1. What is Landscape Water Demand?

The Landscape Water Demand calculation estimates the amount of water needed to maintain healthy plants based on local climate conditions (ET0), landscape area, plant type (PF), and irrigation system efficiency.

2. How Does the Calculator Work?

The calculator uses the water demand equation:

Where:

• \( ET0 \) — Reference evapotranspiration (inches)
• \( Area \) — Landscape area (square feet)
• \( PF \) — Plant factor (0-1)
• \( Efficiency \) — Irrigation system efficiency (0-1)

Explanation: The equation accounts for water lost through evapotranspiration, adjusted for plant type and irrigation efficiency.

3. Importance of Water Demand Calculation

Details: Accurate water demand estimation is crucial for sustainable landscaping, water conservation, and compliance with local water regulations in Santa Monica.

4. Using the Calculator

Tips: Enter ET0 values from local weather data, measure your landscape area accurately, select appropriate plant factors (0.1-0.3 for low water use plants, 0.4-0.6 for moderate, 0.7-0.9 for high water use), and estimate your irrigation system efficiency (0.75 for drip, 0.65 for spray).

5. Frequently Asked Questions (FAQ)

Q1: Where can I find ET0 values for Santa Monica?
A: Check with the Santa Monica Public Works Department or local weather stations for monthly ET0 data.

Q2: What are typical plant factors for common landscape plants?
A: Native plants: 0.1-0.3, Drought-tolerant shrubs: 0.4-0.6, Turf grass: 0.7-0.9.

Q3: How can I improve irrigation efficiency?
A: Use drip irrigation, maintain your system regularly, water during cooler hours, and use smart controllers.

Q4: Does this account for rainfall?
A: No, this calculates gross water demand. Effective rainfall should be subtracted for net irrigation requirement.

Q5: Is this calculator specific to Santa Monica?
A: While the equation is universal, the calculator is optimized for Santa Monica's climate and water regulations.