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Water Efficiency Formula:
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Water efficiency calculation for new dwellings is a requirement under UK government regulations. It helps determine the total water consumption per person per day to ensure sustainable water usage in residential buildings.
The calculator uses the water efficiency formula:
Where:
Explanation: The equation calculates total water efficiency by summing fixture consumption and adding a standard 5 l/person/day allowance as per UK government guidelines.
Details: Calculating water efficiency is crucial for sustainable building design, compliance with UK building regulations, and reducing environmental impact through responsible water usage.
Tips: Enter the total fixture water consumption in liters per person per day. The value must be a valid non-negative number.
Q1: What is the purpose of the +5 l/person/day allowance?
A: This additional allowance accounts for miscellaneous water usage not covered by standard fixture calculations, ensuring realistic water efficiency assessments.
Q2: What are typical water efficiency targets?
A: UK building regulations typically target 125 l/person/day or less for new dwellings, though specific requirements may vary by local authority.
Q3: What fixtures are included in the calculation?
A: All water-using fixtures including toilets, showers, baths, taps, and appliances should be included in the fixture consumption calculation.
Q4: Is this calculator applicable to all UK regions?
A: While based on UK government guidelines, specific requirements may vary slightly between England, Wales, Scotland, and Northern Ireland.
Q5: How often should water efficiency be calculated?
A: Water efficiency calculations should be performed during the design phase of new dwellings and verified upon completion to ensure compliance.