1. What is the Water Efficiency Calculator?

The Water Efficiency Calculator calculates liters per person per day (lppd) according to UK government standards. It helps assess water usage efficiency in buildings and properties.

2. How Does the Calculator Work?

The calculator uses the water efficiency formula:

Where:

• \( F_i \) — Number of fittings of type i
• \( U_i \) — Usage rate of fitting i (l/day)
• \( O \) — Occupancy (number of persons)

Explanation: The equation calculates water consumption per person per day by summing the water usage from all fittings and dividing by the number of occupants.

3. Importance of Water Efficiency Calculation

Details: Water efficiency calculation is crucial for sustainable building design, compliance with UK building regulations, and reducing environmental impact through optimized water usage.

4. Using the Calculator

Tips: Enter the number of fittings, daily usage rate per fitting in liters, and the number of occupants. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is considered good water efficiency?
A: According to UK standards, a lppd value below 125 is considered good water efficiency for new dwellings.

Q2: How do I determine usage rates for different fittings?
A: Usage rates can be found in manufacturer specifications or use standard values from UK Water Efficiency Calculator for new dwellings.

Q3: Does this calculator account for different types of fittings?
A: The calculator uses a generalized approach. For detailed calculations with multiple fitting types, specialized software may be required.

Q4: Is this calculator applicable to commercial buildings?
A: While the principle is similar, commercial buildings may require different calculation methods and standards.

Q5: How often should water efficiency be calculated?
A: Water efficiency should be calculated during building design and periodically monitored during operation to ensure continued compliance.