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Wat 02 Water monitoring

(all buildings)

Number of credits available	Minimum standards
1	Yes (criterion 1 only)

Aim

To ensure water consumption can be monitored and managed, and therefore encourage reductions in consumption.

Assessment criteria

The following is required to demonstrate compliance:

One credit

The specification of a water meter on the mains water supply to each building; this includes instances where water is supplied via a borehole or other private source.

Water-consuming plant or building areas, consuming 10% or more of the building's total water demand, are either fitted with easily accessible sub-meters or have water monitoring equipment integral to the plant or area (see Compliance notes).

Each meter (main and sub) has a pulsed or other open protocol communication output to enable connection to an appropriate utility monitoring and management system, e.g. a building management system (BMS), for the monitoring of water consumption (see Relevant definitions).

If the site on which the building is located has an existing BMS, managed by the same occupier or owner (as the new building), the pulsed or digital water meters for the new building must be connected to the existing BMS (see Relevant definitions).

Checklists and tables

None.

Compliance notes

Ref	Terms	Description
Shell and core (non-residential and residential institutions only)
CN1	Applicable assessment criteria	Criteria 1 , 3 and 4 Both options: All criteria relevant to the building type and function apply. Criterion 2 Shell only: This criterion is not applicable Shell and core: This criterion is applicable. Refer to Appendix D – Shell and core project assessments for a more detailed description of the shell and core assessment options.
CN1.1	Shell and core assessments	Shell and core Compliance with criterion 2 must be demonstrated for water-consuming plant or building areas identifiable by the developer (see Relevant definitions). Water-consuming plant or building areas to be added or installed by the tenant do not need to be assessed for this issue.
Residential - Partially fitted and fully fitted
CN2	Applicable assessment criteria - Single dwellings	Both options: Criterion 1 is applicable only Refer to Appendix E – Applicability of BREEAM New Construction to single and multiple dwellings, partially and fully fitted for a more detailed description of residential assessment options.
CN2.1	Applicable assessment criteria - Multiple dwellings	Both options: All criteria relevant to the building type and function apply. Refer to Appendix E – Applicability of BREEAM New Construction to single and multiple dwellings, partially and fully fitted for a more detailed description of residential assessment options.
CN2.2	Utility company water monitoring equipment	Water meters installed by a water utility company that provide the future homeowner or tenant with accurate and regular water usage information per dwelling will comply with this issue.
General
CN3	Water-consuming plant or building area. See criterion 2 .	As a minimum, this includes the following (where present): Buildings with a swimming pool and its associated changing facilities (toilets, showers etc.) On sites with multiple units or buildings, e.g. shopping centres, apartment blocks, industrial units, retail parks etc. separate sub-meters are fitted on the water supply to the following areas (where present): Each individual unit supplied with water (for residential institutions with self-contained dwellings, each dwelling) Common areas (covering the supply to toilet blocks) Service areas (covering the supply to outlets within storage, delivery, waste disposal areas etc.) Ancillary or separate buildings to the main development with a water supply Laboratory: in any building with a laboratory (or containing laboratories), a separate water meter is fitted on the water supply to any process or cooling loop for plumbed-in laboratory process equipment.
CN3.1	10% of water demand. See criterion 2 .	The sub-meter requirement does not necessarily apply in the following cases, where the assessor confirms there will be no additional monitoring benefit resulting from their installation: Where a building has only one or two small sources of water demand (e.g. an office with sanitary fittings and a small kitchen) Where the building has two sources of water demand, one significantly larger than the other, and the water consumption for the larger demand is likely to mask the smaller demand.
CN3.2	Extensions to existing buildings. See criterion 4 .	If no new water supply is being installed because the occupants of the extended building will use the facilities in, and therefore water supply to the existing building, then the following must be provided in the existing building: A water meter for the mains water supply Sub-meters for large water-consuming plant or facilities, e.g. evaporative cooling, swimming pool etc. (where present). The meters provided must have a pulsed output or connection to the existing BMS in accordance with the assessment criteria.
CN3.3	No water supply to the building or unit	If there is no installed water supply to the assessed building because there will be no water-consuming fittings in the building, then in such instances the guidance given in the above compliance note for extensions to existing buildings applies.

Methodology

None.

Evidence

Criteria	Interim design stage	Final Post-construction stage
All	The relevant sections or clauses of the building specification or contract. Design drawings.	BREEAM Assessor’s site inspection report and photographic evidence OR As-built drawings.

Criteria

Interim design stage

Final Post-construction stage

All

The relevant sections or clauses of the building specification or contract.

Design drawings.

BREEAM Assessor’s site inspection report and photographic evidence OR

As-built drawings.

Additional information

Relevant definitions

Staff areas: Refer to BREEAM issue Hea 01 Visual comfort – Relevant definitions.

Meter outputs: Examples include pulsed outputs and other open protocol communication outputs, such as Modbus.
Utility monitoring and management system: Examples include automatic meter reading systems (AMR) and building energy management systems (BEMs). Automatic monitoring and targeting (AM&T) is an example of a management tool that includes automatic meter reading and data management.

Other information

None.