil infiltration rate overlay (when applicable)
  • Mean application line reference
  • Centre line identification

Tab 8: Report Generation

Create professional documentation:

Available Report Functions

  • Generate Report – Comprehensive HTML report with methodology
  • Export Data (CSV) – Complete dataset with all calculations
  • Export Charts – PNG images for external use
  • Print Report – Formatted for PDF creation

Report Contents

  • Complete farm and machine information
  • Methodology explanation with overlap correction
  • Key results summary
  • Individual transect analysis
  • Statistical summary
  • Professional recommendations

Understanding Your Results

Distribution Uniformity Classifications

Distribution Uniformity (DU)

  • Excellent: >0.94 (>94%) – Outstanding performance
  • Very Good: 0.87-0.94 (87-94%) – Good commercial performance
  • Good: 0.75-0.87 (75-87%) – Acceptable for most crops
  • Fair: 0.62-0.75 (62-75%) – Marginal performance
  • Poor: 0.50-0.62 (50-62%) – Needs improvement
  • Unacceptable: <0.50 (<50%) – Requires immediate attention

Christiansen Uniformity Coefficient (CU)

  • Excellent: >0.95 (>95%) – Exceptional uniformity
  • Very Good: 0.90-0.95 (90-95%) – Very good performance
  • Good: 0.80-0.90 (80-90%) – Good commercial standard
  • Fair: 0.70-0.80 (70-80%) – Acceptable uniformity
  • Poor: 0.60-0.70 (60-70%) – Below acceptable standards
  • Unacceptable: <0.60 (<60%) – Major uniformity problems

Application Rate Analysis

Soil Infiltration Comparison

  • Green Zone: Application rate ≤ soil infiltration rate
  • Yellow Zone: Application rate 1-2x soil infiltration rate
  • Red Zone: Application rate >2x soil infiltration rate

Interpretation:

  • Green Zone = No runoff expected
  • Yellow Zone = Potential for minor runoff, monitor closely
  • Red Zone = High runoff risk, reduce speed or change nozzles

Overlap Methodology Explained

The calculator uses physically realistic overlap correction:

  1. Outside Collectors – Water volumes transferred to appropriate inside collectors
  2. Inside Collectors – Receive additional water from overlapping patterns
  3. Final Calculations – Based only on inside collectors (within wetted strip)

Why This Matters:

  • Provides realistic field performance assessment
  • Accounts for actual water distribution patterns
  • Eliminates artifacts from traditional calculation methods

Technical Background

Calculation Standards

Based on established irrigation evaluation standards:

Key Equations Used

  • Equation 29: Distribution Uniformity with overlap correction
  • Equation 33: Christiansen Uniformity Coefficient
  • Equation 47: Instantaneous application rate calculation
  • Section 4.5.13.4: Transverse uniformity testing procedures
  • Section 5.2.2: Evaporation correction methodology

Distribution Uniformity Calculation

DU = (Low Quarter Mean / Overall Mean) × 100%

Where:

  • Low Quarter Mean = Average of lowest 25% of measurements
  • Overall Mean = Average of all measurements (inside collectors only)

Christiansen Uniformity Coefficient

CU = (1 - (Σ|xi - x̄|) / (n × x̄)) × 100%

Where:

  • xi = Individual measurement
  • x̄ = Mean of all measurements
  • n = Number of measurements

Application Rate Calculation

Application Rate = (Application Depth / Application Time) × 60

Where application time considers:

  • Machine traverse speed
  • Wetted diameter coverage
  • Specific timing for each transect

Overlap Correction Method

Physical Process

  1. Identify Overlap Zones – Areas receiving water from adjacent strips
  2. Transfer Water Volumes – Outside collector water moved to inside collectors
  3. Apply Evaporation Correction – Account for losses during collection
  4. Calculate Final Depths – Combined water from primary and overlap sources

Advantages Over Traditional Methods

  • Physical Realism – Matches actual field water distribution
  • Eliminates Edge Effects – Removes calculation artifacts
  • Improved Accuracy – Better represents system performance

CSV Data Upload Guide

File Format Requirements

Required Columns (in order)

  1. Transect Line – Integer (1, 2, 3, etc.)
  2. Distance from Centre (m) – Decimal values (positive and negative)
  3. Volume (mL) – Measured collector volume
  4. Measurement Time (min) – Time for individual measurement

Example CSV Format

Transect Line,Distance from Centre (m),Volume (mL),Measurement Time (min)
1,-15.0,125.5,5.2
1,-10.0,145.2,5.0
1,-5.0,165.8,4.8
1,0.0,180.0,5.1
1,5.0,170.5,5.3
2,-15.0,130.2,5.1

File Requirements

  • Format: CSV (.csv extension)
  • Size Limit: 5MB maximum
  • Headers: Optional (auto-detected)
  • Encoding: UTF-8 recommended

Upload Process

  1. Prepare CSV File – Ensure proper format and validation
  2. Select File – Use file browser to choose CSV
  3. Upload – Click “Upload CSV Data” button
  4. Validation – System checks format and data quality
  5. Population – Data automatically fills input fields
  6. Verification – Review populated data for accuracy

Common Upload Issues

File Format Problems

  • Solution: Ensure .csv extension and proper comma separation
  • Check: Open file in text editor to verify format

Data Validation Errors

  • Transect Lines: Must be integers 1-10
  • Distances: Must be between -100m and +100m
  • Volumes: Must be 0-10,000 mL
  • Times: Must be 0-1440 minutes

Import Mismatches

  • Collector Count: CSV collector count must match setup
  • Spacing: Distance values should match collector spacing
  • Transect Number: CSV transects must match selected count

Troubleshooting

Common Issues and Solutions

Low Distribution Uniformity

Possible Causes:

