1. What is the Irrigation Water Use Formula?

The irrigation water use formula calculates the amount of water needed for commercial landscape irrigation based on evapotranspiration rates, landscape area, plant factors, and irrigation system efficiency.

2. How Does the Calculator Work?

The calculator uses the water use equation:

Where:

• \( ET \) — Evapotranspiration rate (inches)
• \( Area \) — Landscape area (square feet)
• \( PF \) — Plant factor (0-1, varies by plant type)
• \( IE \) — Irrigation efficiency (0-1, typically 0.7-0.8)

Explanation: The equation accounts for water loss through evapotranspiration, the water needs of different plant types, and the efficiency of the irrigation system.

3. Importance of Water Use Calculation

Details: Accurate water use estimation is crucial for efficient irrigation planning, water conservation, and cost management in commercial properties.

4. Using the Calculator

Tips: Enter ET values from local weather data, measure the exact irrigated area, use appropriate plant factors for your landscape, and know your irrigation system's efficiency.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find ET values for my area?
A: Local agricultural extension services or weather stations typically provide ET data. Many states have online ET networks.

Q2: What are typical plant factor values?
A: Turfgrass: 0.7-0.8, shrubs: 0.5-0.7, trees: 0.2-0.4, native plants: 0.1-0.3.

Q3: What irrigation efficiency should I use?
A: Drip irrigation: 0.85-0.90, rotor sprinklers: 0.70-0.75, spray sprinklers: 0.60-0.70.

Q4: How often should I recalculate water needs?
A: Weekly during growing season as ET changes with weather conditions.

Q5: Does this account for rainfall?
A: No, this calculates gross irrigation requirement. Effective rainfall should be subtracted for net irrigation needs.