1. What is a Nozzle Inches per Hour Calculator?

Definition: This calculator determines the precipitation rate (in inches per hour) for irrigation nozzles based on flow rate and coverage area.

Purpose: It helps irrigation professionals and landscapers design efficient watering systems by calculating how quickly water is applied.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( I \) — Precipitation rate (inches per hour)
• \( Q \) — Flow rate (gallons per hour)
• \( A \) — Area covered (square feet)

Explanation: The flow rate is divided by the area to determine how many inches of water would accumulate per hour if all water stayed in place.

3. Importance of Precipitation Rate Calculation

Details: Proper precipitation rate calculation ensures uniform water distribution, prevents runoff, and helps match application rates to soil absorption rates.

4. Using the Calculator

Tips: Enter the nozzle flow rate in GPH and the area covered in square feet. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical precipitation rate for sprinklers?
A: Most spray heads deliver 1.5-2.0 in/h, while rotors typically apply 0.4-0.6 in/h.

Q2: How do I find my nozzle's flow rate?
A: Check manufacturer specifications or measure output with a flow meter.

Q3: Why is area in square feet when we measure in inches?
A: The formula converts gallons (volume) to inches (depth) over the given area.

Q4: How does this relate to irrigation runtime?
A: Divide your desired watering depth (inches) by precipitation rate to determine runtime (hours).

Q5: Should precipitation rate match soil intake rate?
A: Ideally, yes. If precipitation exceeds intake, you'll get runoff and need to cycle irrigation.