  • Incorrect operating pressure
  • Worn nozzles or gun components
  • Inappropriate travel speed
  • Poor field setup or alignment
  • Wind effects during testing

Solutions:

  • Check manufacturer pressure recommendations
  • Inspect and replace worn components
  • Adjust travel speed for conditions
  • Verify proper field layout
  • Conduct tests during calm weather

High Application Rates

Causes:

  • Travel speed too fast for conditions
  • Incorrect nozzle selection
  • System pressure too high
  • Mismatched gun/nozzle combination

Solutions:

  • Reduce travel speed
  • Select appropriate nozzle size
  • Adjust operating pressure
  • Consult manufacturer recommendations

Inconsistent Results Between Transects

Causes:

  • Varying travel speeds
  • Uneven terrain effects
  • Wind direction changes
  • Equipment malfunction during test

Solutions:

  • Conduct individual speed tests
  • Account for terrain variations
  • Monitor weather conditions
  • Check equipment operation

CSV Upload Failures

Causes:

  • Incorrect file format
  • Data outside acceptable ranges
  • Security restrictions
  • File size too large

Solutions:

  • Verify CSV format and structure
  • Check data values against limits
  • Try smaller file or different browser
  • Contact system administrator

Data Quality Issues

Negative Volume Readings

  • Cause: Evaporation exceeding collection
  • Solution: Check control collector data, reduce test duration

Extreme Outliers

  • Cause: Measurement errors, collector displacement
  • Solution: Verify suspicious readings, remeasure if necessary

Missing Data Points

  • Cause: Collector loss, measurement oversight
  • Solution: Interpolate if minimal, repeat test if extensive

Best Practices

Field Testing Procedures

Pre-Test Preparation

  • Equipment Check – Verify all collectors are clean and uniform
  • Weather Monitoring – Avoid testing during windy conditions
  • System Inspection – Check gun, nozzles, and pressure systems
  • Layout Survey – Precisely measure collector positions

During Testing

  • Consistent Timing – Start and stop collection simultaneously
  • Regular Monitoring – Check system operation throughout test
  • Data Recording – Document any unusual conditions
  • Safety Procedures – Maintain safe distances from operating equipment

Post-Test Analysis

  • Prompt Measurement – Measure collectors as quickly as possible
  • Data Verification – Check for obvious errors or outliers
  • Documentation – Record all test conditions and observations
  • Result Interpretation – Consider results in context of field conditions

Optimization Strategies

Improving Distribution Uniformity

Pressure Management:

  • Maintain manufacturer recommended pressures
  • Avoid excessive pressure that reduces pattern quality
  • Check for pressure fluctuations during operation

Speed Optimization:

  • Balance application depth with infiltration rate
  • Consider soil conditions and slope
  • Adjust for wind effects and evaporation

System Maintenance:

  • Regular nozzle inspection and replacement
  • Proper gun alignment and leveling
  • Hose and reel maintenance

Economic Optimization

Energy Efficiency:

  • Match pump size to system requirements
  • Optimize operating pressures
  • Consider variable frequency drives

Water Use Efficiency:

  • Minimize over-application through better uniformity
  • Reduce runoff through appropriate application rates
  • Time irrigation to minimize evaporation losses

Seasonal Considerations

Wind Effects

  • Spring/Fall – Often more challenging conditions
  • Summer – Generally calmer, but higher evaporation
  • Morning vs. Evening – Consider local wind patterns

Crop Stage

  • Early Season – Lower application rates acceptable
  • Mid-Season – Peak uniformity requirements
  • Late Season – May accept lower uniformity

Soil Conditions

  • Wet Soil – Lower infiltration rates, runoff risk
  • Dry Soil – Higher infiltration, crusting potential
  • Frozen Soil – Winter testing limitations

Professional Standards

Industry Benchmarks

Acceptable Performance Levels

Commercial Agriculture:

  • Minimum DU: 0.75 (75%)
  • Target DU: 0.85+ (85%+)
  • Minimum CU: 0.80 (80%)
  • Target CU: 0.90+ (90%+)

High-Value Crops:

  • Minimum DU: 0.85 (85%)
  • Target DU: 0.90+ (90%+)
  • Minimum CU: 0.85 (85%)
  • Target CU: 0.95+ (95%+)

Research Applications:

  • Minimum DU: 0.90 (90%)
  • Target DU: 0.95+ (95%+)
  • Minimum CU: 0.90 (90%)
  • Target CU: 0.98+ (98%+)

Regulatory Compliance

Water Use Efficiency Standards

Many regions require minimum efficiency standards:

  • Water conservation programs
  • Environmental regulations
  • Irrigation district requirements
  • Grant program compliance

Documentation Requirements

Professional evaluations should include:

  • Complete methodology documentation
  • Quality assurance procedures
  • Statistical analysis results
  • Professional recommendations

Certification and Training

Professional Development

  • Irrigation evaluation certification programs
  • Equipment manufacturer training
  • University extension courses
  • Professional association memberships

Continuing Education

  • New technology updates
  • Regulation changes
  • Research developments
  • Best practice evolution

Support and Resources

For technical support or questions about this calculator:

  • Plugin Author: Dan Bloomer / LandWISE
  • Website: https://www.landwise.org.nz
  • Standards Reference: Irrigation System Evaluation Code of Practice (Section 4.5)

Additional Resources

  • Manufacturer technical specifications
  • University extension publications
  • Professional irrigation associations
  • Local agricultural advisors

Document Version: 0.0.8
Last Updated: 2024
Compatibility: WordPress 5.0+ | PHP 7.4+

This user guide provides comprehensive instructions for professional travelling irrigation system evaluation. Always verify measurements and consult qualified professionals for critical irrigation decisions. The overlap methodology used in this calculator provides physically realistic results that account for actual field water distribution patterns.