1) Water Source & System

Available Pressure (PSI)

Available Flow (GPM)

Units

Backflow ΔPSI

Filter ΔPSI

Regulator Set PSI

Elevation Δ (+up) ft

2) Soil, Plants & Demand

Soil Intake (in/hr)

Peak ETo (in/day)

Crop Coeff. (Kc)

Area (sq ft)

Seasonal Adjust (%)

Cycles (for soak)

3) Emitters & Laterals

Emitter Type

Emitter Rate

gph @ 25 PSI (PC) or nominal

Exponent x (non‑PC)

Emitter Spacing (ft)

Laterals per Zone

Lateral Length (ft)

Lateral Diameter (in)

Pipe Material (C)

Header Length (ft)

Header Diameter (in)

Pressure heatmap legend:

Layout Visualizer

Charts

Results

Zone Flow

—

gpm

Inlet PSI to Laterals

—

Pressure Variation

—

Keep < 20%

Recommended Zones

—

Based on available GPM

Runtime & Schedule

PR (in/hr)

—

Minutes per Cycle

—

Zone	Flow (gpm)	PR (in/hr)	Min/Cycle	Cycles	Water/day (gal)

Bill of Materials (BOM)

Item	Spec	Qty	Notes

Red flags:

Quick Tips

Keep pressure variation along a lateral under 20% (10% is great).
Header velocity under ~5 ft/s helps avoid water hammer.
Cycle & soak when soil intake is low or slope is high.
Use pressure-compensating (PC) emitters for longer runs or elevation changes.

Garden & Drip Irrigation Zone Planner

Related Calculators