Irrigation Efficiency & From Pump to Root Zone
Measures losses
Combine conveyance, application and distribution efficiencies into one overall irrigation efficiency, then see the net water that reaches the root zone and the water lost on the way.
Irrigation efficiency
Next: aim to lift the weakest stage — here losses leave only 68.4 mm of your 100 mm at the root zone; lining channels or switching to drip raises the overall figure fastest.
Component efficiencies multiply, so the overall is always lower than any single stage. Drip/micro systems push application + distribution into the 90s.
Irrigation efficiency — key facts
- Overall efficiency
- Conveyance × Application × Distribution
- Drip application
- ≈ 90% efficient
- Sprinkler application
- ≈ 75% efficient
- Surface application
- ≈ 50–60% efficient
- Lined vs earthen canal
- ≈ 95% vs <70% conveyance
- Net water
- Pumped × overall efficiency
- Water lost
- Seepage, evaporation, percolation, spread
- Privacy
- Runs in your browser; nothing uploaded
Only a fraction of pumped water reaches the crop
Water leaks away at every step between the source and the plant. Some seeps through the walls of an unlined canal, some evaporates in flight from a sprinkler, some drains below the roots, and some lands on parts of the field the crop never uses. Overall irrigation efficiency is the product of three stage efficiencies — conveyance, application and distribution — and it tells you what share of the water you paid to move actually does the job.
This tool computes your overall irrigation efficiency, the net water reaching the root zone, and the water lost for a given volume pumped. Use it to compare lining a canal, switching to drip, or levelling a field, and to see how small gains at each stage multiply. Pair it with the Drip Water Saving, Canal Seepage Loss and Water Use Efficiency tools to find your cheapest path to more crop per drop.
See the whole chain
Conveyance, application and distribution in one number.
Find the weak link
Spot which stage is leaking the most water.
Quantify the loss
Net water and water lost for what you pump.
Plan the upgrade
Compare lining, drip or levelling before you spend.
Frequently Asked Questions
What is irrigation efficiency?+
Irrigation efficiency is the fraction of the water you pump or divert that actually ends up stored in the crop's root zone, available for the plant to use. The rest is lost on the way — to seepage in canals, evaporation in the air, deep percolation below the roots, and uneven spread across the field.
How is overall irrigation efficiency calculated?+
Overall efficiency is the product of the stage efficiencies: Eo = Conveyance × Application × Distribution. For example a system with 90% conveyance, 80% application and 90% distribution has an overall efficiency of 0.90 × 0.80 × 0.90 ≈ 0.65, meaning only about 65% of pumped water reaches the root zone.
What is conveyance efficiency?+
Conveyance efficiency measures how much water survives the journey from the source to the field — through canals, channels and pipes. Unlined earthen canals lose a lot to seepage (conveyance can fall below 70%), while lined canals and closed pipes keep conveyance efficiency high (often 90–95%).
What is application efficiency?+
Application efficiency is the fraction of water delivered to the field that is actually stored in the root zone, rather than lost to evaporation, runoff or deep percolation. It depends mainly on the method: drip is around 90%, sprinkler around 75% and surface (flood/furrow) often 50–60%.
What is distribution efficiency or uniformity?+
Distribution efficiency (or uniformity) describes how evenly water is spread across the field. If some parts get plenty while others stay dry, you must over-irrigate the wet areas to satisfy the dry ones, wasting water. Good design, level fields and well-maintained emitters keep distribution high.
How much water is lost in a typical system?+
It varies widely. A well-managed drip system with piped supply might lose only 15–20% overall. A surface system on unlined canals can lose more than half its water before it ever benefits the crop. This tool shows your net water and water lost so you can see exactly where you stand.
How can I raise my irrigation efficiency?+
The big levers are lining or piping canals (conveyance), switching to drip or sprinkler (application), levelling fields and maintaining emitters (distribution), and scheduling irrigation to crop demand so you neither under- nor over-apply. Small gains at each stage multiply into a large overall improvement.
Why does efficiency matter for cost?+
Every litre lost is a litre you paid to pump, lift or buy and got nothing for. Low efficiency means higher energy bills, more water drawn from a stressed source, and often waterlogging or salinity from deep percolation. Raising efficiency cuts cost and protects the resource at the same time.
Is higher efficiency always better?+
Mostly, but a little deep percolation can be useful for leaching salts in saline soils, and extremely tight efficiency needs good scheduling to avoid crop stress. The aim is high, well-managed efficiency — delivering the crop's needs reliably with minimal waste — not efficiency for its own sake.