1. What is Water Efficiency Calculation?

The Water Efficiency Calculation assesses water consumption per person per day according to Part G of the Building Regulations. It ensures that new developments meet sustainable water usage standards.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Fixture Consumption \) — Total water consumption from all fixtures (l/person/day)
• \( 5 \) — Fixed external water usage allowance (l/person/day)

Explanation: The calculation sums all internal fixture consumption and adds a fixed external usage allowance to determine total water efficiency.

3. Importance of Part G Compliance

Details: Part G Building Regulations require that the calculated water consumption does not exceed 125 liters per person per day. This promotes water conservation and sustainable development practices.

4. Using the Calculator

Tips: Enter the total fixture consumption in liters per person per day. The calculator will add the external usage allowance and check compliance with Part G regulations.

5. Frequently Asked Questions (FAQ)

Q1: What is included in fixture consumption?
A: Fixture consumption includes water usage from toilets, showers, baths, taps, and other water-using appliances within the building.

Q2: Why is there a 5 l/person/day external allowance?
A: This accounts for external water usage such as garden irrigation, car washing, and other outdoor water activities.

Q3: What is the maximum allowable water consumption?
A: The total water consumption must not exceed 125 liters per person per day to comply with Part G Building Regulations.

Q4: How is fixture consumption calculated?
A: Fixture consumption is typically calculated by summing the water usage of all fixtures based on their flow rates and usage patterns.

Q5: Does this apply to all types of buildings?
A: Part G regulations primarily apply to new dwellings and major renovations, but water efficiency considerations are important for all building types.