IRRIG8: Pressure and energy

This calibration tool is designed to meet the IrrigationNZ: NZ Irrigation System Performance Assessment Code of Practice – Part I: Conducting Energy Efficiency Assessments and Seasonal Irrigation Efficiency. Download the code for more guidance.

NOTE: IRRIG8 does not store your data or keep any records. Leaving or refreshing this page will delete all your data, so print reports and export the data or graphs if you want to save them. To have a copy you can reload and edit, download the Save Session csv file and save it. This tool lets you upload it again to automatically repopulate all your data.

Beta version: See disclaimer at foot of page

⚡ Pump & Delivery Energy Assessment v1.0.0

Pump efficiency and delivery system efficiency following the IrrigationNZ Code of Practice Part I, Section 1

💾 Save or Reload an Assessment

Save everything entered on all tabs, plus the results, to a CSV file on your computer. Load it later to fill the tool back in and recalculate.

Files stay on your computer; nothing is uploaded to the website. Loading replaces what is currently entered.
🏡 Farm & Property Information
🖼️ Report Branding (Optional)
JPG, PNG or GIF, max 500KB
⚡ Pump and Power Unit
Code Table 1.1: submersibles under 55 kW run 3–5% higher, turbines 5–10% higher
Nameplate rating; sets the typical efficiency range
Time between the meter readings (same period for power and water)
Energy Used During the Test
Usually 1; check the meter or the power company
Measure by refilling to the same mark
Leave blank for the Code value: diesel 3.75 (3.5–4.0), petrol 2.65 (2.5–2.8)
Use instead of meter readings, e.g. from a power analyser
From the motor nameplate; gives an estimate of pump-only efficiency
Leave blank to use the middle of the Code Table 1.1 range
💲 Running Costs (Optional)
💧 Water Flow During the Test
Use instead of meter readings, e.g. from an irrigation calibration
⛰️ Elevations (m)

Any common datum (e.g. metres above sea level, or relative to the pump). Work to 0.1 m (about 1 kPa). Water surface is the level while pumping, including drawdown.

📏 Pressures
0 when drawing from open water; positive for a pressurised supply
Suction (vacuum) as a negative value. Optional, but needed for intake losses
After filters, meter and valves
At the irrigator or block entry
🎯 Design & Requirements (Optional)
From the design details
What the irrigator or block needs (end nozzle/emitter requirement plus losses)
🔧 Intake and Mainline

Use internal diameters: measure them or confirm with the supplier. Nominal size is often not the internal diameter, and small diameter errors give large velocity errors.

Between the entry and exit gauges
Hazen–Williams C for the expected friction (a check, not part of the Code method)
Sets the Code maximum mainline velocity

What is calculated

  • Total dynamic head, work done and overall pump efficiency, compared with typical values for the motor size
  • Energy per cubic metre and per hectare-millimetre, and running costs if prices are entered
  • Intake, headworks and mainline friction losses against the Code limits, and the energy they waste
  • Pipe velocities against the Code limits, and where the energy goes
📋 Report

Developed for LandWISE by Dan Bloomer, Page Bloomer Associates