Our Water Consumption services
Whole House Potable Water Consumption Calculations
Assessment Procedure
Appendix A of Building Regulations Approved Document G sets out a calculation methodology for assessing the whole house potable water consumption in new dwellings.
This methodology was also previously used to assess water consumption under the Code for Sustainable Homes ‘WAT2’ category
Technical Competence
Whilst there is no accreditation scheme currently associated with the above calculation method our assessors have previously been accredited with Stroma Certification under the now withdrawn Code for Sustainable Homes scheme.
Building Regulations
To comply with current Building Regulations Approved Document G2, potable water consumption must be no worse that 125 lpppd in addition to this, depending on certain planning conditions there is an optional requirement to achieve a lower water consumption rate of 110 litres per person per day.
Calculation Procedure
The calculation takes into account all means of water consumption including sink and basin taps, toilets, baths, Washing Machine, Dishwasher, Water Softener and Waste Disposal Unit and makes an allowance for external water use. Consumption may be offset by water saving or recycling devices.
Assessment Preparation
To accurately produce the “WAT 2 ” calculation it will be necessary to obtain the following information:
Flow rate (@3bar) of all varieties of sink and basin taps, flush capacity of toilets (which may be single or dual) capacity of each bath, flow rate (@3bar) of all varieties of shower head, specifications for washing machine, dishwasher, water softener or waste disposal unit that will be installed by the developer Details of any rainwater or grey water recycling devices installed or provision for them.
