Border Irrigation Calculator
Calculate border strip irrigation volume from strip dimensions and application depth. Determine inflow rate needed for uniform water distribution.
Irrigation System Efficiency Calculator
Calculate overall irrigation system efficiency by multiplying conveyance, distribution, and application efficiencies. Identify where water is lost.
System Presets
%
%
%
ac-in
in/ac
ac
%
Overall Efficiencyโง
61.2%
90% ร 85% ร 80% = 61.2%
Total Water Lossโง
38.8%
Per 100 units diverted, 61.2 reach the root zone
Net Water Deliveredโง
612 ac-in
From 1,000 ac-in gross diverted
Water Wastedโง
388 ac-in
Lost to seepage, evaporation, runoff, deep percolation
Gross Water Neededโง
3,922 ac-in
To meet 24 in/ac crop demand on 100 acres
Weakest Componentโง
Application
At 80% โ improving this gives the greatest overall gain
Water Loss Cascade (per 100 units diverted)
Conveyance Loss10%
Distribution Loss13.5%
Application Loss15.3%
Delivered to Roots61.2%
System Efficiency Rating
61.2% overall
Poor (<40%)Fair (40โ55%)Good (55โ70%)Excellent (>70%)
Improvement Scenarios (+5% each)
| Scenario | New Overall | Gain | Water Saved (ac-in) |
|---|---|---|---|
| Improve Conveyance | 64.6% | +3.4% | 34 |
| Improve Distribution | 64.8% | +3.6% | 36 |
| Improve Application | 65% | +3.8% | 38 |
| Improve All Three | 72.7% | +11.5% | 115 |
Typical Efficiency Ranges by System
| System | Conveyance | Distribution | Application | Overall |
|---|---|---|---|---|
| SDI Drip + Pipeline | 95โ99% | 90โ95% | 88โ95% | 75โ89% |
| Center Pivot + Well | 95โ99% | 85โ92% | 78โ88% | 63โ80% |
| Sprinkler + Lined Canal | 85โ92% | 80โ88% | 70โ82% | 48โ66% |
| Flood + Open Canal | 65โ80% | 70โ82% | 45โ65% | 20โ43% |
Modernization Options
| Improvement | Targets | Typical Gain | Relative Cost |
|---|---|---|---|
| Line / pipe canals | Conveyance | +10โ25% | High |
| Flow measurement | Distribution | +5โ10% | Low |
| SCADA automation | Distribution | +5โ15% | Medium |
| Upgrade nozzles / emitters | Application | +5โ15% | LowโMed |
| Convert flood โ drip | Application | +25โ40% | High |
| Soil moisture sensors | Application | +5โ10% | Low |
Planning notes, formulas, and examples
About the Irrigation System Efficiency Calculator
Overall irrigation system efficiency measures what fraction of water diverted from the source actually reaches the crop's root zone. It is the product of three component efficiencies: conveyance (canal or pipeline losses), distribution (on-farm delivery uniformity), and application (field-level losses to evaporation, runoff, and deep percolation).
A system with 90% conveyance, 85% distribution, and 80% application efficiency has an overall efficiency of only 61%. Each component compounds losses, making it essential to identify and address the weakest link.
This calculator breaks down the three components and shows the overall efficiency plus the total water lost per 100 units diverted, helping you prioritize improvements. Use it to see whether losses are mostly in conveyance, distribution, or application before spending money on upgrades.
When This Page Helps
Knowing where water is lost lets you invest in improvements where they matter most. This page helps you separate conveyance, distribution, and application losses so upgrades target the biggest leak first.
How to Use the Inputs
- Enter the conveyance efficiency as a percentage.
- Enter the distribution efficiency as a percentage.
- Enter the application efficiency as a percentage.
- Read the overall system efficiency.
- Review the water loss at each stage.
- Identify the weakest component for improvement.
Formula used
Overall Efficiency (%) = (E_conv / 100) ร (E_dist / 100) ร (E_app / 100) ร 100
Water Delivered per 100 Diverted = Overall Efficiency
Total Loss = 100 โ Overall EfficiencyExample Calculation
Result: Overall Efficiency = 61.2%
(0.90 ร 0.85 ร 0.80) ร 100 = 61.2%. Of every 100 gallons diverted, only 61 reach the root zone. 10 are lost in conveyance, another 5.4 in distribution, and 23.4 in application.
Tips & Best Practices
- Piped conveyance has 95โ99% efficiency; open canals 70โ90%.
- Distribution uniformity depends on system design and maintenance.
- Application efficiency varies widely by method: drip 90โ95%, pivot 78โ88%, flood 45โ65%.
- Improving the lowest-efficiency component gives the biggest overall gain.
- Lining earthen canals with concrete or plastic can save 10โ20% in conveyance.
- Annual maintenance (fixing leaks, cleaning filters) preserves efficiency.
Benchmarking Your System
Compare your overall efficiency against regional benchmarks. District-level data is often available from USDA NRCS or state water agencies. If your efficiency is below the benchmark, investigate each component to find the gap.
The Cost of Inefficiency
Every percentage point of lost efficiency has a dollar cost: wasted energy for pumping, wasted water against your allocation, and potentially lower yields from non-uniform application. Even a 5% improvement in a 60% system saves significant water and money over a season.
Modernization Options
Lining canals, installing pipeline, adding flow measurement, upgrading from flood to sprinkler or drip, and automating scheduling are all modernization strategies. Each addresses a different efficiency component. A system audit identifies which investments give the best return.
Sources & Methodology
Last updated:
Frequently Asked Questions
Conveyance efficiency is the fraction of water diverted from the source that reaches the farm gate. Losses occur through canal seepage, evaporation, and operational spills. Piped systems have higher conveyance efficiency than open canals.
Distribution efficiency measures how uniformly water is shared among fields in a delivery network. It accounts for measurement errors, scheduling inefficiencies, and unequal delivery to different farm turnouts.
Application efficiency is the fraction of water applied to the field that is stored in the root zone for crop use. It accounts for evaporation, wind drift (sprinklers), runoff, and deep percolation below the root zone.
Modern pressurized systems (drip, pivot) can achieve 70โ85% overall. Traditional surface systems with unlined canals may be only 30โ45% overall. Improving any component raises the product significantly.
Conveyance: measure flow at the source and at the farm gate. Distribution: compare deliveries across multiple outlets. Application: catch-can test or soil moisture measurements before and after irrigation.
Yes, mathematically improving any factor increases the product. But the cost-effectiveness varies. Focus on the component with the most room for improvement at the lowest cost.
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