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🌾 Centre Pivot Irrigation Evaluation Calculator v1.0.2
Supporting the Irrigation System Evaluation Code of Practice - Section 4.7
Professional Analysis with Enhanced Security & Reporting
🏡 Farm & Property Information
👨🔬 Consultant & Evaluation Details
🚜 Centre Pivot Equipment Information
75% of full end gun throw radius (leave blank if no end gun)
Machine length + 75% of end gun wetted radius
Diameter of individual sprinkler wetted pattern
Desired irrigation application depth
π × (effective radius)² ÷ 10,000
🌱 Soil Information
Basic infiltration rate of soil
⚡ Centre Pivot Speed Testing
Distance measured for speed test (usually 15-30m)
Time taken to travel test distance
Distance from pivot centre where speed was measured
Speed = Distance ÷ (Time ÷ 60)
Time for complete 360° revolution
📊 System Pressure & Flow Analysis
Pressure at pump discharge
Manufacturer's specified operating pressure
Pressure at the end tower
Actual measured flow rate
Manufacturer's specified flow rate
Will calculate automatically
⚡ Energy Consumption & Operating Costs
Rated power of main irrigation pump motor
Actual power consumption during operation
Cost per kilowatt-hour of electricity
Estimated annual irrigation hours
Cost per cubic metre of irrigation water
Will calculate automatically
💧 Radial Collector Test Setup
Enter a custom number between 10 and 200
Diameter of catch can opening
Duration of radial uniformity test
Distance from pivot centre to first collector
Distance from pivot centre to last collector
🌡️ Evaporation Control (Section 5.2.2)
Volume added to control collector before test
Volume remaining in control collector after test
Diameter of control collector opening
When water application to collectors began
When measurement of collectors was completed
Will calculate from control collector data
📄 Upload Collector Data from CSV
Upload a CSV file with collector data. Supported formats:
- 4 columns: Collector Number, Distance (m), Volume (mL), Collection Time (minutes)
- 3 columns: Distance (m), Volume (mL), Collection Time (minutes)
CSV files with or without headers are supported
Select number of collectors above to generate input fields
📊 Centre Pivot Distribution Uniformity Analysis v1.0.2
Complete the collector data entry and calculate results to see analysis here.
Key Calculations (Code of Practice Section 4.7):
- Radial Distribution Uniformity (DUlq) using distance adjustment (Eq 31)
- Heermann-Hein Uniformity Coefficient (HHUC) evaluation
- Application depth using correct unit conversions (Eq 43)
- System application depth with proper unit conversions
- Application rates calculated using centre pivot kinematics
- Evaporation correction (Section 5.2.2)
- Statistical analysis including standard deviation and coefficient of variation
- Pressure variation analysis
- Energy efficiency calculations
📋 Professional Report Generation
📋 Report Features v1.0.2
- Generate Report: Professional report with all calculations and interpretations
- Export Data: CSV file with all collector data and results
- Export Charts: PNG images of application depth and rate profile charts
- Print Report: Professional HTML report optimised for PDF printing
Developed for LandWISE by Dan Bloomer, Page Bloomer Associates