(Building Research Establishment Environmental Assessment Methodology)
BREEAM is the leading and most widely used environmental assessment method for buildings. It is the set standard for best practice in sustainable design and has become the ‘DeFacto’ measure used to describe a buildings environmental performance. BREEAM assesses buildings against a set criteria and provides an overall score which will fall within a band providing either a Pass, Good , Very Good, Excellent or Outstanding rating.
Water usage is part of the assessment and water efficiency levels are achieved by improving water usage from a set baseline. The attached sheet shows table 8-1 which shows the baseline for water usage dependant on the component type as set by BREEAM, and the reductions required in order to meet the various levels.
As part of our continued work to minimise the impact on the environment we have a range of flow restricting aerators and flow restrictors to further control our product’s water conservation. We offer various valve and restrictor options enabling the specifier to select the combination most suitable for the purpose, making it far easier to meet the requirements for the desired BREEAM level.
Checklists and Tables
Table - 18 outlines the standards, by component type, used to define the performance levels set in BREEAM. These defined levels of efficiency have been steered by a range of published sources of information and therefore reflect robust levels of typical, good, best and exemplary practice.
Table - 18: Water efficient consumption levels by component type.
|WC||6||5||4.5||4||3.75||3||Effective flush volume (litres)|
|Wash hand basin taps||12||9||7.50||4.50||3.75||3||litres/min|
(2 or more urinals)
(1 urinal only)
|0||0||0||0,25||0,5||0,75||% of WC/urinal flushing demand met
using recycled non potable water
|Kitchen tap: kitchenette||12||10||7.50||5||5||5||litres/min|
|Kitchen taps: restaurant
(pre-rinse nozzles only)
|Domestic sized washing machines||90||60||50||40||35||30||litres/use|
|Waste disposal unit||17||17||0||0||0||0||litres/min|
Industrial sized wash- ing machines
Please note that specifying components for a building in accordance with the above levels will result, in most cases, in the corresponding number of BREEAM credits being achieved. However, please bear in mind that the component specifications above are thresholds between each level. Therefore caution should be taken when defining a component specification for a BREEAM assessed building using exactly the same levels as the threshold levels. It is recommended that, where Wat 01 BREEAM credits are being targeted, the performance of a particular building’s component specification is verified using the BREEAM Wat 01 calculator before committing to a particular specification and ordering/installing components. This will provide greater assurance that the component specification achieves the targeted number of BREEAM credits.
As the methodology and BREEAM credits for water efficiency compare the buildings modelled water consumption performance against the performance of a baseline specification for the same component types, where a component type is not specified it is not accounted for in the methodology i.e. the component is excluded from both the proposed and baseline building. Therefore no benefit is gained in terms of BREEAM performance, which is the % improvement over the baseline building, by deciding not to specify a particular component. However, the methodology will reflect the reduction in overall water consumption (litres/person/day) for the building, as a result of not specifying a particular component.