Important

This calculator gives a starting point for irrigation volume and runtime. Actual needs vary with canopy, root zone, drainage, irrigation method, heat, wind, and sun. Check long runs in the field.

Orchard Irrigation Runtime Calculator

Q: "Can I use it without a target water amount?"

"Yes. Leave target water blank and the calculator uses the reference midpoint built from tree age, spacing, and soil."

Q: "Does tree spacing mean row spacing?"

"In this calculator, tree spacing means the distance to the next tree in the same row. It does not calculate row spacing area."

Q: "Does it use weather data or ET?"

"No. It is designed to stay practical by using only tree structure and dripper flow."

Q: "Can I switch between metric and US units?"

"Yes. You can switch between m / ft, L / gal, and L/h / gal/h."

Build a reference per-tree water amount from tree age, spacing, and soil, then calculate one irrigation runtime from dripper flow and count.

Because the model does not depend on local weather data, the same logic works in any region.

Uses the reference midpoint automatically Switches between metric and US units Keeps share URLs and the last state Calculates entirely in the browser

Calculate irrigation volume and runtime

Even when target water is blank, you can estimate runtime from the reference midpoint.
Enter a target water amount to recalculate runtime from that exact value.

How to use

Enter tree age, spacing, soil type, dripper flow, and dripper count.
Review the reference range and enter a target water amount if needed. Leave it blank to use the reference midpoint.
Check the runtime, per-dripper water, and total flow.
Copy the result or copy the share URL for use in the field.

Examples

Use a manual target water amount for a 5-year orchard tree

Input 5 years old, 4.0 m spacing, loam soil, 24 L/tree target water, 2.0 L/h dripper flow, 4 emitters

Output Reference water 22 - 33 L/tree, runtime 3h00m, per-dripper water 6.0 L

Leave target water blank to use the reference midpoint

Input 12 years old, 18 ft spacing, clay soil, target blank, 0.5 gal/h dripper flow, 6 emitters

Output The reference midpoint is used automatically, runtime 5h54m, within the reference range

Glossary

Tree age

Years since planting. It anchors the reference curve.

Tree spacing

Distance to the next tree in the same row.

Soil type

A simple way to express water retention and drainage differences.

Dripper

One emitter outlet with a known flow rate.

Reference water

The starting water amount built from age, spacing, and soil.

Runtime

The time you run the irrigation line for one watering event.

Formulas

Reference midpoint = age-based water × spacing factor × soil factor
Reference range = midpoint × 0.8 to 1.2
Total flow = dripper flow × count
Runtime = target water ÷ total flow
Per-dripper water = target water ÷ dripper count

How the reference water is built

Start from tree age, then nudge it with spacing and soil. No weather data required.

Age anchors

Age	Base water	Reference spacing
0	3 L/tree	2.0 m
1	6 L/tree	2.2 m
3	15 L/tree	3.0 m
6	30 L/tree	4.0 m
10	50 L/tree	5.0 m
15	75 L/tree	6.0 m

Adjustment factors

Group	Condition	Factor
Soil	Sandy soil	0.90
Soil	Loam	1.00
Soil	Clay soil	1.10
Spacing	Below 85% of reference	0.85
Spacing	On the reference curve	1.00
Spacing	Above 120% of reference	1.20

The spacing factor is clamped to 0.85-1.20, and the tool warns when the value drifts outside the reference curve.

How to read soil type

Sandy soil usually works better with shorter runs and more frequent cycles.
Loam is the baseline for this calculator, so the midpoint is easiest to read there.
Clay soil can pond easily, so watch infiltration and avoid overfilling.

How to keep it region-neutral

The model does not use weather data, so the same logic can be used across regions.
If canopy, pruning, root zone, or drainage differ a lot, fine-tune the target water with field observation.
Start from the structure, then tune it in the field. That keeps the workflow simple.

Frequently asked questions

Can I use it without a target water amount?

Yes. Leave target water blank and the calculator uses the reference midpoint built from tree age, spacing, and soil.

Does tree spacing mean row spacing?

In this calculator, tree spacing means the distance to the next tree in the same row. It does not calculate row spacing area.

Does it use weather data or ET?

No. It is designed to stay practical by using only tree structure and dripper flow.

Can I switch between metric and US units?

Yes. You can switch between m / ft, L / gal, and L/h / gal/h.

Notice

This result is a guide. Canopy, pruning, root zone, drainage, heat, wind, sun, and irrigation method all change the best value.
In sandy soil, shorter runs and more frequent cycles are often safer. In clay, watch for ponding and slow infiltration.
If a manual target water amount sits far outside the reference range, check tree age and spacing again.