1. What is Part G Water Efficiency Calculation?

The Part G Water Efficiency calculation determines the liters per person per day (lppd) water consumption based on the number of fittings, their usage rates, and occupancy. This helps assess compliance with building regulations for water efficiency.

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)
• \( lppd \) — Liters per person per day

Explanation: The equation calculates daily water consumption per person by multiplying the number of fittings by their usage rate, then dividing by the number of occupants.

3. Importance of Water Efficiency Calculation

Details: Water efficiency calculations are crucial for sustainable building design, regulatory compliance, and reducing environmental impact while ensuring adequate water supply for occupants.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What types of fittings should be included?
A: Include all water-consuming fixtures such as taps, showers, toilets, and appliances that use water.

Q2: How is usage rate determined?
A: Usage rates are typically based on manufacturer specifications or standard values from water efficiency guidelines.

Q3: What is a good lppd value?
A: This varies by region, but typically values below 125 lppd are considered efficient, with best practice below 110 lppd.

Q4: Does this calculation account for outdoor water use?
A: Typically, Part G calculations focus on indoor water use. Outdoor water use may need separate calculation.

Q5: How often should this calculation be performed?
A: This should be done during building design and whenever water fittings are added or modified.